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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 (see the figure).

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

Symbol	Description	Unit
Bus1	Fault on bus: bus1	a unique name
Bus2	Fault on bus: bus2
Bus3	Fault on bus: bus3
ID	Fault ID
Type	Fault type	‘phase2ground’ or ‘phase2phase’
R_f	Resistance from phase to fault point	ohms
X_f	Reactance from phase to fault point
R_g	Resistance from fault point to ground
X_g	Reactance from fault point to ground
Active	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: Active 0: Inactive	faultID/status
2	Get magnitude of fault current in wire j	O	A (RMS)	faultID/Imagj where j is 1, 2 or 3
3	Get angle of fault current in wire j	O	Degree	faultID/Iangj where j is 1, 2 or 3

Example

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