{"id":763,"date":"2026-09-27T09:20:19","date_gmt":"2026-09-27T09:20:19","guid":{"rendered":"https:\/\/subiapower.com\/transformers\/power-transformer\/"},"modified":"2026-11-12T11:17:35","modified_gmt":"2026-11-12T11:17:35","slug":"power-transformer","status":"publish","type":"page","link":"https:\/\/subiapower.com\/es\/transformers\/power-transformer\/","title":{"rendered":"Transformador de potencia"},"content":{"rendered":"\n<style id=\"subia-oil-template-style\">#subia-oil-template{display:block;width:100%;max-width:none;margin:0;padding:0;background:#fff;text-align:start;text-transform:none;letter-spacing:normal;overflow:visible}\n#subia-oil-template,#subia-oil-template *,#subia-oil-template *::before,#subia-oil-template *::after{box-sizing:border-box}\n#subia-oil-template :where(p,button,input,select){font-size:inherit;line-height:inherit;letter-spacing:normal}\n#subia-oil-template :where(h1,h2,h3){text-transform:none;font-style:normal}\n#subia-oil-template 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.series-range{font-size:13px}\n#subia-oil-template .text-link{min-height:44px;font-size:14px}\n#subia-oil-template .table-wrap table{min-width:660px}\n#subia-oil-template table{font-size:14px;line-height:1.6}\n#subia-oil-template th,#subia-oil-template td{padding:15px}\n#subia-oil-template caption{font-size:13px;padding:14px 15px}\n#subia-oil-template .model-code summary{font-size:16px;padding:22px 0}\n#subia-oil-template .construction-grid{gap:30px}\n#subia-oil-template .process-photo img{height:300px;object-position:55% center}\n#subia-oil-template .technical-list{grid-template-columns:1fr;gap:0;margin-top:30px}\n#subia-oil-template .technical-list>div{grid-template-columns:33fr 67fr;gap:22px;padding:23px 0}\n#subia-oil-template .technical-list dt{font-size:16px}\n#subia-oil-template .technical-list dd,#subia-oil-template .technical-list dd span{font-size:14px}\n#subia-oil-template .split-section,#subia-oil-template .high-voltage-grid{grid-template-columns:1fr;gap:30px;margin-bottom:30px}\n#subia-oil-template .split-section .equipment-figure{order:-1}\n#subia-oil-template .equipment-figure img{height:370px}\n#subia-oil-template .equipment-figure figcaption{font-size:11px}\n#subia-oil-template .performance-grid{gap:32px}\n#subia-oil-template .action-row{gap:18px;flex-direction:column;align-items:flex-start}\n#subia-oil-template .document-row{align-items:flex-start;gap:20px;flex-direction:column;padding:25px 0}\n#subia-oil-template .document-row strong{font-size:18px}\n#subia-oil-template .document-row small{font-size:13px}\n#subia-oil-template .document-action{min-height:40px;font-size:14px}\n#subia-oil-template .document-footnote{font-size:14px;margin-top:25px}\n#subia-oil-template .rfq>.rail{grid-template-columns:1fr;gap:30px}\n#subia-oil-template .rfq .button{justify-self:start}\n#subia-oil-template .rfq p{font-size:15px}\n#subia-oil-template .oil-modal{width:100vw;height:100dvh;max-height:100dvh;margin:0;box-shadow:none}\n#subia-oil-template .oil-modal>header{padding:18px 16px;gap:18px}\n#subia-oil-template .oil-modal>header h2{font-size:21px;letter-spacing:-.025em}\n#subia-oil-template .oil-modal>header .icon-button{width:42px;height:42px}\n#subia-oil-template .modal-tabs{padding:0 16px;gap:25px;overflow:auto}\n#subia-oil-template .modal-tabs button{font-size:13px;padding:16px 0}\n#subia-oil-template [data-modal-scroll]{padding:22px 16px}\n#subia-oil-template .modal-overview{display:flex;flex-direction:column;gap:30px}\n#subia-oil-template .modal-gallery{width:100%}\n#subia-oil-template .gallery-stage{height:290px}\n#subia-oil-template .gallery-thumbs{gap:8px}\n#subia-oil-template .gallery-thumbs button{width:70px;height:64px}\n#subia-oil-template .modal-overview p{font-size:15px}\n#subia-oil-template .oil-modal>footer{padding:14px 16px;gap:16px}\n#subia-oil-template .oil-modal>footer>span{display:none}\n#subia-oil-template .oil-modal>footer .button{width:100%;min-height:48px}\n#subia-oil-template .modal-facts>div{grid-template-columns:42fr 58fr;gap:18px}\n#subia-oil-template .rating-toolbar{gap:15px;align-items:flex-start;flex-direction:column;margin-top:28px}\n#subia-oil-template .rating-toolbar label{gap:12px;flex-wrap:wrap}\n#subia-oil-template .rating-toolbar select{font-size:16px}\n#subia-oil-template .rating-toolbar p{font-size:13px}\n#subia-oil-template .scroll-hint{font-size:12px}\n#subia-oil-template .oil-modal .document-row{padding-block:20px}\n#subia-oil-template .oil-modal .document-row strong{font-size:17px}\n#subia-oil-template .oil-modal .table-wrap table{min-width:600px}\n#subia-oil-template .oil-modal [data-rating-matrix]{min-width:1050px}\n}\n@media(max-width:360px){\n#subia-oil-template .oil-hero h1{font-size:37px}\n#subia-oil-template .oil-hero{min-height:510px}\n#subia-oil-template .product-photo img{height:270px}\n#subia-oil-template .equipment-figure img{height:310px}\n#subia-oil-template .oil-modal>header h2{font-size:19px}\n#subia-oil-template .modal-tabs{gap:22px}\n}\n#subia-oil-template .section-heading>*,#subia-oil-template .construction-grid>*,#subia-oil-template .split-section>*,#subia-oil-template .performance-grid>*,#subia-oil-template .high-voltage-grid>*,#subia-oil-template .modal-overview>*{min-width:0}\n#subia-oil-template .oil-modal [data-modal-panel=technical] table:not([data-rating-matrix]){min-width:0}\n#subia-oil-template a:hover,#subia-oil-template .text-link:hover{color:var(--slate)}\n#subia-oil-template .button-orange:hover{background:var(--slate);border-color:var(--slate);color:#fff}\n#subia-oil-template .hero-caption{font-size:11px}\n@media(min-width:768px) and (max-width:1000px){\n#subia-oil-template .app-explorer.is-interactive .app-panel-image{grid-row:1}\n#subia-oil-template .app-explorer.is-interactive .app-panel-image img{height:auto;min-height:0}\n#subia-oil-template .app-explorer.is-interactive .app-panel-copy{grid-column:1\/-1;grid-row:2;align-self:start;max-width:90ch}\n#subia-oil-template .app-tab{min-height:90px;padding:14px 12px}\n}\n@media(prefers-reduced-motion:reduce){\n#subia-oil-template *,#subia-oil-template *::before,#subia-oil-template *::after{scroll-behavior:auto!important;transition:none!important}\n}\n@media print{\n#subia-oil-template .section-nav,#subia-oil-template .oil-modal,#subia-oil-template .text-link,#subia-oil-template .button{display:none!important}\n#subia-oil-template .rail{width:100%}\n#subia-oil-template .oil-hero{min-height:270px}\n#subia-oil-template .oil-section{padding:30px 0}\n#subia-oil-template .table-wrap{overflow:visible}\n#subia-oil-template .table-wrap table{font-size:10px;min-width:0}\n#subia-oil-template .oil-section{break-inside:avoid}\n#subia-oil-template h2{font-size:26px}\n}\n#subia-oil-template .oil-modal .modal-document-link{font-size:13px;gap:12px;flex-shrink:0}\n@media(max-width:700px){\n#subia-oil-template .oil-modal>footer{flex-wrap:wrap;justify-content:center;gap:10px}\n#subia-oil-template .oil-modal .modal-document-link{font-size:12px}\n}\n#subia-oil-template .app-section .section-heading{margin-bottom:46px;align-items:start}\n#subia-oil-template .app-section .section-heading>p{max-width:64ch}\n#subia-oil-template .app-scenes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px}\n#subia-oil-template .app-scene{min-width:0}\n#subia-oil-template .app-scene-image{margin:0 0 26px;overflow:hidden;background:var(--paper)}\n#subia-oil-template .app-scene-image img{display:block;width:100%;height:auto;aspect-ratio:3\/2;object-fit:cover}\n#subia-oil-template .app-scene h3{font-size:25px;line-height:1.3;letter-spacing:-.025em;margin:0 0 16px;max-width:22ch}\n#subia-oil-template .app-scene p{font-size:15px;line-height:1.8;max-width:46ch;margin:0}\n#subia-oil-template .app-image-note{font-size:12px;line-height:1.6;color:#536b74;margin:28px 0 0}\n#subia-oil-template .site-conditions-section{border-bottom:1px solid var(--line)}\n#subia-oil-template .site-conditions-layout{display:grid;grid-template-columns:35fr 65fr;gap:76px;align-items:start}\n#subia-oil-template .site-conditions-layout>*{min-width:0}\n#subia-oil-template .site-conditions-intro h2{max-width:12ch}\n#subia-oil-template .site-conditions-intro p{font-size:15px;line-height:1.8;max-width:44ch}\n#subia-oil-template .site-condition-list{margin:0}\n#subia-oil-template .site-condition-list>div{display:grid;grid-template-columns:28fr 72fr;gap:30px;padding:25px 0;border-top:1px solid #c5d5d9}\n#subia-oil-template .site-condition-list>div:last-child{border-bottom:1px solid #c5d5d9}\n#subia-oil-template .site-condition-list dt{font-size:18px;line-height:1.45;font-weight:550;color:var(--slate)}\n#subia-oil-template .site-condition-list dd{margin:0;min-width:0}\n#subia-oil-template .site-condition-list dd>p{font-size:15px;line-height:1.65;margin:0}\n#subia-oil-template .site-condition-list .site-design-review{font-size:13px;color:#536b74;margin-top:12px}\n#subia-oil-template .site-design-review>span{display:block;font-size:11px;font-weight:550;color:var(--teal);margin-bottom:3px}\n@media(max-width:1200px){\n#subia-oil-template .app-scenes{gap:26px}\n#subia-oil-template .app-scene h3{font-size:23px}\n#subia-oil-template .site-conditions-layout{gap:45px;grid-template-columns:36fr 64fr}\n#subia-oil-template .site-condition-list>div{grid-template-columns:30fr 70fr;gap:24px}\n}\n@media(max-width:1000px){\n#subia-oil-template .app-scenes{gap:22px}\n#subia-oil-template .app-scene h3{font-size:21px}\n#subia-oil-template .app-scene p{font-size:14px}\n#subia-oil-template .site-conditions-layout{grid-template-columns:1fr;gap:34px}\n#subia-oil-template .site-conditions-intro h2{max-width:none}\n#subia-oil-template .site-conditions-intro p{max-width:80ch}\n#subia-oil-template .site-condition-list>div{grid-template-columns:27fr 73fr}\n}\n@media(max-width:767px){\n#subia-oil-template .app-section .section-heading{margin-bottom:32px}\n#subia-oil-template .app-scenes{grid-template-columns:1fr;gap:42px}\n#subia-oil-template .app-scene-image{margin-bottom:22px}\n#subia-oil-template .app-scene h3{font-size:26px;margin-bottom:14px;max-width:none}\n#subia-oil-template .app-scene p{font-size:15px;max-width:none}\n#subia-oil-template .app-image-note{margin-top:26px;font-size:12px}\n#subia-oil-template .site-conditions-layout{gap:30px}\n#subia-oil-template .site-conditions-intro p{font-size:15px}\n#subia-oil-template .site-condition-list>div{grid-template-columns:1fr;gap:13px;padding:24px 0}\n#subia-oil-template .site-condition-list dt{font-size:19px}\n#subia-oil-template .site-condition-list dd>p{font-size:15px}\n#subia-oil-template .site-condition-list .site-design-review{font-size:14px;margin-top:11px}\n#subia-oil-template .site-design-review>span{font-size:12px}\n}\n@media print{\n#subia-oil-template .app-scenes{gap:20px}\n#subia-oil-template .site-conditions-layout{grid-template-columns:1fr;gap:22px}\n#subia-oil-template .site-condition-list>div{padding:14px 0;break-inside:avoid}\n#subia-oil-template .app-scene-image img{break-inside:avoid}\n}\n#subia-oil-template .balanced-section .balanced-heading,#subia-oil-template .site-conditions-header .balanced-heading{max-width:none;margin-bottom:36px}\n#subia-oil-template .balanced-copy{display:grid;gap:48px;margin-bottom:44px;align-items:start}\n#subia-oil-template .balanced-copy-2{grid-template-columns:repeat(2,minmax(0,1fr))}\n#subia-oil-template .balanced-copy-3{grid-template-columns:repeat(3,minmax(0,1fr))}\n#subia-oil-template .balanced-copy>div{min-width:0}\n#subia-oil-template .balanced-copy h3{font-size:21px;line-height:1.35;letter-spacing:-.02em;margin:0 0 18px}\n#subia-oil-template .balanced-copy p{font-size:16px;line-height:1.8;margin:0;max-width:74ch}\n#subia-oil-template .balanced-section.dark .balanced-copy h3{color:#fff}\n#subia-oil-template .balanced-section .balanced-copy+.technical-list{margin-top:0}\n#subia-oil-template .app-explorer{min-width:0}\n#subia-oil-template .app-explorer .app-tabs{display:none}\n#subia-oil-template .app-panels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px;min-width:0}\n#subia-oil-template .app-panel{min-width:0}\n#subia-oil-template .app-panel-image{margin:0 0 25px;background:var(--paper);overflow:hidden}\n#subia-oil-template .app-panel-image img{display:block;width:100%;height:auto;aspect-ratio:3\/2;object-fit:cover}\n#subia-oil-template .app-panel-copy h3{font-size:26px;line-height:1.3;letter-spacing:-.025em;margin:0 0 16px}\n#subia-oil-template .app-panel-copy p{font-size:15px;line-height:1.8;margin:0;max-width:74ch}\n#subia-oil-template .app-explorer.is-interactive{display:grid;grid-template-columns:minmax(0,65fr) minmax(0,35fr);grid-template-rows:auto 1fr;gap:36px 48px;align-items:start}\n#subia-oil-template .app-explorer.is-interactive .app-panels{display:contents}\n#subia-oil-template .app-explorer.is-interactive .app-panel{display:grid;grid-column:1\/-1;grid-row:1\/3;grid-template-columns:subgrid;grid-template-rows:subgrid}\n#subia-oil-template .app-explorer.is-interactive .app-panel-image{grid-column:1;grid-row:1\/3;margin:0;align-self:stretch}\n#subia-oil-template .app-explorer.is-interactive .app-panel-image img{height:100%;min-height:100%;object-fit:cover}\n#subia-oil-template .app-explorer.is-interactive .app-panel-copy{grid-column:2;grid-row:2;align-self:end}\n#subia-oil-template .app-explorer.is-interactive .app-tabs{display:flex;flex-direction:column;grid-column:2;grid-row:1;align-self:start;min-width:0;position:relative;z-index:1}\n#subia-oil-template .app-tab{display:grid;grid-template-columns:88px minmax(0,1fr) 20px;gap:18px;align-items:center;width:100%;min-height:112px;padding:18px 16px;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--slate);text-align:left;font:550 19px\/1.45 Lexend,sans-serif;transition:background .18s ease,color .18s ease,border-color .18s ease}\n#subia-oil-template .app-tab:first-child{border-top:1px solid var(--line)}\n#subia-oil-template .app-tab img{display:block;width:88px;height:auto;aspect-ratio:3\/2;object-fit:cover}\n#subia-oil-template .app-tab>svg{display:block;width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6}\n#subia-oil-template .app-tab:hover{background:#edf3f4;color:var(--teal)}\n#subia-oil-template .app-tab[aria-selected=\"true\"]{background:var(--paper);color:var(--teal);border-bottom-color:var(--teal)}\n#subia-oil-template .app-explorer.is-interactive .app-panel-copy h3{font-size:29px}\n#subia-oil-template .app-explorer.is-interactive .app-panel[hidden]{display:none}\n#subia-oil-template .site-conditions-header .balanced-copy{margin-bottom:46px}\n#subia-oil-template .site-condition-accordion{border-top:1px solid #c5d5d9}\n#subia-oil-template .site-condition{--site-title-column:30%;border-bottom:1px solid #c5d5d9}\n#subia-oil-template .site-condition summary{list-style:none;display:grid;grid-template-columns:var(--site-title-column) minmax(0,1fr) 24px;gap:30px;align-items:start;padding:26px 0;cursor:pointer;transition:color .15s ease}\n#subia-oil-template .site-condition summary::-webkit-details-marker{display:none}\n#subia-oil-template .site-condition-title{font-size:19px;font-weight:550;line-height:1.45;color:var(--slate)}\n#subia-oil-template .site-condition-input{font-size:16px;line-height:1.7;color:var(--copy)}\n#subia-oil-template .site-condition summary:hover .site-condition-title{color:var(--teal)}\n#subia-oil-template .site-condition-toggle{width:24px;height:24px;fill:none;stroke:var(--teal);stroke-width:1.5;flex-shrink:0;margin-top:2px}\n#subia-oil-template .site-condition-toggle .site-toggle-vertical{transform-origin:center;transition:transform .18s ease,opacity .18s ease}\n#subia-oil-template .site-condition[open] .site-toggle-vertical{transform:rotate(90deg);opacity:0}\n#subia-oil-template .site-condition[open] summary{padding-bottom:18px}\n#subia-oil-template .site-condition-body{padding:0 54px 26px calc(var(--site-title-column) + 30px)}\n#subia-oil-template .site-condition-body .site-design-review{font-size:14px;line-height:1.7;color:#536b74;margin:0}\n#subia-oil-template .site-condition-body .site-design-review>span{font-size:12px;margin-bottom:5px}\n#subia-oil-template .section-nav a[aria-current=\"location\"]{border-bottom-color:var(--teal);color:var(--teal)}\n#subia-oil-template .section-nav::after{content:\"\";position:absolute;bottom:-1px;left:0;width:100%;height:2px;background:var(--teal);transform:scaleX(var(--reading-progress,0));transform-origin:left center;pointer-events:none}\n@media(max-width:1200px){\n#subia-oil-template .balanced-copy{gap:34px}\n#subia-oil-template .app-explorer.is-interactive{grid-template-columns:minmax(0,63fr) minmax(0,37fr);gap:32px}\n#subia-oil-template .app-tab{grid-template-columns:82px minmax(0,1fr) 18px;gap:14px;padding:20px 12px;font-size:17px;min-height:114px}\n#subia-oil-template .app-tab img{width:82px}\n#subia-oil-template .app-tab>svg{width:18px}\n#subia-oil-template .site-condition{--site-title-column:28%}\n}\n@media(max-width:1000px){\n#subia-oil-template .balanced-copy-3{grid-template-columns:repeat(2,minmax(0,1fr))}\n#subia-oil-template .balanced-copy-3>div:last-child{grid-column:1\/-1;max-width:90ch}\n#subia-oil-template .balanced-copy h3{font-size:20px}\n#subia-oil-template .balanced-copy p{font-size:15px}\n#subia-oil-template .app-explorer.is-interactive{grid-template-columns:minmax(0,60fr) minmax(0,40fr);gap:24px}\n#subia-oil-template .app-tab{grid-template-columns:68px minmax(0,1fr);gap:14px;font-size:16px;min-height:102px;padding:18px 12px}\n#subia-oil-template .app-tab img{width:68px}\n#subia-oil-template .app-tab>svg{display:none}\n#subia-oil-template .app-explorer.is-interactive .app-panel-copy h3{font-size:26px}\n#subia-oil-template .site-condition summary{gap:22px}\n#subia-oil-template .site-condition-body{padding-left:calc(var(--site-title-column) + 22px)}\n}\n@media(max-width:767px){\n#subia-oil-template .balanced-section .balanced-heading,#subia-oil-template .site-conditions-header .balanced-heading{margin-bottom:30px}\n#subia-oil-template .balanced-copy,#subia-oil-template .balanced-copy-2,#subia-oil-template .balanced-copy-3{grid-template-columns:1fr;gap:28px;margin-bottom:34px}\n#subia-oil-template .balanced-copy-3>div:last-child{grid-column:auto}\n#subia-oil-template .balanced-copy h3{font-size:21px;margin-bottom:13px}\n#subia-oil-template .balanced-copy p{font-size:15px}\n#subia-oil-template .app-panels{grid-template-columns:1fr;gap:38px}\n#subia-oil-template .app-explorer.is-interactive{display:flex;flex-direction:column;gap:25px}\n#subia-oil-template .app-explorer.is-interactive .app-panels{display:block;width:100%}\n#subia-oil-template .app-explorer.is-interactive .app-panel{display:block}\n#subia-oil-template .app-explorer.is-interactive .app-panel-image{margin-bottom:22px}\n#subia-oil-template .app-explorer.is-interactive .app-panel-image img{height:auto;min-height:0}\n#subia-oil-template .app-explorer.is-interactive .app-tabs{display:flex;flex-direction:row;gap:0;width:100%;align-self:stretch;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin}\n#subia-oil-template .app-tab{flex:0 0 208px;width:208px;min-height:80px;grid-template-columns:54px minmax(0,1fr);gap:12px;padding:14px 12px;border-top:1px solid var(--line);font-size:14px}\n#subia-oil-template .app-tab img{width:54px}\n#subia-oil-template 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a:hover{color:var(--orange)}\n@media(max-width:767px){\n#subia-oil-template #power-related-transformer-information{padding-block:56px}\n#subia-oil-template #power-related-transformer-information>.ts-wrap{width:calc(100% - 32px)}\n#subia-oil-template #power-related-transformer-information .ts-wrap>ul{grid-template-columns:1fr;gap:0;margin-top:30px}\n#subia-oil-template #power-related-transformer-information a{min-height:44px}\n}\n#subia-oil-template{--oil-header-offset:0px;--oil-nav-height:65px}\n#subia-oil-template .section-nav{top:var(--oil-header-offset)}\n#subia-oil-template .oil-section{scroll-margin-top:calc(var(--oil-header-offset) + var(--oil-nav-height))}\n@media(max-width:767px){#subia-oil-template{--oil-nav-height:57px}}\n\n\/* subia legacy fragment compatibility v1 *\/\n#subia-oil-template .anchor-alias{display:block;height:0}#subia-oil-template .oil-section[id],#subia-oil-template .anchor-alias,#subia-oil-template .series-product[id]{scroll-margin-top:max(180px,calc(var(--oil-header-offset,0px) + var(--oil-nav-height,65px) + 24px))}\n@media(max-width:767px){#subia-oil-template .table-wrap table.property-table{min-width:0;width:100%;table-layout:fixed}#subia-oil-template .table-wrap table.property-table th:first-child{width:40%}#subia-oil-template .table-wrap table.property-table th,#subia-oil-template .table-wrap table.property-table td{overflow-wrap:anywhere}}\n\n\/* Historical information wrapper native fragment inset. *\/\n#power-related-transformer-information{scroll-margin-top:max(180px,calc(var(--oil-header-offset,0px) + var(--oil-nav-height,65px) + 24px))}\n<\/style>\n<div id=\"subia-oil-template\" class=\"subia-oil-template alignfull pd-exhibition\">\n<section class=\"oil-hero\"><img decoding=\"async\" class=\"hero-scene\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/09\/subia-group-production-workshop.webp\" alt=\"Transformer manufacturing workshop\" width=\"2000\" height=\"1333\" fetchpriority=\"high\"><div class=\"hero-shade\"><\/div><div class=\"rail hero-content\"><h1>Power<br>Transformers<\/h1><p>Substation main transformers<br class=\"desktop-break\"> with on-load tap changing.<\/p><\/div><div class=\"rail hero-caption\">Transformer manufacturing workshop<\/div><\/section><nav class=\"section-nav\" aria-label=\"On this page\"><div class=\"rail\"><a href=\"#series\">Series<\/a><a href=\"#electrical-range\">Electrical range<\/a><a href=\"#on-load-voltage-regulation\">Tap changing<\/a><a href=\"#power-construction-design\">Construction &amp; cooling<\/a><a href=\"#monitoring-and-protection\">Protection<\/a><a href=\"#power-electrical-review\">Technical review<\/a><a href=\"#applications\">Applications<\/a><a href=\"#site-conditions\">Buyer FAQs<\/a><\/div><\/nav><p class=\"rail product-error\" data-product-error role=\"status\" hidden><\/p><section class=\"sc-section oil-section series-section\" id=\"series\"><div class=\"rail\"><span class=\"anchor-alias\" id=\"series-products\" aria-hidden=\"true\"><\/span><div class=\"section-heading\"><h2>Main transformer<br>series<\/h2><p>SZ and SZF oil-immersed main transformers provide on-load voltage regulation for substations. Select the cooling arrangement for the project load duty.<\/p><\/div><div class=\"sc-grid series-grid\" data-product-count=\"2\" data-sc-count=\"2\"><article class=\"series-product sc-card\" data-sc-card=\"1\" id=\"record-power-sz-oltc\"><div class=\"ex-series-code\" aria-hidden=\"true\">SZ<\/div><button aria-label=\"View SZ On-load Tap-changing Transformers\" class=\"product-photo sc-card-media\" data-open-product=\"power-sz-oltc\" type=\"button\"><span aria-hidden=\"true\" class=\"sc-brand\"><\/span><span class=\"sc-art sc-art-img\" style=\"--sc-ratio:1.3080357143;--sc-source-width:109.2150170648%;--sc-source-left:-4.6643913538%;--sc-source-top:-27.2321428571%\"><span class=\"sc-art-window\"><img alt=\"SZ On-load Tap-changing Transformers\" class=\"sc-source\" decoding=\"async\" height=\"960\" loading=\"lazy\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f068-960-578393ca.webp\" width=\"960\"\/><\/span><\/span><\/button><div class=\"split-card-copy\"><div class=\"sc-card-heading\"><h3>SZ On-load Tap-changing Transformers<\/h3><\/div><div class=\"sc-card-meta\"><p class=\"series-range\">6,300\u201350,000 kVA \u00b7 SZ11 \/ SZ13 \/ SZ20<\/p><\/div><div class=\"sc-card-description\"><p>Main transformer HV ratings span 69\u2013130 kV, with a 132 kV option. ONAN with optional ONAF.<\/p><\/div><div class=\"sc-card-action\"><button class=\"text-link\" data-open-product=\"power-sz-oltc\" data-start-tab=\"overview\" type=\"button\">View series details<svg aria-hidden=\"true\" viewbox=\"0 0 24 24\"><path d=\"M4 12h15m-6-6 6 6-6 6\"><\/path><\/svg><\/button><\/div><\/div><\/article><article class=\"series-product sc-card\" data-sc-card=\"2\" id=\"record-power-szf-oltc\"><div class=\"ex-series-code\" aria-hidden=\"true\">SZF<\/div><button aria-label=\"View SZF Forced-air-cooled Transformers\" class=\"product-photo sc-card-media\" data-open-product=\"power-szf-oltc\" type=\"button\"><span aria-hidden=\"true\" class=\"sc-brand\"><\/span><span class=\"sc-art sc-art-img\" style=\"--sc-ratio:1.1679536680;--sc-source-width:158.6776859504%;--sc-source-left:-32.8925619835%;--sc-source-top:-47.4903474903%\"><span class=\"sc-art-window\"><img alt=\"SZF Forced-air-cooled Transformers\" class=\"sc-source\" decoding=\"async\" height=\"960\" loading=\"lazy\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-960-225b2906.webp\" width=\"960\"\/><\/span><\/span><\/button><div class=\"split-card-copy\"><div class=\"sc-card-heading\"><h3>SZF Forced-air-cooled Transformers<\/h3><\/div><div class=\"sc-card-meta\"><p class=\"series-range\">6,300\u201350,000 kVA \u00b7 SZF11 \/ SZF13 \/ SZF20<\/p><\/div><div class=\"sc-card-description\"><p>Main transformer HV ratings span 69\u2013130 kV, with a 132 kV option. ONAF cooling.<\/p><\/div><div class=\"sc-card-action\"><button class=\"text-link\" data-open-product=\"power-szf-oltc\" data-start-tab=\"overview\" type=\"button\">View series details<svg aria-hidden=\"true\" viewbox=\"0 0 24 24\"><path d=\"M4 12h15m-6-6 6 6-6 6\"><\/path><\/svg><\/button><\/div><\/div><\/article><\/div><\/div><\/section><section class=\"oil-section paper balanced-section\" id=\"electrical-range\" data-source-section=\"electrical-range\"><div class=\"rail\"><h2 class=\"balanced-heading\">Electrical range<\/h2><div class=\"balanced-copy balanced-copy-2\"><div><h3>Series duty<\/h3><p>SZ and SZF transformers combine three-phase oil-immersed construction with on-load voltage regulation. Both series cover 6,300\u201350,000 kVA. SZ is specified with natural cooling and a forced-air option, while SZF uses forced-air cooling as its defining arrangement.<\/p><\/div><div><h3>Voltage and network connection<\/h3><p>Substation main transformer options cover high-voltage ratings from 69\u2013130 kV, with a 132 kV option where specified by the applicable project standard. Select the voltage ratio to suit the incoming network and secondary bus requirements.<\/p><\/div><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Shared electrical options\"><table class=\"property-table power-range-matrix\"><caption><span>Shared electrical options<\/span><strong>SZ \/ SZF<\/strong><\/caption><thead><tr><th scope=\"col\">Item<\/th><th scope=\"col\">SZ \/ SZF series options<\/th><\/tr><\/thead><tbody><tr class=\"range-primary\"><th scope=\"row\">HV Voltage<\/th><td>69\u2013130 kV. 132 kV available where specified by the project standard.<\/td><\/tr><tr class=\"range-secondary\"><th scope=\"row\">LV Voltage<\/th><td>Specified to match the secondary network<\/td><\/tr><tr><th scope=\"row\">Rated Frequency<\/th><td>50Hz \/ 60Hz<\/td><\/tr><tr><th scope=\"row\">Vector Group<\/th><td>Specified for the winding arrangement and network<\/td><\/tr><tr><th scope=\"row\">Regulation Mode<\/th><td>OLTC, on-load voltage regulation (no shutdown required)<\/td><\/tr><tr><th scope=\"row\">Standards<\/th><td>IEC 60076, GB\/T 6451<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>Select capacity, voltage ratio, frequency, vector group and cooling together for the required network duty.<\/p><p>IEC 60076 and GB\/T 6451 are listed design references; project compliance and document scope follow the ordered model.<\/p><\/div><details class=\"model-code\"><summary>Reading the model designation<span aria-hidden=\"true\">+<\/span><\/summary><div><p>The letters identify the transformer arrangement before capacity and voltage are added. S denotes a three-phase transformer; Z denotes on-load tap changing. F identifies the forced-air cooling arrangement in the SZF series.<\/p><p>The series number identifies the loss design. Request the losses, impedance and thermal data for the selected rating.<\/p><\/div><\/details><\/div><\/section><section class=\"oil-section  balanced-section\" id=\"on-load-voltage-regulation\" data-source-section=\"on-load-voltage-regulation\"><div class=\"rail\"><span class=\"anchor-alias\" id=\"regulation\" aria-hidden=\"true\"><\/span><div class=\"construction-editorial\"><h2 class=\"construction-title\">Voltage regulation under load<\/h2><figure class=\"equipment-figure\"><img decoding=\"async\" class=\"\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-960-849b8f8e.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-480-4c3a6c7c.webp 480w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-960-849b8f8e.webp 960w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-1600-a485a4ba.webp 1600w\" sizes=\"auto, (max-width:767px) 90vw, 45vw\" alt=\"Voltage regulation under load\" width=\"960\" height=\"960\" loading=\"lazy\"><figcaption>SZ transformer with side control enclosure<\/figcaption><\/figure><div class=\"construction-copy\"><p>The vacuum on-load tap changer changes the winding tap while the transformer supplies its load. This changes the effective voltage ratio to compensate for incoming voltage variation and maintain the required secondary voltage without a scheduled interruption for each tap adjustment.<\/p><p>The project specification defines the HV tapping range and step size. The selected tap-changer design determines the number of positions, operating sequence and control settings. The on-load tap changer has its own oil compartment, separating switching residues from the main insulating oil.<\/p><p>The tap schedule should match the incoming-voltage range and the required secondary bus voltage. Specify the operating mode, local and remote control requirements, tap-position indication and station interfaces with the electrical duty. These inputs define how the transformer regulator works with the wider substation controls.<\/p><\/div><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Regulation arrangement\"><table class=\"property-table\"><caption>Regulation arrangement<\/caption><thead><tr><th scope=\"col\">Element<\/th><th scope=\"col\">Function in the transformer<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Vacuum on-load tap changer<\/th><td>Changes the winding ratio under load.<\/td><\/tr><tr><th scope=\"row\">HV winding taps<\/th><td>Provide the stepped voltage adjustment stated for the selected configuration.<\/td><\/tr><tr><th scope=\"row\">Separate tap-changer oil compartment<\/th><td>Keeps switching contamination apart from the main transformer oil.<\/td><\/tr><tr><th scope=\"row\">Voltage ratio and vector group<\/th><td>Establish the primary-to-secondary electrical relationship alongside the tap schedule.<\/td><\/tr><tr><th scope=\"row\">Voltage-control inputs<\/th><td>Incoming voltage range, required secondary voltage and agreed operating settings<\/td><\/tr><tr><th scope=\"row\">Station control interfaces<\/th><td>Local\/remote operation, position indication and control wiring as specified for the project<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><\/div><\/div><\/section><section class=\"oil-section pd-tabs pd-paper\" id=\"power-construction-design\" data-pd-tabs=\"\"><div class=\"rail\"><h2 class=\"pd-topic-heading\">Construction and cooling design<\/h2><div class=\"pd-tablist\" role=\"tablist\" aria-label=\"Construction and cooling design\" hidden><button class=\"pd-tab\" id=\"pd-763-power-construction-design-tab-1\" type=\"button\" role=\"tab\" aria-controls=\"construction\" aria-selected=\"true\" tabindex=\"0\">Core &amp; oil system<\/button><button class=\"pd-tab\" id=\"pd-763-power-construction-design-tab-2\" type=\"button\" role=\"tab\" aria-controls=\"cooling-and-thermal-duty\" aria-selected=\"false\" tabindex=\"-1\">Cooling &amp; thermal duty<\/button><\/div><div class=\"oil-section paper balanced-section pd-panel\" id=\"construction\" role=\"tabpanel\" aria-labelledby=\"pd-763-power-construction-design-tab-1\" tabindex=\"0\" data-source-section=\"core-windings-and-oil-system\"><div class=\"rail\"><span class=\"anchor-alias\" id=\"core\" aria-hidden=\"true\"><\/span><span class=\"anchor-alias\" id=\"tank\" aria-hidden=\"true\"><\/span><div class=\"split-section\"><div><h3 class=\"pd-panel-heading\">Core, windings and oil system<\/h3><p>The active part uses high-permeability, grain-oriented cold-rolled silicon steel with a multistep laminated core and fully mitered joints. Oxygen-free copper conductors form the windings. Continuous or interleaved winding arrangements with closely wrapped insulation allow the winding layout to follow the electrical and mechanical requirements of the rated design.<\/p><p>The welded steel tank contains the oil used for insulation and heat transfer. The oil system combines oxidation-resistant transformer oil with an anti-corrosion tank finish and ageing-resistant sealing gaskets. An optional conservator forms part of the selected oil-system arrangement.<\/p><p>The tank, cooling surfaces and oil accessories also establish the installation footprint. Terminal positions, conservator access, oil sampling points and service clearances should be coordinated with the station layout. Overall dimensions and transport masses follow the selected capacity and accessory arrangement.<\/p><\/div><figure class=\"equipment-figure\"><img decoding=\"async\" class=\"\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-960-44b8ae1f.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-480-25cb3575.webp 480w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-960-44b8ae1f.webp 960w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-1600-3194bda2.webp 1600w\" sizes=\"auto, (max-width:767px) 90vw, 45vw\" alt=\"Core, windings and oil system\" width=\"960\" height=\"960\" loading=\"lazy\"><figcaption>SZ oil-immersed transformer tank and conservator<\/figcaption><\/figure><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Construction details\"><table class=\"property-table\"><caption>Construction details<\/caption><thead><tr><th scope=\"col\">Component<\/th><th scope=\"col\">Documented construction<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Core steel<\/th><td>High-permeability, grain-oriented cold-rolled silicon steel<\/td><\/tr><tr><th scope=\"row\">Core assembly<\/th><td>Multistep laminated construction with fully mitered joints<\/td><\/tr><tr><th scope=\"row\">Windings<\/th><td>Oxygen-free copper; continuous or interleaved construction<\/td><\/tr><tr><th scope=\"row\">Main tank<\/th><td>Welded steel with anti-corrosion coating<\/td><\/tr><tr><th scope=\"row\">Insulating medium<\/th><td>Transformer oil for insulation and heat transfer<\/td><\/tr><tr><th scope=\"row\">Sealing<\/th><td>Ageing-resistant rubber gaskets<\/td><\/tr><tr><th scope=\"row\">Oil-system accessory<\/th><td>Optional conservator<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><\/div><\/div><\/div><div class=\"oil-section  balanced-section pd-panel\" id=\"cooling-and-thermal-duty\" role=\"tabpanel\" aria-labelledby=\"pd-763-power-construction-design-tab-2\" tabindex=\"0\" data-source-section=\"cooling-and-thermal-duty\"><div class=\"rail\"><span class=\"anchor-alias\" id=\"cooling\" aria-hidden=\"true\"><\/span><div class=\"split-section\"><figure class=\"equipment-figure\"><img decoding=\"async\" class=\"\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-960-225b2906.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-480-3cb1baf9.webp 480w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-960-225b2906.webp 960w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-1600-593f5649.webp 1600w\" sizes=\"auto, (max-width:767px) 90vw, 45vw\" alt=\"Cooling and thermal duty\" width=\"960\" height=\"960\" loading=\"lazy\"><figcaption>SZF transformer with radiator fans<\/figcaption><\/figure><div><h3 class=\"pd-panel-heading\">Cooling and thermal duty<\/h3><p>ONAN uses natural oil circulation inside the transformer and natural air circulation outside the cooling surfaces. It is the standard SZ cooling arrangement. ONAF retains natural oil circulation and adds fans to move air across the radiators; it is the stated arrangement for SZF and an option within SZ.<\/p><p>For the SZF construction, temperature control starts and stops the cooling fans as operating temperature changes. This supports heat removal during sustained loading while allowing the fans to stop when cooling demand is lower. The required rating is tied to the selected cooling mode and ambient conditions; adding fans does not by itself establish an additional kVA rating.<\/p><p>Specify the top-oil temperature-rise limit alongside the site temperature and load cycle. For a forced-air design, include the fan auxiliary supply, control connections and required operation following loss of fan supply.<\/p><div class=\"action-row\"><button type=\"button\" class=\"text-link\" data-open-product=\"power-szf-oltc\" data-start-tab=\"technical\">SZF Forced-air-cooled On-load Tap-changing Transformers<svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><\/div><\/div><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Cooling and thermal provisions\"><table class=\"property-table\"><caption>Cooling and thermal provisions<\/caption><thead><tr><th scope=\"col\">Provision<\/th><th scope=\"col\">Series description<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">SZ standard cooling<\/th><td>ONAN \u2014 Oil Natural Air Natural<\/td><\/tr><tr><th scope=\"row\">SZ optional cooling<\/th><td>ONAF \u2014 Oil Natural Air Forced<\/td><\/tr><tr><th scope=\"row\">SZF cooling<\/th><td>ONAF, with radiator fans<\/td><\/tr><tr><th scope=\"row\">SZF fan control<\/th><td>Automatic start and stop by temperature control<\/td><\/tr><tr><th scope=\"row\">Top-oil rise criterion<\/th><td>Specified for the selected rating and cooling duty<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>Temperature rise is the increase above ambient temperature. The ambient range, loading cycle and cooling equipment must be considered together in the transformer thermal design.<\/p><\/div><\/div><\/div><\/div><\/section><section class=\"oil-section dark balanced-section\" id=\"monitoring-and-protection\" data-source-section=\"monitoring-and-protection\"><div class=\"rail\"><h2 class=\"balanced-heading\">Monitoring and protection<\/h2><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Accessory and monitoring functions\"><table class=\"property-table monitor-devices\"><caption>Accessory and monitoring functions<\/caption><thead><tr><th scope=\"col\">Device<\/th><th scope=\"col\">Role<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Temperature controller<\/th><td>Thermal monitoring; alarm and trip functions according to the selected controller<\/td><\/tr><tr><th scope=\"row\">Oil-level indicator<\/th><td>Local indication of oil level<\/td><\/tr><tr><th scope=\"row\">Gas relay<\/th><td>Gas-related fault monitoring in the applicable oil-system arrangement<\/td><\/tr><tr><th scope=\"row\">Pressure-relief valve<\/th><td>Pressure relief for the transformer oil tank<\/td><\/tr><tr><th scope=\"row\">Conservator<\/th><td>Oil-system expansion arrangement when selected<\/td><\/tr><tr><th scope=\"row\">Cooling-fan assembly<\/th><td>Forced-air radiator cooling on the SZF arrangement<\/td><\/tr><\/tbody><\/table><\/div><div class=\"balanced-copy balanced-copy-3\"><div><h3>Operating indicators<\/h3><p>Temperature and oil-level monitoring give operating staff a direct view of the transformer oil system. Gas protection and pressure relief are also available within the accessory arrangement. Alarm and trip functions are arranged around the selected devices and the station protection scheme, with the SZF temperature controls also serving the cooling fans.<\/p><\/div><div><h3>Fault-protection devices<\/h3><p>These devices serve different purposes. An oil-level indicator shows the oil level, a temperature controller supports thermal supervision, and a gas relay provides an oil-system fault signal. A pressure-relief valve addresses abnormal tank pressure. The accessory schedule determines which devices and contacts are fitted to each transformer.<\/p><\/div><div><h3>Station interfaces<\/h3><p>The station design should identify which signals are needed locally and which must reach the protection or control panel. Specify alarm and trip contacts, terminal arrangements and auxiliary supplies together. For SZF, include the fan-control status and its relationship to the temperature monitoring arrangement.<\/p><\/div><\/div><div class=\"table-notes\"><\/div><\/div><\/section><section class=\"oil-section pd-tabs pd-paper\" id=\"power-electrical-review\" data-pd-tabs=\"\"><div class=\"rail\"><h2 class=\"pd-topic-heading\">Performance and specified configurations<\/h2><div class=\"pd-tablist\" role=\"tablist\" aria-label=\"Performance and specified configurations\" hidden><button class=\"pd-tab\" id=\"pd-763-power-electrical-review-tab-1\" type=\"button\" role=\"tab\" aria-controls=\"performance\" aria-selected=\"true\" tabindex=\"0\">Losses &amp; impedance<\/button><button class=\"pd-tab\" id=\"pd-763-power-electrical-review-tab-2\" type=\"button\" role=\"tab\" aria-controls=\"sz22-35kv-configuration\" aria-selected=\"false\" tabindex=\"-1\">31.5 MVA reference<\/button><\/div><div class=\"oil-section  balanced-section pd-panel\" id=\"performance\" role=\"tabpanel\" aria-labelledby=\"pd-763-power-electrical-review-tab-1\" tabindex=\"0\" data-source-section=\"loss-and-impedance\"><div class=\"rail\"><h3 class=\"pd-panel-heading\">Losses and network impedance<\/h3><div class=\"balanced-copy balanced-copy-3\"><div><h3>Loss specification<\/h3><p>No-load loss and load loss describe different parts of the operating duty. No-load loss is relevant whenever the transformer is energized; load loss depends on the load carried and the stated reference temperature. Specify both values with the rated voltage, frequency and tapping position when preparing the loss schedule.<\/p><\/div><div><h3>10 MVA configuration<\/h3><p>For a 10 MVA SZ11 configuration at 35\/10.5 kV, the published typical values are 8\u201312 kW no-load loss and 45\u201355 kW load loss at a 75 \u00b0C reference temperature. The same configuration lists YNd11, 50 Hz and an HV tap range of \u00b18 \u00d7 1.25%. Its typical ranges are available in the SZ technical panel.<\/p><\/div><div><h3>Network impedance<\/h3><p>Short-circuit impedance belongs in the network and protection study alongside voltage ratio, vector group and operating taps. The 10 MVA reference gives 7.5\u20138%; the ordered impedance follows the project specification. For parallel service, review the transformer data together with the existing unit and its regulating arrangement.<\/p><\/div><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Electrical values to define in the project data sheet\"><table class=\"property-table\"><caption>Electrical values to define in the project data sheet<\/caption><thead><tr><th scope=\"col\">Item<\/th><th scope=\"col\">Specification basis<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">No-load loss<\/th><td>Rated voltage and frequency, with the specified tapping condition<\/td><\/tr><tr><th scope=\"row\">Load loss<\/th><td>Rated load and declared reference temperature<\/td><\/tr><tr><th scope=\"row\">Short-circuit impedance<\/th><td>Network study, rated power and agreed tapping condition<\/td><\/tr><tr><th scope=\"row\">Cooling rating<\/th><td>Capacity assigned to each selected cooling mode<\/td><\/tr><tr><th scope=\"row\">Parallel operation<\/th><td>Voltage ratio, vector group, impedance and tap-control coordination<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>The tap schedule applies to this 10 MVA SZ11 reference configuration.<\/p><\/div><div class=\"action-row\"><button type=\"button\" class=\"text-link\" data-open-product=\"power-sz-oltc\" data-start-tab=\"technical\">SZ On-load Tap-changing Transformers<svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><button type=\"button\" class=\"text-link\" data-open-product=\"power-szf-oltc\" data-start-tab=\"technical\">SZF Forced-air-cooled On-load Tap-changing Transformers<svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><\/div><\/div><\/div><div class=\"oil-section paper balanced-section pd-panel\" id=\"sz22-35kv-configuration\" role=\"tabpanel\" aria-labelledby=\"pd-763-power-electrical-review-tab-2\" tabindex=\"0\" data-source-section=\"sz22-35kv-configuration\"><div class=\"rail\"><h3 class=\"pd-panel-heading\">A 31.5 MVA, 35\/10.5 kV configuration<\/h3><div class=\"balanced-copy balanced-copy-2\"><div><h3>Electrical configuration<\/h3><p>The SZ22-31500\/35\/10.5 configuration has a rated power of 31.5 MVA at 50 Hz, with a 35 kV primary and 10.5 kV secondary. Its published HV tapping range is \u00b13 \u00d7 2.5%.<\/p><\/div><div><h3>Model documents<\/h3><p>Model documentation includes CB Test Certificate HU-006303 and Test Verification of Conformity CN266T87 001, both dated 9 March 2026 and naming JIANGSU SUBIAN POWER EQUIPMENT CO., LTD. The copies identify SZ22-31500\/35\/10.5 and its electrical ratings. They are available in the SZ product-information panel.<\/p><\/div><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZ22-31500\/35\/10.5 \u2014 published configuration\"><table class=\"property-table\"><caption>SZ22-31500\/35\/10.5 \u2014 published configuration<\/caption><thead><tr><th scope=\"col\">Property<\/th><th scope=\"col\">Value<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Model<\/th><td>SZ22-31500\/35\/10.5<\/td><\/tr><tr><th scope=\"row\">Rated power<\/th><td>31,500 kVA<\/td><\/tr><tr><th scope=\"row\">Rated voltage, HV \/ LV<\/th><td>35 \/ 10.5 kV<\/td><\/tr><tr><th scope=\"row\">HV tapping range<\/th><td>\u00b13 \u00d7 2.5%<\/td><\/tr><tr><th scope=\"row\">Rated frequency<\/th><td>50 Hz<\/td><\/tr><tr><th scope=\"row\">Rated current, HV \/ LV<\/th><td>519.6 \/ 1,732.1 A<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>These ratings and the \u00b13 \u00d7 2.5% tapping range apply to the documented SZ22 configuration.<\/p><\/div><ul class=\"content-list\"><li>CB Test Certificate HU-006303: the available first page states the model, rated power, HV\/LV voltage, tapping range, frequency and rated currents.<\/li><li>Test Verification of Conformity CN266T87 001, verification number 50716973: a one-page document naming the same model and electrical ratings.<\/li><li>The document copies are available from the SZ product-information panel.<\/li><\/ul><\/div><\/div><\/div><\/section><section class=\"oil-section  balanced-section\" id=\"applications\" data-source-section=\"applications\"><div class=\"rail\"><div class=\"section-heading\"><h2 class=\"balanced-heading\">Applications<\/h2><div><p>Substation main transformers regulate the secondary bus as incoming voltage varies. SZ and SZF cover utility, industrial and renewable-energy substation duties. SZF uses forced-air cooling for sustained loading.<\/p><\/div><\/div><div class=\"app-explorer\" data-application-switcher><div class=\"app-tabs\" data-application-tabs role=\"tablist\" aria-label=\"Application environments\" aria-orientation=\"vertical\"><button type=\"button\" class=\"app-tab\" id=\"app-tab-utility\" data-application-tab=\"utility\" role=\"tab\" aria-controls=\"app-panel-utility\" aria-selected=\"true\" tabindex=\"0\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-utility-640.webp\" alt=\"\" width=\"96\" height=\"64\" loading=\"lazy\"><span>Utility substations<\/span><svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><button type=\"button\" class=\"app-tab\" id=\"app-tab-manufacturing\" data-application-tab=\"manufacturing\" role=\"tab\" aria-controls=\"app-panel-manufacturing\" aria-selected=\"false\" tabindex=\"-1\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-manufacturing-640.webp\" alt=\"\" width=\"96\" height=\"64\" loading=\"lazy\"><span>Industrial plants<\/span><svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><button type=\"button\" class=\"app-tab\" id=\"app-tab-heavy-industry\" data-application-tab=\"heavy-industry\" role=\"tab\" aria-controls=\"app-panel-heavy-industry\" aria-selected=\"false\" tabindex=\"-1\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-heavy-industry-640.webp\" alt=\"\" width=\"96\" height=\"64\" loading=\"lazy\"><span>Heavy industry<\/span><svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><\/div><div class=\"app-panels\"><article class=\"app-panel\" id=\"app-panel-utility\" data-application-panel=\"utility\" role=\"tabpanel\" aria-labelledby=\"app-tab-utility\" tabindex=\"0\"><figure class=\"app-panel-image\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-utility-1280.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-utility-640.webp 640w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-utility-1280.webp 1280w\" sizes=\"auto, (max-width:767px) calc(100vw - 32px), (max-width:1200px) 62vw, 850px\" alt=\"Illustrative outdoor utility distribution site and its surrounding service area\" width=\"1536\" height=\"1024\" loading=\"lazy\"><\/figure><div class=\"app-panel-copy\"><h3>Utility substations<\/h3><p>Step down the incoming grid voltage and regulate the substation secondary bus under load.<\/p><\/div><\/article><article class=\"app-panel\" id=\"app-panel-manufacturing\" data-application-panel=\"manufacturing\" role=\"tabpanel\" aria-labelledby=\"app-tab-manufacturing\" tabindex=\"0\"><figure class=\"app-panel-image\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-manufacturing-1280.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-manufacturing-640.webp 640w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-manufacturing-1280.webp 1280w\" sizes=\"auto, (max-width:767px) calc(100vw - 32px), (max-width:1200px) 62vw, 850px\" alt=\"Illustrative manufacturing campus with factory buildings and a dedicated power distribution area\" width=\"1536\" height=\"1024\" loading=\"lazy\"><\/figure><div class=\"app-panel-copy\"><h3>Industrial plants<\/h3><p>Match the plant main substation&#8217;s voltage ratio, tap range and cooling to the incoming supply and operating load cycle.<\/p><\/div><\/article><article class=\"app-panel\" id=\"app-panel-heavy-industry\" data-application-panel=\"heavy-industry\" role=\"tabpanel\" aria-labelledby=\"app-tab-heavy-industry\" tabindex=\"0\"><figure class=\"app-panel-image\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-heavy-industry-1280.webp\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-heavy-industry-640.webp 640w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-oil-application-heavy-industry-1280.webp 1280w\" sizes=\"auto, (max-width:767px) calc(100vw - 32px), (max-width:1200px) 62vw, 850px\" alt=\"Illustrative heavy-industrial facility and its outdoor electrical infrastructure\" width=\"1536\" height=\"1024\" loading=\"lazy\"><\/figure><div class=\"app-panel-copy\"><h3>Heavy industry<\/h3><p>Coordinate on-load voltage regulation with cooling, protection and maintenance requirements for sustained industrial loads.<\/p><\/div><\/article><\/div><\/div><p class=\"app-image-note\">Illustrative application environments.<\/p><div class=\"application-coordination\"><div><p>Use the substation single-line diagram to specify the main transformer&#8217;s voltage ratio, impedance, vector group and protection. Confirm the site&#8217;s load cycle and cooling duty. For a renewable-energy substation, match the transformer ratio and tap range to the grid connection requirements.<\/p><\/div><ul class=\"content-list\"><li>Utility substations require a voltage ratio and tap range matched to the incoming grid and secondary bus.<\/li><li>Industrial main substations must account for incoming voltage variation and plant demand.<\/li><li>Metallurgy and mining: combine voltage regulation with a cooling arrangement chosen for sustained loading.<\/li><li>Renewable-energy connections: coordinate voltage ratio, regulation range, vector group and protection with the plant connection scheme.<\/li><\/ul><\/div><\/div><\/section><section class=\"oil-section pd-faq-section\" id=\"site-conditions\"><div class=\"rail\"><div class=\"pd-faq-heading\"><h2>Power transformer buying questions<\/h2><\/div><div class=\"pd-faq-list\"><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which site conditions should be defined before selection?<\/summary><div class=\"pd-faq-answer\"><div class=\"balanced-copy balanced-copy-2\"><div><p>The installation environment affects cooling, insulation surfaces and the tank finish. Supply the ambient-temperature range, altitude and exposure to dust, salt or corrosive contaminants with the load profile. Outdoor construction still needs adequate airflow around the cooling surfaces and access to operating devices.<\/p><\/div><div><p>Civil and electrical layouts should account for the transformer, its conservator or radiator arrangement, cable or busbar approach and maintenance access. For forced-air cooling, coordinate the fan auxiliary supply and control interfaces. Final clearances, transport dimensions and lifting details follow the approved project drawings.<\/p><\/div><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which network-duty details are needed?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Network duty<\/p><span class=\"site-condition-input\">Normal load, peak demand, load cycle and incoming-voltage variation<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Capacity, voltage ratio and regulation schedule<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which ambient conditions should be specified?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Ambient conditions<\/p><span class=\"site-condition-input\">Minimum and maximum temperature, altitude and available cooling airflow<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Thermal rating and insulation arrangement<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which surface exposures need review?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Surface exposure<\/p><span class=\"site-condition-input\">Dust, coastal salt and chemical or corrosive contaminants<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Tank coating, bushings and external insulation<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>What should be defined for cooling auxiliaries?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Cooling auxiliaries<\/p><span class=\"site-condition-input\">Fan supply, control connections and operating requirements after supply loss<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Forced-air cooling and temperature control<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which physical installation interfaces need checking?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Physical layout<\/p><span class=\"site-condition-input\">Foundation, terminal approach, access routes and maintenance space<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Overall drawing, transport and lifting arrangement<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which station protection interfaces are needed?<\/summary><div class=\"pd-faq-answer\"><p class=\"pd-faq-original-label\">Station protection<\/p><span class=\"site-condition-input\">Alarm, trip, indication and local\/remote control interfaces<\/span><div class=\"site-condition-body\"><p class=\"site-design-review\"><span>Design review<\/span>Accessory schedule and control-wiring connections<\/p><\/div><\/div><\/details><details class=\"pd-faq\" name=\"pd-faq-763\"><summary>Which technical documents and configuration records are available?<\/summary><div class=\"pd-faq-answer\"><div id=\"documents\"><span class=\"anchor-alias\" id=\"project-inquiry\" aria-hidden=\"true\"><\/span><p>A power-transformer specification brings the electrical design, cooling equipment and station interfaces into one package. Capacity and voltage ratio establish the basic duty; vector group and impedance connect the transformer to the network study; tap range and controls define regulation; the oil system and protection accessories define the operating arrangement.<\/p><div class=\"document-list\"><a class=\"document-row\" href=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-03-power-power-transformer-guide-4baa6128.pdf\" target=\"_blank\" rel=\"noopener\"><span><strong>Power Transformers \u2014 Selection Guide<\/strong><small>Subian \u00b7 Preliminary edition \u00b7 2 pages \u00b7 Applications and configuration topics<\/small><\/span><span class=\"document-action\">Open PDF <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/span><\/a><div class=\"document-row\"><span><strong>SZ On-load Tap-changing Transformers<\/strong><small>Main transformer HV ratings span 69\u2013130 kV, with a 132 kV option. ONAN with optional ONAF.<\/small><\/span><button type=\"button\" class=\"text-link\" data-open-product=\"power-sz-oltc\" data-start-tab=\"technical\">View technical data<svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><\/div><div class=\"document-row\"><span><strong>SZF Forced-air-cooled On-load Tap-changing Transformers<\/strong><small>Main transformer HV ratings span 69\u2013130 kV, with a 132 kV option. ONAF cooling.<\/small><\/span><button type=\"button\" class=\"text-link\" data-open-product=\"power-szf-oltc\" data-start-tab=\"technical\">View technical data<svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/button><\/div><a class=\"document-row\" href=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/subian-electric-35kv-cb-certificate.webp\" target=\"_blank\" rel=\"noopener\"><span><strong>CB Test Certificate \u2014 Power Transformer SZ22-31500\/35\/10.5<\/strong><small>JIANGSU SUBIAN POWER EQUIPMENT CO., LTD.; SZ22-31500\/35\/10.5; HU-006303; 9 March 2026; available page 1 only.<\/small><\/span><span class=\"document-action\">View document <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/span><\/a><a class=\"document-row\" href=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/subian-electric-35kv-ce-certificate.webp\" target=\"_blank\" rel=\"noopener\"><span><strong>Test Verification of Conformity \u2014 SZ22-31500\/35\/10.5<\/strong><small>JIANGSU SUBIAN POWER EQUIPMENT CO., LTD.; SZ22-31500\/35\/10.5; CN266T87 001; 9 March 2026; page 1 of 1.<\/small><\/span><span class=\"document-action\">View document <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/span><\/a><\/div><details class=\"model-code\"><summary>Document scope and configuration notes<span aria-hidden=\"true\">+<\/span><\/summary><div><p>For project engineering, the technical package should include the rated data sheet, tap schedule, terminal arrangement, overall drawing, foundation and lifting details, and protection\/control connections. Test documents must identify the actual model and rated configuration. This keeps the transformer data aligned with the civil, cable and protection design.<\/p><p>The available Power Transformers catalog is a two-page preliminary overview of applications and configuration options. The SZ panel also contains the two document copies for SZ22-31500\/35\/10.5. Model ratings and document scope remain attached to the named configuration when preparing the final engineering package.<\/p><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Available documents and project engineering package\"><table class=\"property-table\"><caption>Available documents and project engineering package<\/caption><thead><tr><th scope=\"col\">Document<\/th><th scope=\"col\">Scope<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Power Transformers \u2014 preliminary catalog<\/th><td>Two-page overview: applications, configuration topics and specification inputs<\/td><\/tr><tr><th scope=\"row\">CB Test Certificate HU-006303<\/th><td>Available first page for SZ22-31500\/35\/10.5; model ratings and applicant<\/td><\/tr><tr><th scope=\"row\">Test Verification of Conformity CN266T87 001<\/th><td>One-page copy for the named SZ22-31500\/35\/10.5 configuration<\/td><\/tr><tr><th scope=\"row\">Project data sheet and drawings<\/th><td>Ordered electrical duty, tap schedule, terminals, foundation, lifting and control connections<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>Published certificate copies apply to the named model and entity. The preliminary catalog is an overview, not a loss schedule or test report.<\/p><\/div><\/div><\/details><ul class=\"content-list\"><li>Rated power, primary and secondary voltages, frequency and vector group.<\/li><li>Load cycle, site ambient conditions and the required cooling arrangement.<\/li><li>On-load tap range, control requirements and station protection interfaces.<\/li><li>Quantity, installation location, applicable project standard and required technical documents.<\/li><\/ul><\/div><\/div><\/details><\/div><\/div><\/section>\n\n<dialog class=\"oil-modal\" id=\"modal-power-sz-oltc\" data-product-id=\"power-sz-oltc\" aria-labelledby=\"modal-power-sz-oltc-title\"><header><h2 id=\"modal-power-sz-oltc-title\" tabindex=\"-1\">SZ On-load Tap-changing Transformers<\/h2><button class=\"icon-button\" type=\"button\" data-close-modal aria-label=\"Close product details\"><svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"m6 6 12 12M18 6 6 18\"\/><\/svg><\/button><\/header><div class=\"modal-tabs\" role=\"tablist\" aria-label=\"Product details\"><button type=\"button\" role=\"tab\" id=\"modal-power-sz-oltc-tab-overview\" data-modal-tab=\"overview\" aria-controls=\"modal-power-sz-oltc-overview\" aria-selected=\"true\" tabindex=\"0\">Overview<\/button><button type=\"button\" role=\"tab\" id=\"modal-power-sz-oltc-tab-technical\" data-modal-tab=\"technical\" aria-controls=\"modal-power-sz-oltc-technical\" aria-selected=\"false\" tabindex=\"-1\">Technical data<\/button><\/div><div data-modal-scroll><div id=\"modal-power-sz-oltc-overview\" data-modal-panel=\"overview\" role=\"tabpanel\" aria-labelledby=\"modal-power-sz-oltc-tab-overview\" ><div class=\"modal-overview\"><div class=\"modal-gallery\"><div class=\"gallery-stage\"><img loading=\"lazy\" decoding=\"async\" data-gallery-main src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f068-960-578393ca.webp\" alt=\"SZ On-load Tap-changing Transformers \u2014 series photograph\" width=\"960\" height=\"960\"><\/div><div class=\"gallery-thumbs\"><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f068-960-578393ca.webp\" data-gallery-alt=\"SZ On-load Tap-changing Transformers \u2014 view 1\" data-gallery-caption=\"SZ-series equipment and construction examples.\" aria-label=\"View product photo 1\" aria-pressed=\"true\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f068-480-5037558c.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-960-44b8ae1f.webp\" data-gallery-alt=\"SZ On-load Tap-changing Transformers \u2014 view 2\" data-gallery-caption=\"SZ-series equipment and construction examples.\" aria-label=\"View product photo 2\" aria-pressed=\"false\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f063-480-25cb3575.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f064-960-b8c301bd.webp\" data-gallery-alt=\"SZ On-load Tap-changing Transformers \u2014 view 3\" data-gallery-caption=\"SZ-series equipment and construction examples.\" aria-label=\"View product photo 3\" aria-pressed=\"false\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f064-480-081e166d.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f066-960-6fc79483.webp\" data-gallery-alt=\"SZ On-load Tap-changing Transformers \u2014 view 4\" data-gallery-caption=\"SZ-series equipment and construction examples.\" aria-label=\"View product photo 4\" aria-pressed=\"false\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f066-480-7dc2684a.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-960-849b8f8e.webp\" data-gallery-alt=\"SZ On-load Tap-changing Transformers \u2014 view 5\" data-gallery-caption=\"SZ-series equipment and construction examples.\" aria-label=\"View product photo 5\" aria-pressed=\"false\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f067-480-4c3a6c7c.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><\/div><p data-gallery-caption-text class=\"photo-caption\">Series construction photograph.<\/p><\/div><div><p>The SZ series regulates the voltage ratio under load. Main transformer configurations have a high-voltage side rated 69\u2013130 kV. 130 kV and 132 kV are distinct ratings selected to suit the applicable project standard.<\/p><p>The core is built from grain-oriented silicon-steel laminations with multistep, fully mitered joints. Oxygen-free copper windings use continuous or interleaved construction. The main welded steel tank holds the insulating oil, while an independent tap-changer oil compartment separates the switching oil from the main transformer oil.<\/p><p>ONAN is the standard cooling arrangement; ONAF is an available design option. Conservator, gas relay, pressure-relief valve, oil-level indicator and temperature controller are listed accessories. Their selection follows the oil-system and station-protection arrangement.<\/p><p>The additional SZ22-31500\/35\/10.5 table below describes one separately documented 31.5 MVA configuration. Its 50 Hz rating and \u00b13 \u00d7 2.5% tap range are specific to that model. The linked document copies name JIANGSU SUBIAN POWER EQUIPMENT CO., LTD.; the series photographs illustrate SZ construction rather than identifying the tested specimen.<\/p><p>A separate 10 MVA SZ11 reference configuration uses 35\/10.5 kV, YNd11 and a \u00b18 \u00d7 1.25% HV tap schedule. Its published typical loss ranges are 8\u201312 kW at no load and 45\u201355 kW at a 75 \u00b0C load-loss reference temperature. ONAN and ONAF are listed design options; the project data sheet assigns the final loss values and cooling rating.<\/p><dl class=\"modal-facts\"><div><dt>Series<\/dt><dd>SZ11 \/ SZ13 \/ SZ20<\/dd><\/div><div><dt>Capacity range<\/dt><dd>6,300\u201350,000 kVA<\/dd><\/div><div><dt>Regulation<\/dt><dd>On-load tap changing<\/dd><\/div><div><dt>Cooling<\/dt><dd>ONAN; ONAF optional<\/dd><\/div><\/dl><\/div><\/div><\/div><div id=\"modal-power-sz-oltc-technical\" data-modal-panel=\"technical\" role=\"tabpanel\" aria-labelledby=\"modal-power-sz-oltc-tab-technical\" hidden><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZ series electrical and configuration data\"><table class=\"property-table\"><caption>SZ series electrical and configuration data<\/caption><thead><tr><th scope=\"col\">Property<\/th><th scope=\"col\">Series specification<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Model Series<\/th><td>SZ11 \/ SZ13 \/ SZ20<\/td><\/tr><tr><th scope=\"row\">Rated Capacity<\/th><td>6,300\u201350,000 kVA<\/td><\/tr><tr><th scope=\"row\">Rated Frequency<\/th><td>50Hz \/ 60Hz<\/td><\/tr><tr><th scope=\"row\">HV Voltage<\/th><td>69\u2013130 kV. 132 kV available where specified by the project standard.<\/td><\/tr><tr><th scope=\"row\">LV Voltage<\/th><td>Specified to match the secondary network<\/td><\/tr><tr><th scope=\"row\">Vector Group<\/th><td>Specified for the winding arrangement and network<\/td><\/tr><tr><th scope=\"row\">Cooling Method<\/th><td>ONAN (Oil Natural Air Natural); ONAF optional<\/td><\/tr><tr><th scope=\"row\">Regulation Mode<\/th><td>OLTC, on-load voltage regulation (no shutdown required)<\/td><\/tr><tr><th scope=\"row\">Standards<\/th><td>IEC 60076, GB\/T 6451<\/td><\/tr><tr><th scope=\"row\">Temperature Rise Limit<\/th><td>Specified for the selected rating and cooling duty<\/td><\/tr><tr><th scope=\"row\">Optional Accessories<\/th><td>Conservator, gas relay, pressure relief valve, oil level indicator, temperature controller<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>The capacity range and selectable voltages describe the series. They do not establish every capacity, voltage and vector-group combination.<\/p><p>Top-oil temperature rise is a design criterion above ambient; the rated duty, cooling arrangement and acceptance conditions belong to the individual order specification.<\/p><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZ22-31500\/35\/10.5 \u2014 published configuration\"><table class=\"property-table\"><caption>SZ22-31500\/35\/10.5 \u2014 published configuration<\/caption><thead><tr><th scope=\"col\">Property<\/th><th scope=\"col\">Value<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Model<\/th><td>SZ22-31500\/35\/10.5<\/td><\/tr><tr><th scope=\"row\">Rated power<\/th><td>31,500 kVA<\/td><\/tr><tr><th scope=\"row\">Rated voltage, HV \/ LV<\/th><td>35 \/ 10.5 kV<\/td><\/tr><tr><th scope=\"row\">HV tapping range<\/th><td>\u00b13 \u00d7 2.5%<\/td><\/tr><tr><th scope=\"row\">Rated frequency<\/th><td>50 Hz<\/td><\/tr><tr><th scope=\"row\">Rated current, HV \/ LV<\/th><td>519.6 \/ 1,732.1 A<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>These ratings and the \u00b13 \u00d7 2.5% tapping range apply to the documented SZ22 configuration.<\/p><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"Common electrical fields\"><table class=\"property-table\"><caption>Common electrical fields<\/caption><thead><tr><th scope=\"col\">Property<\/th><th scope=\"col\">Value<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Reference model<\/th><td>SZ11-10000\/35\/10.5<\/td><\/tr><tr><th scope=\"row\">HV \/ LV voltage (kV)<\/th><td>35 \/ 10.5<\/td><\/tr><tr><th scope=\"row\">Reference frequency (Hz)<\/th><td>50<\/td><\/tr><tr><th scope=\"row\">Vector group<\/th><td>YNd11<\/td><\/tr><tr><th scope=\"row\">HV tap range<\/th><td>\u00b18 \u00d7 1.25%<\/td><\/tr><tr><th scope=\"row\">Cooling design options<\/th><td>ONAN \/ ONAF<\/td><\/tr><tr><th scope=\"row\">Load-loss reference temperature (\u00b0C)<\/th><td>75<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><\/div><div class=\"rating-toolbar\"><label>Rated capacity<select data-capacity-filter><option value=\"\">All capacities<\/option><option value=\"10000\">10000 kVA<\/option><\/select><\/label><p data-filter-status aria-live=\"polite\">1 ratings<\/p><\/div><p class=\"scroll-hint\">Scroll across the table to view every loss and impedance column.<\/p><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZ11 \u00b7 10 MVA \u00b7 35\/10.5 kV reference configuration\"><table data-rating-matrix><caption>SZ11 \u00b7 10 MVA \u00b7 35\/10.5 kV reference configuration<\/caption><thead><tr><th scope=\"col\">Rated capacity (kVA)<\/th><th scope=\"col\">Typical no-load loss (kW)<\/th><th scope=\"col\">Typical load loss at 75 \u00b0C (kW)<\/th><th scope=\"col\">Typical no-load current (%)<\/th><th scope=\"col\">Typical impedance (%)<\/th><\/tr><\/thead><tbody><tr data-capacity=\"10000\"><th scope=\"row\">10000<\/th><td>8\u201312<\/td><td>45\u201355<\/td><td>0.6\u20130.9<\/td><td>7.5\u20138<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>Typical configuration values; final losses, tap schedule and cooling rating follow the project data sheet.<\/p><p>ONAN and ONAF are design options here; the source does not assign a separate kVA rating to each cooling mode. The 75 \u00b0C value is the load-loss reference temperature.<\/p><\/div><p class=\"table-source\">Published SZ11 10 MVA configuration<\/p><a class=\"document-row\" href=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/subian-electric-35kv-cb-certificate.webp\" target=\"_blank\" rel=\"noopener\"><span><strong>CB Test Certificate \u2014 Power Transformer SZ22-31500\/35\/10.5<\/strong><small>JIANGSU SUBIAN POWER EQUIPMENT CO., LTD.; SZ22-31500\/35\/10.5; HU-006303; 9 March 2026; available page 1 only.<\/small><\/span><span class=\"document-action\">View document <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/span><\/a><a class=\"document-row\" href=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/subian-electric-35kv-ce-certificate.webp\" target=\"_blank\" rel=\"noopener\"><span><strong>Test Verification of Conformity \u2014 SZ22-31500\/35\/10.5<\/strong><small>JIANGSU SUBIAN POWER EQUIPMENT CO., LTD.; SZ22-31500\/35\/10.5; CN266T87 001; 9 March 2026; page 1 of 1.<\/small><\/span><span class=\"document-action\">View document <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/span><\/a><\/div><\/div><footer><a class=\"text-link modal-document-link\" href=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-03-power-power-transformer-guide-4baa6128.pdf\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open series guide PDF\">Family overview (PDF) <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/a><a href=\"#\" class=\"button\" data-inquiry>Request a quotation <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/a><\/footer><\/dialog>\n<dialog class=\"oil-modal\" id=\"modal-power-szf-oltc\" data-product-id=\"power-szf-oltc\" aria-labelledby=\"modal-power-szf-oltc-title\"><header><h2 id=\"modal-power-szf-oltc-title\" tabindex=\"-1\">SZF Forced-air-cooled On-load Tap-changing Transformers<\/h2><button class=\"icon-button\" type=\"button\" data-close-modal aria-label=\"Close product details\"><svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"m6 6 12 12M18 6 6 18\"\/><\/svg><\/button><\/header><div class=\"modal-tabs\" role=\"tablist\" aria-label=\"Product details\"><button type=\"button\" role=\"tab\" id=\"modal-power-szf-oltc-tab-overview\" data-modal-tab=\"overview\" aria-controls=\"modal-power-szf-oltc-overview\" aria-selected=\"true\" tabindex=\"0\">Overview<\/button><button type=\"button\" role=\"tab\" id=\"modal-power-szf-oltc-tab-technical\" data-modal-tab=\"technical\" aria-controls=\"modal-power-szf-oltc-technical\" aria-selected=\"false\" tabindex=\"-1\">Technical data<\/button><\/div><div data-modal-scroll><div id=\"modal-power-szf-oltc-overview\" data-modal-panel=\"overview\" role=\"tabpanel\" aria-labelledby=\"modal-power-szf-oltc-tab-overview\" ><div class=\"modal-overview\"><div class=\"modal-gallery\"><div class=\"gallery-stage\"><img loading=\"lazy\" decoding=\"async\" data-gallery-main src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-960-225b2906.webp\" alt=\"SZF Forced-air-cooled On-load Tap-changing Transformers \u2014 series photograph\" width=\"960\" height=\"960\"><\/div><div class=\"gallery-thumbs\"><button type=\"button\" data-gallery-src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-960-225b2906.webp\" data-gallery-alt=\"SZF Forced-air-cooled On-load Tap-changing Transformers \u2014 view 1\" data-gallery-caption=\"Series construction photograph.\" aria-label=\"View product photo 1\" aria-pressed=\"true\"><img decoding=\"async\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-transformers-20261025-f071-480-3cb1baf9.webp\" alt=\"\" width=\"90\" height=\"80\" loading=\"lazy\"><\/button><\/div><p data-gallery-caption-text class=\"photo-caption\">Series construction photograph.<\/p><\/div><div><p>The SZF series combines on-load tap changing with forced-air radiator cooling. Main transformer configurations have a high-voltage side rated 69\u2013130 kV. 130 kV and 132 kV are distinct ratings selected to suit the applicable project standard.<\/p><p>Radiator fans increase airflow over the cooling surfaces while the oil circulates naturally. Temperature control starts and stops the fans according to cooling demand. This arrangement is used for substations and industrial installations with sustained heavy loading; the rated output remains tied to the specified ambient conditions and cooling duty.<\/p><p>The active part uses a laminated, fully mitered grain-oriented silicon-steel core and oxygen-free copper windings. The tap changer has a separate oil compartment. A welded steel tank, anti-corrosion coating and ageing-resistant seals complete the outdoor construction.<\/p><p>The protection and accessory arrangement can include a conservator, gas relay, pressure-relief valve, oil-level indicator and temperature controller together with the cooling-fan assembly. Fan quantity, motor supply and control wiring are determined by the actual cooling design.<\/p><dl class=\"modal-facts\"><div><dt>Series<\/dt><dd>SZF11 \/ SZF13 \/ SZF20<\/dd><\/div><div><dt>Capacity range<\/dt><dd>6,300\u201350,000 kVA<\/dd><\/div><div><dt>Regulation<\/dt><dd>On-load tap changing<\/dd><\/div><div><dt>Cooling<\/dt><dd>ONAF \u2014 Oil Natural Air Forced<\/dd><\/div><\/dl><\/div><\/div><\/div><div id=\"modal-power-szf-oltc-technical\" data-modal-panel=\"technical\" role=\"tabpanel\" aria-labelledby=\"modal-power-szf-oltc-tab-technical\" hidden><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZF series electrical and configuration data\"><table class=\"property-table\"><caption>SZF series electrical and configuration data<\/caption><thead><tr><th scope=\"col\">Property<\/th><th scope=\"col\">Series specification<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Model Series<\/th><td>SZF11 \/ SZF13 \/ SZF20<\/td><\/tr><tr><th scope=\"row\">Rated Capacity<\/th><td>6,300\u201350,000 kVA<\/td><\/tr><tr><th scope=\"row\">Rated Frequency<\/th><td>50Hz \/ 60Hz<\/td><\/tr><tr><th scope=\"row\">HV Voltage<\/th><td>69\u2013130 kV. 132 kV available where specified by the project standard.<\/td><\/tr><tr><th scope=\"row\">LV Voltage<\/th><td>Specified to match the secondary network<\/td><\/tr><tr><th scope=\"row\">Vector Group<\/th><td>Specified for the winding arrangement and network<\/td><\/tr><tr><th scope=\"row\">Cooling Method<\/th><td>ONAF (Oil Natural Air Forced)<\/td><\/tr><tr><th scope=\"row\">Regulation Mode<\/th><td>OLTC, on-load voltage regulation (no shutdown required)<\/td><\/tr><tr><th scope=\"row\">Standards<\/th><td>IEC 60076, GB\/T 6451<\/td><\/tr><tr><th scope=\"row\">Temperature Rise Limit<\/th><td>Specified for the selected rating and cooling duty<\/td><\/tr><tr><th scope=\"row\">Optional Accessories<\/th><td>Conservator, gas relay, pressure relief valve, oil level indicator, temperature controller, cooling fan assembly<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>The capacity range and selectable voltages describe the series. They do not establish every capacity, voltage and vector-group combination.<\/p><p>Top-oil temperature rise is a design criterion above ambient; the rated duty, cooling arrangement and acceptance conditions belong to the individual order specification.<\/p><\/div><div class=\"table-wrap\" role=\"region\" tabindex=\"0\" aria-label=\"SZF cooling and control specification\"><table class=\"property-table\"><caption>SZF cooling and control specification<\/caption><thead><tr><th scope=\"col\">Engineering item<\/th><th scope=\"col\">Configuration detail<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Oil \/ air circulation<\/th><td>Natural oil circulation with forced radiator airflow<\/td><\/tr><tr><th scope=\"row\">Fan operation<\/th><td>Automatic start and stop by temperature control<\/td><\/tr><tr><th scope=\"row\">Cooling capacity<\/th><td>Rated output defined for the selected ambient conditions and cooling duty<\/td><\/tr><tr><th scope=\"row\">Auxiliary supply<\/th><td>Fan-motor supply and control connections specified with the station design<\/td><\/tr><tr><th scope=\"row\">Oil supervision<\/th><td>Temperature, oil-level and gas-protection devices selected for the oil system<\/td><\/tr><tr><th scope=\"row\">Protection interfaces<\/th><td>Alarm and trip contacts coordinated with the selected devices and station scheme<\/td><\/tr><\/tbody><\/table><\/div><div class=\"table-notes\"><p>Fan quantity, motor ratings and temperature settings follow the selected cooling design. Losses and impedance are specified for the ordered SZF configuration.<\/p><\/div><\/div><\/div><footer><a class=\"text-link modal-document-link\" href=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/10\/subia-03-power-power-transformer-guide-4baa6128.pdf\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open series guide PDF\">Family overview (PDF) <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"\/><\/svg><\/a><a href=\"#\" class=\"button\" data-inquiry>Request a quotation <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 12h15m-6-6 6 6-6 6\"\/><\/svg><\/a><\/footer><\/dialog>\n<\/div>\n\n<script src=\"https:\/\/subiapower.com\/wp-content\/plugins\/subia-alpha-closeout\/cache\/8edd70a37a8316e690a5.js\" id=\"subia-oil-template-runtime\" data-subia-cache=\"a8fced6708ae\"><\/script>\n\n<link rel=\"stylesheet\" href=\"https:\/\/subiapower.com\/wp-content\/plugins\/subia-alpha-closeout\/cache\/0db60f15c74518e5317d.css\" 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.wp-block-post-title{font-size:20px;padding:22px}}\n<\/style>\n\n\n<section id=\"detail-guides-763\" class=\"wp-block-group alignfull pd-guides is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group pd-guides-rail is-layout-flow wp-block-group-is-layout-flow\">\n<header class=\"pd-guides-heading\"><h2>Power Transformer Technical Guides<\/h2><a href=\"https:\/\/subiapower.com\/resources\/\">View all resources<\/a><\/header>\n\n<div class=\"wp-block-query pd-guides-query is-layout-flow wp-block-query-is-layout-flow\">\n<ul class=\"columns-3 wp-block-post-template is-layout-grid wp-container-core-post-template-is-layout-18ef8054 wp-block-post-template-is-layout-grid\"><li class=\"wp-block-post post-1869 post type-post status-publish format-standard has-post-thumbnail hentry category-technical-resources\">\n<figure class=\"wp-block-post-featured-image\"><a href=\"https:\/\/subiapower.com\/es\/on-load-vs-de-energized-tap-changers-choosing-voltage-regulation\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20-1024x683.webp\" class=\"attachment-large size-large wp-post-image\" alt=\"On-Load vs De-Energized Tap Changers: Choosing Voltage Regulation\" style=\"aspect-ratio:3\/2;width:100%;object-fit:contain;\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20-1024x683.webp 1024w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20-300x200.webp 300w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20-768x512.webp 768w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20-18x12.webp 18w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-20.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<h3 class=\"wp-block-post-title\"><a href=\"https:\/\/subiapower.com\/es\/on-load-vs-de-energized-tap-changers-choosing-voltage-regulation\/\" target=\"_self\">On-Load vs De-Energized Tap Changers: Choosing Voltage Regulation<\/a><\/h3>\n<div class=\"wp-block-post-excerpt\"><p class=\"wp-block-post-excerpt__excerpt\">Choose between on-load and de-energized tap changing using the site voltage envelope, acceptable outages and control requirements.<\/p><p class=\"wp-block-post-excerpt__more-text\"><a class=\"wp-block-post-excerpt__more-link\" href=\"https:\/\/subiapower.com\/es\/on-load-vs-de-energized-tap-changers-choosing-voltage-regulation\/\">Read guide<\/a><\/p><\/div>\n<\/li><li class=\"wp-block-post post-1987 post type-post status-publish format-standard has-post-thumbnail hentry category-technical-resources\">\n<figure class=\"wp-block-post-featured-image\"><a href=\"https:\/\/subiapower.com\/es\/50-hz-vs-60-hz-transformers-voltage-frequency-and-nameplate-compatibility\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30-1024x683.webp\" class=\"attachment-large size-large wp-post-image\" alt=\"50 Hz vs 60 Hz Transformers: Voltage, Frequency and Nameplate Compatibility\" style=\"aspect-ratio:3\/2;width:100%;object-fit:contain;\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30-1024x683.webp 1024w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30-300x200.webp 300w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30-768x512.webp 768w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30-18x12.webp 18w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-30.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<h3 class=\"wp-block-post-title\"><a href=\"https:\/\/subiapower.com\/es\/50-hz-vs-60-hz-transformers-voltage-frequency-and-nameplate-compatibility\/\" target=\"_self\">50 Hz vs 60 Hz Transformers: Voltage, Frequency and Nameplate Compatibility<\/a><\/h3>\n<div class=\"wp-block-post-excerpt\"><p class=\"wp-block-post-excerpt__excerpt\">Use one transformer example to check volts per hertz, loaded secondary voltage and the evidence required for an exact voltage and frequency&hellip;<\/p><p class=\"wp-block-post-excerpt__more-text\"><a class=\"wp-block-post-excerpt__more-link\" href=\"https:\/\/subiapower.com\/es\/50-hz-vs-60-hz-transformers-voltage-frequency-and-nameplate-compatibility\/\">Read guide<\/a><\/p><\/div>\n<\/li><li class=\"wp-block-post post-1820 post type-post status-publish format-standard has-post-thumbnail hentry category-technical-resources\">\n<figure class=\"wp-block-post-featured-image\"><a href=\"https:\/\/subiapower.com\/es\/transformer-impedance-explained-fault-current-voltage-drop-and-selection\/\" target=\"_self\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13-1024x683.webp\" class=\"attachment-large size-large wp-post-image\" alt=\"Transformer Impedance Explained: Fault Current, Voltage Drop and Selection\" style=\"aspect-ratio:3\/2;width:100%;object-fit:contain;\" srcset=\"https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13-1024x683.webp 1024w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13-300x200.webp 300w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13-768x512.webp 768w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13-18x12.webp 18w, https:\/\/subiapower.com\/wp-content\/uploads\/2026\/11\/featured-final-13.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<h3 class=\"wp-block-post-title\"><a href=\"https:\/\/subiapower.com\/es\/transformer-impedance-explained-fault-current-voltage-drop-and-selection\/\" target=\"_self\">Transformer Impedance Explained: Fault Current, Voltage Drop and Selection<\/a><\/h3>\n<div class=\"wp-block-post-excerpt\"><p class=\"wp-block-post-excerpt__excerpt\">How to read transformer percent impedance and use it in fault-current and voltage-performance comparisons.<\/p><p class=\"wp-block-post-excerpt__more-text\"><a class=\"wp-block-post-excerpt__more-link\" href=\"https:\/\/subiapower.com\/es\/transformer-impedance-explained-fault-current-voltage-drop-and-selection\/\">Read guide<\/a><\/p><\/div>\n<\/li><\/ul>\n<\/div>\n\n<\/div>\n<\/section>\n\n\n<style id=\"product-sec-alignment-763\">\n\/* 763 only: independently adapted SZ \/ SZF sections; original hero and media crop rules stay intact. *\/\nbody.page-id-763 #subia-oil-template.pd-exhibition{--slate:#102f3a;--teal:#14757a;--orange:#f47216}\nbody.page-id-763 #subia-oil-template.pd-exhibition 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16px;background:transparent;text-align:start;color:#415b65}\n body.page-id-763 #subia-oil-template.pd-exhibition :is(#on-load-voltage-regulation,#power-construction-design,#power-electrical-review) table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}\n body.page-id-763 #subia-oil-template.pd-exhibition :is(#on-load-voltage-regulation,#power-construction-design,#power-electrical-review) table tbody{display:block}\n body.page-id-763 #subia-oil-template.pd-exhibition :is(#on-load-voltage-regulation,#power-construction-design,#power-electrical-review) table tbody tr{display:block;padding:16px;border-bottom:1px solid #c6d7da;background:#fff}\n body.page-id-763 #subia-oil-template.pd-exhibition :is(#on-load-voltage-regulation,#power-construction-design,#power-electrical-review) table tbody 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.rail,\nbody.page-id-763 #post-763 .entry-content #detail-guides-763 .pd-guides-rail{width:min(calc(100% - 40px),1350px)!important}}\n\n\/* Match the oil template's tablet layout for applications and related guides. *\/\n@media (min-width: 1001px) and (max-width: 1200px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-explorer.is-interactive {\n    grid-template-columns: minmax(0, 63fr) minmax(0, 37fr);\n    gap: 32px;\n  }\n}\n@media (min-width: 768px) and (max-width: 1000px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-explorer.is-interactive {\n    grid-template-columns: minmax(0, 60fr) minmax(0, 40fr);\n    gap: 24px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab {\n    grid-template-columns: 68px minmax(0, 1fr);\n    gap: 14px;\n    min-height: 102px;\n    padding: 18px 12px;\n    font-size: 16px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab img { width: 68px; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab > svg { display: none; }\n}\n@media (min-width: 700px) and (max-width: 767px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab {\n    width: 226px;\n    flex: 0 0 226px;\n    grid-template-columns: 54px minmax(0, 1fr);\n    gap: 12px;\n    min-height: 80px;\n    padding: 14px 12px;\n    font-size: 14px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab img { width: 54px; }\n}\n@media (min-width: 700px) and (max-width: 1099px) {\n  body.page-id-763 #post-763 .entry-content #detail-guides-763 .wp-block-post-template {\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 24px;\n  }\n  body.page-id-763 #post-763 .entry-content #detail-guides-763 .wp-block-post-title { padding: 22px 22px 16px; }\n  body.page-id-763 #post-763 .entry-content #detail-guides-763 .wp-block-post-excerpt { padding: 0 22px 22px; }\n}\n\n\/* Align the first two notes with the tablet device cards. *\/\n@media (min-width: 700px) and (max-width: 1100px) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy {\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 24px 18px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy > :last-child {\n    grid-column: 1 \/ -1;\n  }\n}\n<\/style>\n\n\n\n<style id=\"product-style-fidelity-763\">\n\/* SEC2 763: oil-reference heading, cards and interaction. *\/\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section {\n  padding-block: 64px 74px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading {\n  display: grid;\n  grid-template-columns: repeat(2, minmax(0, 1fr));\n  align-items: end;\n  gap: 60px;\n  margin-bottom: 40px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading h2 {\n  max-width: 18ch;\n  margin: 0;\n  padding-block-start: 22px;\n  color: #102f3a;\n  font-size: 34px;\n  font-weight: 700;\n  line-height: 1.12;\n  letter-spacing: -.035em;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading > p {\n  max-width: 53ch;\n  margin: 0;\n  padding: 7px 0 0;\n  color: #344951;\n  font-size: 16px;\n  font-weight: 400;\n  line-height: 1.75;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product {\n  border: 1px solid #d6e2e5;\n  border-radius: 8px;\n  background: #f3f7f8;\n  box-shadow: none;\n  transition: border-color .18s ease, box-shadow .18s ease;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product:is(:hover, :focus-within) {\n  border-color: #8eb7bc;\n  background: #f3f7f8;\n  box-shadow: 0 8px 24px rgba(16, 47, 58, .07);\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product h3 {\n  max-width: none;\n  color: #102f3a;\n  font-size: 23px;\n  font-weight: 600;\n  line-height: 1.3;\n  text-wrap: balance;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .series-range {\n  color: #14757a;\n  font-size: 13px;\n  font-weight: 500;\n  line-height: 1.6;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product :is(.sc-card-description > p, .series-copy > p:not(.series-range)),\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product > p:not(.series-range, .rd-capacity) {\n  color: #344951;\n  font-size: 14px;\n  line-height: 1.7;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .sc-card-action > .text-link {\n  display: flex;\n  align-items: center;\n  justify-content: space-between;\n  gap: 16px;\n  width: 100%;\n  min-height: 46px;\n  padding: 11px 15px;\n  border: 1px solid #b8cfd3;\n  border-radius: 4px;\n  background: #fff;\n  color: #14757a;\n  font-size: 14px;\n  font-weight: 550;\n  line-height: 1.55;\n  text-align: start;\n  white-space: normal;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .sc-card-action > .text-link:hover {\n  border-color: #14757a;\n  background: #14757a;\n  color: #fff;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .sc-card-action > .text-link svg {\n  flex-shrink: 0;\n  transition: transform .2s ease;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .sc-card-action > .text-link:hover svg {\n  transform: translateX(4px);\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product :is(.product-photo, .text-link):focus-visible {\n  outline: 3px solid #f47216;\n  outline-offset: 4px;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid {\n  grid-template-columns: repeat(2, minmax(0, 1fr));\n  gap: 24px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product {\n  padding: 26px;\n}\n@media (min-width: 960px) and (max-width: 1100px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product { padding: 22px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product h3 { font-size: 21px; }\n}\n@media (min-width: 700px) and (max-width: 959px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product h3 { font-size: 22px; }\n}\n@media (max-width: 699px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid { grid-template-columns: minmax(0, 1fr); gap: 22px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product { padding: 22px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product h3 { min-height: 0; }\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product > :is(.ex-series-code, .rd-capacity) {\n  font-variant-numeric: lining-nums tabular-nums;\n}\nbody.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product > .sc-card-media > .sc-art {\n  inset-block: 28px 0;\n  inset-inline: 0;\n  width: auto;\n  height: auto;\n}\n@media (min-width: 601px) and (max-width: 900px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product > .sc-card-media { height: 190px; }\n}\n@media (max-width: 600px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product > .sc-card-media > .sc-art { inset-block-start: 24px; inset-inline: 10px; }\n}\n\n@media (min-width: 601px) and (max-width: 900px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading { gap: 35px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading h2 { font-size: 32px; }\n}\n@media (min-width: 601px) and (max-width: 699px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading > p { padding-top: 0; line-height: 1.8; }\n}\n@media (max-width: 600px) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section { padding-block: 44px 52px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading { display: block; margin-bottom: 32px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading h2 { margin-bottom: 20px; font-size: 30px; }\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section .section-heading > p { padding-top: 0; font-size: 15px; line-height: 1.8; }\n}\n@media (prefers-reduced-motion: reduce) {\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product,\n  body.page-id-763 #post-763 #subia-oil-template #series.sc-section > .rail > .series-grid > .series-product .sc-card-action > .text-link svg {\n    transition: none;\n  }\n}\n\n\/* Electrical comparison heading. *\/\nbody.page-id-763 #post-763 #subia-oil-template #electrical-range > .rail > .balanced-heading {\n  font-size: clamp(32px, 3.1vw, 44px);\n  font-weight: 600;\n  line-height: 1.12;\n  margin-block-end: 16px;\n}\n@media (max-width: 600px) {\n  body.page-id-763 #post-763 #subia-oil-template #electrical-range > .rail > .balanced-heading { font-size: 30px; }\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #electrical-range .model-code > summary {\n  align-items: center;\n  column-gap: 14px;\n  padding-inline-end: 12px;\n  overflow-wrap: anywhere;\n}\nbody.page-id-763 #post-763 #subia-oil-template #electrical-range .model-code > summary > span {\n  display: grid;\n  place-items: center;\n  flex: 0 0 24px;\n  block-size: 24px;\n  line-height: 1;\n}\n\n\/* Construction heading and image\/text rails. *\/\nbody.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-title { font-size: clamp(34px, 3.1vw, 44px); font-weight: 600; }\n@media (min-width: 901px) and (max-width: 1100px) {\n  body.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-editorial {\n    grid-template-columns: minmax(0, 46fr) minmax(0, 54fr);\n    gap: 24px 32px;\n  }\n}\n@media (max-width: 900px) {\n  body.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-title { font-size: 40px; }\n}\n@media (max-width: 600px) {\n  body.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-title { font-size: 32px; }\n  body.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-editorial { gap: 25px; }\n}\n@media (max-width: 360px) {\n  body.page-id-763 #post-763 #subia-oil-template #on-load-voltage-regulation .construction-title { font-size: 29px; }\n}\n\n\/* Technical model triggers use the reference's rating CTA treatment. *\/\nbody.page-id-763 #post-763 #subia-oil-template #power-electrical-review .action-row > .text-link[data-open-product] {\n  display: inline-flex;\n  align-items: center;\n  justify-content: center;\n  gap: 14px;\n  min-height: 46px;\n  max-width: 100%;\n  padding: 12px 18px;\n  border: 0;\n  border-radius: 0;\n  box-shadow: none;\n  background: #14757a;\n  color: #fff;\n  font-size: 14px;\n  line-height: 1.4;\n  text-align: center;\n  text-decoration: none;\n  white-space: normal;\n}\nbody.page-id-763 #post-763 #subia-oil-template #power-electrical-review .action-row > .text-link[data-open-product]:hover { background: #105c62; }\nbody.page-id-763 #post-763 #subia-oil-template #power-electrical-review .action-row > .text-link[data-open-product] svg { width: 18px; height: 18px; stroke-width: 1.5; }\n@media (max-width: 600px) {\n  body.page-id-763 #post-763 #subia-oil-template #power-electrical-review .action-row > .text-link[data-open-product] { width: 100%; }\n}\n\n\/* Application heading and responsive spacing. *\/\nbody.page-id-763 #post-763 #subia-oil-template #applications .section-heading > h2 {\n  font-size: clamp(34px, 3.3vw, 48px);\n  font-weight: 600;\n  line-height: 1.08;\n}\n@media (min-width: 768px) and (max-width: 991px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications { padding-block: 72px; }\n}\n@media (max-width: 767px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .section-heading > h2 { font-size: 32px; }\n}\n@media (max-width: 359px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .section-heading > h2 { font-size: 29px; }\n}\n\/* Give the tablet selector the same rail as the photo without cropping either. *\/\n@media (min-width: 768px) and (max-width: 991px) {\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-explorer.is-interactive { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-explorer.is-interactive .app-panel-image { align-self: start; min-height: 0; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-explorer.is-interactive .app-panel-image img { display: block; width: 100%; height: auto; min-height: 0; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab {\n    grid-template-columns: 58px minmax(0, 1fr);\n    gap: 12px;\n    min-height: 92px;\n    padding: 20px 12px;\n    font-size: 15px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab img { width: 58px; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-tab > svg { display: none; }\n  body.page-id-763 #post-763 #subia-oil-template #applications .app-panel-copy h3 { font-size: 24px; }\n}\n\n\/* Match the FAQ and guide headings; leave accordion and media styling intact. *\/\nbody.page-id-763 #post-763 #subia-oil-template #site-conditions .pd-faq-heading > h2 { font-weight: 600; max-width: 13ch; }\nbody.page-id-763 #post-763 #detail-guides-763 .pd-guides-heading > h2 { font-weight: 600; max-width: 15ch; }\n@media (max-width: 699px) {\n  body.page-id-763 #post-763 #subia-oil-template #site-conditions .pd-faq-heading > h2 { max-width: 15ch; }\n  body.page-id-763 #post-763 #detail-guides-763 .pd-guides-heading > h2 { margin-block-end: 18px; }\n}\n<\/style>\n\n\n\n<style id=\"product-dark-divider-763\">\n@media screen {\n\/* Power Transformer SEC6. Match the oil template's protection heading and equipment icon treatment. *\/\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection {\n  --monitor-copy: #bed2d8;\n  --monitor-accent: #91d7cb;\n  --monitor-intro-gap: 48px;\n  --monitor-icon-size: 32px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection > .rail { position: relative; }\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection > .rail > .balanced-heading {\n  letter-spacing: -.035em;\n  text-wrap: balance;\n  margin-block-end: 14px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices caption {\n  color: var(--monitor-copy);\n  font-size: 15px;\n  line-height: 1.65;\n  max-inline-size: 48ch;\n  padding-block-end: 24px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody th {\n  gap: 14px;\n  min-height: 82px;\n  line-height: 1.35;\n  letter-spacing: -.015em;\n  overflow-wrap: anywhere;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody td {\n  color: #103744;\n  font-size: 15px;\n  line-height: 1.55;\n  padding: 20px 22px 22px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy { margin-block-start: 28px; }\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy h3 {\n  color: var(--monitor-copy);\n  line-height: 1.4;\n  margin-block-end: 10px;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy p {\n  color: var(--monitor-copy);\n  font-size: 13px;\n  line-height: 1.7;\n}\nbody.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection ::selection {\n  color: #102f3a;\n  background: var(--monitor-accent);\n}\n@supports ((mask-image: url(\"\")) or (-webkit-mask-image: url(\"\"))) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody th::before {\n    content: \"\";\n    flex: 0 0 var(--monitor-icon-size);\n    block-size: var(--monitor-icon-size);\n    background: var(--monitor-accent);\n    -webkit-mask: var(--monitor-device-icon) center \/ contain no-repeat;\n    mask: var(--monitor-device-icon) center \/ contain no-repeat;\n  }\n  \/* Temperature controller *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(1) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Cpath d%3D%22M14 4v10.54a4 4 0 1 1-4 0V4a2 2 0 0 1 4 0Z%22%2F%3E%3C%2Fsvg%3E\");\n  }\n  \/* Oil-level indicator *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(2) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Cpath d%3D%22M7 16.3c2.2 0 4-1.83 4-4.05 0-1.16-.57-2.26-1.71-3.19S7.29 6.75 7 5.3c-.29 1.45-1.14 2.84-2.29 3.76-1.14.93-1.71 2.03-1.71 3.19 0 2.22 1.8 4.05 4 4.05z%22%2F%3E%3Cpath d%3D%22M12.56 6.6A10.97 10.97 0 0 0 14 3.02c.5 2.5 2 4.9 4 6.5s3 3.5 3 5.5a6.98 6.98 0 0 1-11.91 4.97%22%2F%3E%3C%2Fsvg%3E\");\n  }\n  \/* Gas relay *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(3) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Cpath d%3D%22M22 12h-2.48a2 2 0 0 0-1.93 1.46l-2.35 8.36a.25.25 0 0 1-.48 0L9.24 2.18a.25.25 0 0 0-.48 0l-2.35 8.36A2 2 0 0 1 4.49 12H2%22%2F%3E%3C%2Fsvg%3E\");\n  }\n  \/* Pressure-relief valve *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(4) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Cpath d%3D%22m12 14 4-4M3.34 19a10 10 0 1 1 17.32 0%22%2F%3E%3C%2Fsvg%3E\");\n  }\n  \/* Conservator *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(5) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Crect x%3D%223%22 y%3D%227%22 width%3D%2218%22 height%3D%2210%22 rx%3D%225%22%2F%3E%3Cpath d%3D%22M7 17v3m10-3v3M12 4v3%22%2F%3E%3C%2Fsvg%3E\");\n  }\n  \/* Cooling-fan assembly *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(6) th {\n    --monitor-device-icon: url(\"data:image\/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 24 24%22 fill%3D%22none%22 stroke%3D%22black%22 stroke-width%3D%221.5%22 stroke-linecap%3D%22round%22 stroke-linejoin%3D%22round%22%3E%3Ccircle cx%3D%2212%22 cy%3D%2212%22 r%3D%222%22%2F%3E%3Cpath d%3D%22M12 10C9 8 8 5 10 4c3-2 6 1 4 5l-1 1m1 2c2-3 5-4 6-2 2 3-1 6-5 4l-1-1m-2 1c3 2 4 5 2 6-3 2-6-1-4-5l1-1m-1-2c-2 3-5 4-6 2-2-3 1-6 5-4l1 1%22%2F%3E%3C%2Fsvg%3E\");\n  }\n}\n@media screen and (min-width: 701px) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection > .rail > .balanced-heading {\n    max-inline-size: calc((100% - var(--monitor-intro-gap)) * 5 \/ 9);\n    min-block-size: 49.5px;\n    margin-block-end: 28px;\n  }\n  \/* Keep the original semantic table caption and visually align it to the second column. *\/\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices caption {\n    position: absolute;\n    inset-block-start: 0;\n    inset-inline-start: calc((100% - var(--monitor-intro-gap)) * 5 \/ 9 + var(--monitor-intro-gap));\n    inline-size: calc((100% - var(--monitor-intro-gap)) * 4 \/ 9);\n    padding: 0;\n  }\n}\n@media (max-width: 1200px) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection { --monitor-intro-gap: 32px; }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection > .rail > .balanced-heading { font-size: 36px; }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody { grid-template-columns: repeat(2, minmax(0, 1fr)); }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody tr:nth-child(n + 5) { grid-column: auto; }\n}\n@media (min-width: 701px) and (max-width: 1200px) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy {\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 24px 18px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy > :last-child {\n    grid-column: 1 \/ -1;\n  }\n}\n@media (max-width: 700px) {\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection {\n    --monitor-icon-size: 28px;\n    padding-block: 40px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection > .rail > .balanced-heading { font-size: 33px; }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody {\n    grid-template-columns: minmax(0, 1fr);\n    gap: 16px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody th {\n    min-height: 68px;\n    padding: 18px 20px;\n  }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .monitor-devices tbody td { padding: 18px 20px 20px; }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy { grid-template-columns: minmax(0, 1fr); }\n  body.page-id-763 #post-763 #subia-oil-template #monitoring-and-protection .balanced-copy p { font-size: 14px; }\n}\n}\n<\/style>\n<style id=\"product-sec2-split-763\">\n\/* Product SEC2 split surface, scoped to one verified page and section. *\/\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid {\n  display: grid;\n  grid-template-columns: repeat(2, minmax(0, 1fr));\n  gap: 24px;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) {\n  --split-inset: 26px;\n  display: flex;\n  flex-direction: column;\n  min-width: 0;\n  grid-row: auto;\n  grid-template: none;\n  gap: 0;\n  padding: var(--split-inset) var(--split-inset) 0;\n  border: 1px solid #d6e2e5;\n  border-radius: 0;\n  background: #fff;\n  box-shadow: none;\n  transition: border-color .18s ease, box-shadow .18s ease;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n):is(:hover, :focus-within) {\n  border-color: #8eb7bc;\n  background: #fff;\n  box-shadow: 0 8px 24px rgba(16, 47, 58, .07);\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > .product-photo {\n  flex: 0 0 auto;\n  align-self: stretch;\n  width: 100%;\n  margin: 0 0 16px;\n  border: 0;\n  border-radius: 0;\n  background: #fff;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) {\n  display: flex;\n  flex: 1;\n  flex-direction: column;\n  min-width: 0;\n  max-width: none;\n  margin: 0 calc(-1 * var(--split-inset));\n  padding: 24px var(--split-inset) 16px;\n  border-block-start: 1px solid #d6e2e5;\n  background: #f3f7f8;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) > :is(.sc-card-heading, .sc-card-meta, .sc-card-description, .sc-card-action) {\n  display: block;\n  min-width: 0;\n  max-width: none;\n  margin: 0;\n  padding: 0;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) h3 {\n  max-inline-size: 22ch;\n  min-block-size: 2.7em;\n  margin: 0 0 12px;\n  padding: 0;\n  color: #102f3a;\n  font-size: 24px;\n  font-weight: 600;\n  line-height: 1.35;\n  overflow-wrap: anywhere;\n  text-wrap: pretty;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) .series-range {\n  margin: 0 0 20px;\n  padding: 0;\n  color: #14757a;\n  font-size: 13px;\n  font-weight: 500;\n  line-height: 1.6;\n  overflow-wrap: anywhere;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) :is(.sc-card-description > p, p:not([class])) {\n  margin: 0 0 20px;\n  padding: 0;\n  color: #344951;\n  font-size: 14px;\n  line-height: 1.7;\n  overflow-wrap: anywhere;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > :is(.split-card-copy, .rd-series-copy, .series-copy) > .sc-card-action {\n  margin-block-start: auto;\n}\n\nbody.page-id-763 #post-763 #subia-oil-template #series > .rail > .series-grid > .series-product:nth-child(n) > 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Transformer manufacturing workshop SeriesElectrical rangeTap changingConstruction &amp; coolingProtectionTechnical reviewApplicationsBuyer FAQs Main transformerseries SZ and SZF oil-immersed main transformers provide on-load voltage regulation for substations. Select the cooling arrangement for the project load duty. SZ SZ On-load Tap-changing Transformers 6,300\u201350,000 kVA \u00b7 SZ11 \/ SZ13 \/ SZ20 Main [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1132,"parent":762,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-763","page","type-page","status-publish","has-post-thumbnail","hentry"],"blocksy_meta":{"vertical_spacing_source":"custom","content_area_spacing":"none","styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7},"has_hero_section":"disabled","disable_featured_image":"yes"},"_links":{"self":[{"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/pages\/763","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/comments?post=763"}],"version-history":[{"count":44,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/pages\/763\/revisions"}],"predecessor-version":[{"id":2250,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/pages\/763\/revisions\/2250"}],"up":[{"embeddable":true,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/pages\/762"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/media\/1132"}],"wp:attachment":[{"href":"https:\/\/subiapower.com\/es\/wp-json\/wp\/v2\/media?parent=763"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}