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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.xlsx file in ePHASORSIM example phasor07.
