Mini Circuit Breaker: Guide
A mini circuit breaker , more formally a miniature circuit breaker (MCB), protects low-voltage final circuits against overload and short circuit. It can be reset after the fault is corrected, but it must be selected for…
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Complete Guide to Power Distribution System Design
An electrical distribution system transfers power from a utility connection or generator through substations, transformers, switchgear, panels and cables to the final loads. Good design delivers acceptable voltage,…
Step Up Transformer: Guide
A step-up transformer raises alternating voltage from the primary side to the secondary side. For approximately the same apparent power, the higher-voltage side carries lower current. Step-up units connect generators…
Complete Guide to Electrical Calculations & Conversions
Converting kVA to amps is one of the most common calculations in transformer, generator, cable and switchgear selection. The arithmetic is simple, but the result is only correct when the phase arrangement and voltage…
Power Factor Correction Capacitor: Guide
A power factor correction capacitor supplies reactive power close to an inductive load, reducing the reactive current drawn from the utility. Correctly applied, a capacitor bank can lower current, release transformer…
What Is A Substation?
What is a substation? An electrical substation is a controlled point in a power system where electricity is transformed, switched, protected, measured, and routed. It connects generation and transmission networks to…
Complete Guide to Transformer Voltage, Connections & Vector Groups
A transformer changes alternating voltage through electromagnetic induction. If a transformer raises the voltage, it will reduce the current for approximately the same transferred apparent power, excluding losses.…
Complete Guide to Transformer Capacity, Size & Dimensions
Transformer capacity, physical size and dimensions are related but not interchangeable. A 150 kVA transformer states apparent-power capability; it does not uniquely determine height, width, weight or current until…
Complete Guide to Transformer Protection & Safety
A transformer grounding system controls earth-fault current, stabilizes system voltage to earth and bonds exposed conductive parts for safety. It works together with differential, overcurrent, earth-fault, temperature,…
Electrical Transformer: Guide
An electrical transformer transfers alternating-current energy between circuits through electromagnetic induction. It can raise or lower voltage, provide isolation, create a neutral and match equipment to a power…