electricpy.fault.synmach_Iasym¶

electricpy.fault.synmach_Iasym(t, Eq, Xdpp, Xqpp, Ta)[source]¶

Synch. Machine Asymmetrical Fault Current Calc.

Determines the asymmetrical fault current of a synchronous machine given the machine parameters, the internal voltage, and the time for which to calculate.

\[I_{asym}=\sqrt{2}\left|E_q\right|\frac{1}{2} \left(\frac{1}{X"_d}+\frac{1}{X"_q}\right)e^{\frac{-t} {T_a}}\]

Parameters:¶

t : float¶

Time at which to calculate the fault current

Eq : float¶

The internal machine voltage in per-unit-volts

Xdpp : float¶

The X”d (d-axis subtransient) reactance in per-unit-ohms

Xqpp : float¶

The X”q (q-axis subtransient) reactance in per-unit-ohms

Ta : float¶

Armature short-circuit (DC) time constant in seconds

Returns:¶

Iasym – Peak asymmetrical fault current in per-unit-amps

Return type:¶

float