Blog

A practical guide to transformer turns ratio testing on low voltage units - the applied-voltage method with a variac, tolerance limits, tap checks, and when to call for a ratio tester.

Hướng dẫn thực hành về cách đo điện trở một chiều (DC) của các cuộn dây biến áp và cuộn dây động cơ, bao gồm cách bố trí mạch bốn dây, lựa chọn dòng điện thử nghiệm, hiệu chỉnh nhiệt độ và các giới hạn đạt/không đạt.

A control transformer steps a 380 V or 480 V supply down to the 120 V or 24 V that relays, contactor coils and PLC inputs run on. Learn how it works, why inrush VA — not sealed VA — sets the rating, and how to size, tap, fuse and ground one.

A practical guide to transformer live and neutral wiring: how to identify L and N terminals, connect them correctly, and avoid the hidden shock hazards of a reversed input.

Learn how to convert single phase to three phase power with VFDs, rotary and static phase converters, plus sizing rules and where transformers fit.

Compare single-phase and three-phase transformers on windings, capacity, voltage stability, efficiency, and cost — then pick the right one for your load and supply.

A three-phase transformer can supply single-phase loads — but only with the right winding tap and the right derating. Here's the wiring, the math and the limits.

What is transformer no-load loss? A clear breakdown of hysteresis and eddy current loss, the calculation formulas, the open-circuit test method, and how a lower-loss core pays back over the service life.

Learn how to calculate transformer capacity in kVA for single-phase and three-phase systems, understand the kW-kVA power relationship, and size transformers with confidence.