electricpy.fault.phs2g

electricpy.fault.phs2g(Vth, Zseq, Rf=0, sequence=True, reference='A')

Double-Line-to-Ground Fault Calculator.

This function will evaluate the Zero, Positive, and Negative sequence currents for a double-line-to-ground fault.

\[I_1 = \frac{V_{th}}{Z_1+\frac{Z_2*(Z_0+3*R_f)}{Z_0+Z_2+3*R_f}}\]

\[I_2 = -\frac{V_{th}-Z_1*I_1}{X_2}\]

\[I_0 = -\frac{V_{th}-Z_1*I_1}{X_0+3*R_f}\]

Parameters:

• Vth (complex) – The Thevenin-Equivalent-Voltage

• Zseq (list of complex) – Tupple of sequence reactances as (Z0, Z1, Z2)

• Rf (complex, optional) – The fault resistance, default=0

• sequence (bool, optional) – Control argument to force return into symmetrical- or phase-domain values.

• reference ({'A', 'B', 'C'}) – Single character denoting the reference, default=’A’

Returns:

Ifault – The Array of Fault Currents as (If0, If1, If2)

Return type:

list of complex,