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Трансформаторы
SUBIA manufactures and supplies transformers for utility networks, industrial facilities, buildings and energy projects. Explore eight product series, compare the electrical and installation requirements, and send your drawings for a configuration review.
Explore Eight Transformer Series
Compare construction, electrical ratings and installation requirements across the eight transformer series.
Масляные трансформаторы
Oil-immersed distribution and 35 kV power transformer construction.
Сухие трансформаторы
SCB cast-resin and SCBH amorphous-core dry-type transformers.
Силовые трансформаторы
SZ and SZF oil-immersed transformers with on-load tap changing.
Трансформаторы киоскового типа
ZGS pad-mounted transformer equipment with enclosed compartments.
Погружные распределительные трансформаторы S-MD
Герметичный масляный бак с антикоррозионным покрытием C5-M. При правильном монтаже втычные кабельные соединители высшего напряжения уплотняют стык с совместимыми вводами, препятствуя попаданию воды.
Разделительные трансформаторы
Open dry-type assemblies and SCB epoxy resin cast constructions for electrical isolation.
Single-phase Pole-mounted Transformers
D-series single-phase oil-immersed transformers for pole-mounted installations.
Специальные трансформаторы
Трансформаторы для особых электрических требований или условий установки, включая серию S с пылезащитным кожухом.
Transformer Types and Uses
Transformer categories can overlap
Construction
Oil-immersed
Installation
Pad-mounted
Construction
Dry-type
Electrical function
Isolation
Масляные трансформаторы
- Use
- Oil-insulated distribution
- Check
- Losses
- Cooling
- Oil containment
- Tap operation
Сухие трансформаторы
- Use
- Indoor dry-type distribution
- Check
- Electrical data
- Ventilation
- Enclosure
- Thermal conditions
Силовые трансформаторы
- Use
- In-service voltage regulation
- Check
- OLTC duty
- Tap range
- Cooling stage
- Control interfaces
Трансформаторы киоскового типа
- Use
- Outdoor supply with enclosed cable connections
- Check
- Switching
- Protection
- Terminals
- Foundation interfaces
Погружные распределительные трансформаторы S-MD
- Use
- Для распределения электроэнергии в подземных камерах. Герметичный масляный бак с антикоррозионным покрытием C5-M. При правильном монтаже втычные кабельные соединители высшего напряжения уплотняют стык с совместимыми вводами, препятствуя попаданию воды.
- Check
- Water exposure
- Operating state
- Drainage & access
- Heat removal
Разделительные трансформаторы
- Use
- Separate primary and secondary circuits
- Check
- Voltage ratio
- Secondary system
- Screening, if required
Single-phase Pole-mounted Transformers
- Use
- Single-phase pole-mounted supply
- Check
- System connection
- Terminals
- Pole interfaces
- Bank arrangement, if used
Специальные трансформаторы
- Use
- Особые требования проекта к электрическим параметрам, месту установки или кожуху
- Check
- Номинальные электрические параметры
- Кожух и охлаждение
- Доступ для обслуживания и очистки
- Oil-immersed
- Oil containment · Drainage
- Dry-type
- Cooling-air path · Enclosure conditions
Transformer Selection Guide
Operating duty
- Define the loads that run together and their operating schedule.
- Review the network connection and installation conditions.
- Compare the proposed rating and construction against the same duty.
Load and kVA
kVA is apparent power. Use electrical input power and true power factor from the same operating condition to convert kW to kVA.
Loads that operate together
- List normal demand, peak operation, maintenance transfers and planned expansion separately.
- Connected nameplate totals are useful background; they do not show when the loads run.
Measurement point
- For a UPS, charger or drive, use the equipment’s upstream input requirements.
- Avoid counting that input demand and its downstream output load as separate loads.
- For storage projects, distinguish charging and discharging power from battery energy capacity.
Conditions requiring additional review
- Motor starting, harmonics and phase imbalance.
- Changing ambient conditions and loss of forced cooling.
- Record the operating case behind a capacity allowance; no single spare-capacity percentage covers every duty.
Convert kW and power factor to kVA
Apparent power (kVA)
kVA = kW ÷ power factor
Enter a non-negative kW value and a power factor greater than 0 and no more than 1.
Use input power and true power factor from the same operating condition. Review operating duty before choosing a transformer rating.
Voltage and tap changing
State the incoming voltage, required secondary voltage, frequency and expected supply variation.
- OLTC On-load tap changer
- Adjusts the ratio while the transformer remains in service.
- DETC De-energized tap changer
- Requires the transformer to be de-energized before operation. An energized transformer carrying no load is still energized.
Specify the regulation requirement, tap range, step size, sensing point and control responsibilities. If an outage is acceptable, state when a fixed tap can be reviewed.
Impedance and vector group
Impedance and fault duty
- Review fault current and loaded voltage with the upstream supply, downstream cables and protection.
- Compare proposed impedance at the same stated rating, tap and reference conditions.
- Select impedance from the system fault-current and voltage-drop requirements.
Vector group, neutral and existing equipment
- Confirm winding connections, phase displacement, neutral and earthing arrangements.
- Review protection requirements and actual terminal phasing.
- For replacement or parallel operation, check ratio, taps, impedance and vector group against retained equipment drawings.
Cooling and operating cost
| Code | Construction | Air cooling |
|---|---|---|
| ONAN | Oil-immersed | Natural |
| ONAF | Oil-immersed | Forced |
| AN | Dry-type | Natural |
| AF | Dry-type | Forced |
Read each cooling stage with its rated capacity. Confirm auxiliary power, controls and documented capacity when required fans are unavailable.
Losses and total operating cost
- No-load losses
- Present throughout energized operation.
- Load losses
- Vary with current.
Request losses on the same test and temperature basis. Compare the same operating profile, energy cost and evaluation period.
Keep the required efficiency or loss specification attached to the proposed rating and construction.
Transformer Applications
Utility and secondary distribution
Start with retained connections, voltage regulation, feeder changes and permitted outages. Review power or oil-immersed transformers against the network duty.
Explore application Read a transformer nameplateIndustrial facilities
Establish coincident production demand, motor starting, drive inputs and expansion stages. Compare dry-type and oil-immersed installations with the room or outdoor site requirements.
Explore application Select an industrial distribution transformerИнфраструктура и общественные объекты
For charging hubs and data centers, distinguish charger or UPS input, cooling demand and maintenance transfers. Compare the required load cases and installation before selecting a transformer.
Explore application Review data-center transformer sizingRenewable and distributed energy
Define inverter or PCS AC data, import and export duties, reactive power and the collector connection. Identify whether the quotation covers a transformer or an integrated step-up station.
Explore application Review BESS transformer sizingTransformer Quotation Checklist
Supply scope
- Comparison basis
- Same equipment scope, electrical duty and acceptance conditions.
- Supply limits
- Mark terminals and boundaries on the single-line diagram; assign responsibility for external connections.
Installation & drawings
- Site layout
- Cable entry, terminal access, ventilation, maintenance clearances and delivery opening.
- Underground duty
- Pit details, water exposure and required operating state.
Testing & acceptance
- Acceptance plan
- Applicable standard, document schedule, acceptance criteria and witness points.
- Test evidence
- Design/type tests matched to the proposed model and configuration; unit-traceable routine results with test conditions.
Shipping & handover
- Dispatch documents
- Approved document revisions, operating instructions and packing list.
- Packing & handling
- Separately packed accessories and lifting information.
Why Choose SUBIA for Transformers
Engineering for your project
SUBIA develops transformer configurations from your ratings and drawings, reviewing the electrical requirements and installation interfaces together.
Transformer manufacturing
Transformer design, production and sales are coordinated in Yueqing, Wenzhou to support the technical requirements of your order.
Traceable test records
Routine test records identify the supplied transformer, while applicable type-test documents are matched to the model, rated voltage and required standard for review.
Packing and delivery coordination
Packing lists, package markings and accessory details are coordinated with the agreed delivery scope, helping your team plan equipment receipt, lifting and unloading.
Transformer Selection & Procurement FAQs
Can I request a quotation before selecting a series?
Yes. Send the required voltage pair, estimated load, installation location and a single-line diagram if available. Identify which information is confirmed and which still needs review. SUBIA can use that brief to discuss the construction and configuration with your team.
What should I send for a replacement transformer?
Include the existing nameplate, connection and outline drawings, cable or busbar interfaces, load information and the planned outage. Identify dimensions and connections that must remain unchanged. Include the details of any transformer that will operate in parallel with the replacement.
Is one larger transformer the best way to allow for expansion?
Compare the planned load stages and the installation before deciding. A larger unit, a later additional unit and a revised supply arrangement create different loading, space and connection requirements. Include the expected expansion date, operating plan and permitted shutdowns in the review.
Which test documents should accompany the quotation?
Specify the required standard and evidence in the enquiry. Ask which documents apply to the proposed design, which results will identify the supplied unit, and which inspections require your participation. Agree the document list and acceptance requirements before the order progresses.
