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Andy Huang
Andy Huang is a senior engineer and co-partner of SUBIA Power and Subian Electric. He writes about transformers, compact substations, and medium- and low-voltage switchgear, focusing on the technical decisions involved in specifying and purchasing power distribution equipment. His articles explain how voltage, capacity, impedance, vector group, cooling, and site conditions affect equipment selection. He also covers protection interfaces, factory acceptance testing, routine test reports, and the information buyers should confirm before placing an order. His technical guides address industrial facilities, renewable energy projects, battery energy storage, EV charging, and data centers, helping engineers, contractors, and procurement teams compare proposals, clarify project requirements, and ask manufacturers more informed questions.
What Is a Prefabricated Substation? Components and Power Flow
An illustrated introduction to prefabricated substation equipment, power flow and site interfaces.
Oil-Immersed vs Dry-Type Transformers: Selection by Installation Conditions
How installation conditions change the choice between oil-immersed and dry-type transformers.
Single-Phase vs Three-Phase Transformers: Supply, Connections and Applications
How supply and load phase, voltage notation and the physical arrangement shape transformer selection.
What Is a Pad-Mounted Transformer? Parts, Layout and Typical Uses
A guide to the ground-level cabinet, underground cable approach, compartment layout and typical uses.
How to Read a Transformer Nameplate: kVA, Voltage, Impedance and Connections
A walkthrough of a teaching nameplate with a copy-and-verify checklist for transformer replacement and RFQs.
Why Are Transformers Rated in kVA? kW, kVA and Power Factor Explained
An explanation of transformer kVA ratings and how kW and power factor relate to the current a transformer carries.
What Is a Distribution Transformer? Its Role in the Power System
A practical introduction to distribution transformers, their role near electrical loads, and how to identify that role on a single-line diagram.
Types of Electrical Transformers: Function, Insulation, Phase and Installation
A four-axis guide to transformer types, with a worked classification and the next questions to ask about ratings and installation.
What Is an Electrical Transformer and How Does It Work?
A practical introduction to electrical transformers, from the core and windings to step-up and step-down voltage, current and real-world losses.
How to Size a Transformer for Factory Expansion
A worked factory-expansion example shows how operating schedules, power factor and defined future loads change transformer demand—and what to verify before choosing capacity.