electricpy.fault.highzmini

electricpy.fault.highzmini(N, Ie, Irly=None, Vset=None, Rrly=2000, Imov=0, CTR=1)[source]

Minimum Current for High Impedance Protection Calculator.

Evaluates the minimum pickup current required to cause high-impedance bus protection element pickup.

Parameters:

  • N (int) – Number of Current Transformers included in scheme

  • Ie (float) – The excitation current at the voltage setting

  • Irly (float, optional) – The relay current at voltage setting

  • Vset (float, optional) – The relay’s voltage pickup setting in volts.

  • Rrly (float, optional) – The relay’s internal resistance in ohms, default=2000

  • Imov (float, optional) – The overvoltage protection current at the voltage setting. default=0.0

  • CTR (float, optional) – Current Transformer Ratio, default=1

Returns:

Imin – Minimum current required to cause high-impedance bus protection element pickup.

Return type:

float