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Multiphase Fault

The multiphase fault can represent phase-to-ground fault (single-phase, double-phase, three-phase) and phase-to-phase fault (double-phase, three-phase). The fault is modelled with two impedances connected to a virtual fault node.

Impedances from phases a, b, and c are connected (as selected) to the fault point via an impedance Zf = Rf + j Xf. The fault node is connected (if required) to ground via an impedance Zg = Rg + j Xg. In the Multiphase Fault Excel tab, there are columns for a declaration of the location that the fault is applied to.

The corresponding impedance value from the declared location to the fault point and the impedance value from the fault point to the ground are needed to be specified.

The user can leave the unused buses empty. Filling of the fault buses (i.e. column 1-3) should be done from left to right. For example, if Bus2 is filled, Bus1 may not be left empty.

In summary:

To present a ...Complete these columns to declare fault location...

single-phase-to-ground-fault

1st column (Bus1)

double-phase-to-ground-fault

1st and 2nd columns (Bus1 and Bus2)

three-phase-to-ground-fault

1st, 2nd and 3rd columns (Bus1, Bus2 and Bus3)

phase-to-phase-fault

1st and 2nd columns (Bus1 and Bus2)

three-phase-fault

1st, 2nd and 3rd columns (Bus1, Bus2 and Bus3)

Fault Parameters

Bus1 Bus2 Bus3 Symbol Description Unit Fault on bus: bus1 a unique name Fault on bus: bus2 Fault on bus: bus3 Fault ID Fault type ‘phase2ground’ or ‘phase2phase’ Resistance from phase to fault point ohms Reactance from phase to fault point Resistance from fault point to ground Reactance from fault point to ground Status 1 for active and 0 for inactive

Available I/O pins

 No Pin Description Pin Type Value/Unit Instruction 1 Set/Get status I/O 1: Active0: Inactive faultID/status 2 Get magnitude of fault current in wire j O A (RMS) faultID/Imagjwhere j is 1, 2 or 3 3 Get angle of fault current in wire j O Degree faultID/Iangjwhere j is 1, 2 or 3

Example

See the Fault page in phasor07_IEEE4.xls file in demo PHASOR-07

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