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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.

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

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