electricpy.fault.synmach_Isym¶

electricpy.fault.synmach_Isym(t, Eq, Xd, Xdp, Xdpp, Tdp, Tdpp)[source]¶

Synch. Machine Symmetrical Fault Current Calc.

Determines the Symmetrical Fault Current of a synchronous machine given the machine parameters, the internal voltage, and the time for which to calculate.

$$I_a(t)=\sqrt{2}\left|E_q\right|[\frac{1}{X_d}+(\frac{1}{X_d^{\prime }}-\frac{1}{X_d})\cdot e^{\frac{-t}{T_d^{\prime }}}+(\frac{1}{X{"}_d}-\frac{1}{X_d^{\prime }})\cdot e^{\frac{-t}{T{"}_d}}]$$

Parameters:¶

t : float¶

Time at which to calculate the fault current

Eq : float¶

The internal machine voltage in per-unit-volts

Xd : float¶

The Xd (d-axis) reactance in per-unit-ohms

Xdp : float¶

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

Xdpp : float¶

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

Tdp : float¶

The T’d (d-axis transient) time constant of the machine in seconds

Tdpp : float¶

The T”d (d-axis subtransient) time constant of the machine in seconds

Returns:¶

Ia – Peak symmetrical fault current in per-unit-amps

Return type:¶

float