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Short Circuit Calculators

A4-1 Short Circuit

Short circuit studies are an important study branch when designing electrical systems.

Parameters

s = apparent power (va). This is the total, complex power required to deliver the real power.

v = volts. Either line or phase voltage depending if it is a polyphase system.

z = impedance. Impedance in per unit of the system apparent power.

i = amps. Line current.

s f = s z i f = s 3 · v

Short Circuit

Enter at VA, Voltage and impedance to work out the rest