electricpy.fault.iopirt

electricpy.fault.iopirt(IpriHV, IpriLV, TAPHV, TAPLV, corrHV='Y', corrLV='Y', CTRHV=1, CTRLV=1)[source]

Operate/Restraint Current Calculator.

Calculates the operating current (Iop) and the restraint current (Irt) as well as the slope.

Parameters:

  • IpriHV (list of complex) – Three-phase set (IA, IB, IC) of primary currents on the high-voltage side of power transformer.

  • complex (IpriLV list of) – Three-phase set (IA, IB, IC) of primary currents on the low-voltage side of power transformer.

  • float (CTRLV) – Relay’s TAP setting for high-voltage side of power transformer.

  • float – Relay’s TAP setting for low-voltage side of power transformer.

  • string (corrLV) – String defining correction factor on high-voltage side of power transformer, may be one of: (Y, D+, D-, Z); Y denotes Y (Y0) connection, D+ denotes Dab (D1) connection, D- denotes Dac (D11) connection, and Z (Z12) denotes zero-sequence removal. default=”Y”

  • optional – String defining correction factor on high-voltage side of power transformer, may be one of: (Y, D+, D-, Z); Y denotes Y (Y0) connection, D+ denotes Dab (D1) connection, D- denotes Dac (D11) connection, and Z (Z12) denotes zero-sequence removal. default=”Y”

  • string – String defining correction factor on low-voltage side of power transformer, may be one of: (Y, D+, D-, Z); Y denotes Y (Y0) connection, D+ denotes Dab (D1) connection, D- denotes Dac (D11) connection, and Z (Z12) denotes zero-sequence removal. default=”Y”

  • optional – String defining correction factor on low-voltage side of power transformer, may be one of: (Y, D+, D-, Z); Y denotes Y (Y0) connection, D+ denotes Dab (D1) connection, D- denotes Dac (D11) connection, and Z (Z12) denotes zero-sequence removal. default=”Y”

  • float – Current Transformer Ratio for high-voltage side of power transformer, default=1

  • float – Current Transformer Ratio for low-voltage side of power transformer, default=1

Returns:

  • Iop (list of float) – The operating currents for phases A, B, and C.

  • Irt (list of float) – The restraint currents for phases A, B, and C.

  • slope (list of float) – The calculated slopes for phases A, B, and C.