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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.
ONAN, ONAF, AN and AF: Understanding Transformer Cooling Ratings
Understand transformer cooling stages, their continuous ratings and what to verify before relying on fans.
Transformer Harmonics: When to Review Derating or a Special Design
Compare two harmonic current spectra and learn what to provide for a transformer derating, design or mitigation review.
How to Read a Transformer Routine Test Report Before Shipment
A buyer’s guide to checking transformer routine test reports, with an illustrative load-loss review and a pre-shipment closure checklist.
Transformer Sizing for Motor Starting: Why Running kVA Is Not Enough
A worked screening example explains motor-starting voltage dip and the data needed to check acceleration and transformer capacity.
Transformer Losses and Total Cost of Ownership: Comparing Two Quotations
See how no-load and load losses change the evaluated cost of two hypothetical transformer quotations under different load profiles.
Transformer Vector Groups Explained: Dyn11, Yyn0 and System Compatibility
An illustrated guide to winding notation, clock positions, neutral terminals and transformer system compatibility.
Transformer Impedance Explained: Fault Current, Voltage Drop and Selection
How to read transformer percent impedance and use it in fault-current and voltage-performance comparisons.
How to Select a Distribution Transformer for an Industrial Project
A selection workflow from plant duty and site constraints to electrical compatibility and comparable transformer quotations.
What Is a Ring Main Unit (RMU)? How It Works in Secondary Distribution
An illustrated guide to RMU circuit ways, a normally open ring and the alternate feed path after cable isolation.
What Is Electrical Switchgear? Functions, Components and Types
An illustrated introduction to switchgear assemblies, circuit duties and types.