9-24 D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
FAULT LOCATOR CHAPTER 9: THEORY OF OPERATION
9
If the FAULT REPORT 1 VT SUBSTITUTION setting value is “V0” and the VTs are connected in a wye configuration, the fault
location is performed based on the actual phase to ground voltages. If the VTs are connected in a delta configuration, fault
location is performed based on the delta voltages and externally supplied neutral voltage:
Eq. 9-20
If the FAULT REPORT 1 VT SUBSTITUTION setting value is “I0” and the VTs are connected in a wye configuration, the fault
location is performed based on the actual phase to ground voltages. If the VTs are connected in a delta configuration, fault
location is performed based on the delta voltages and zero-sequence voltage approximated based on the zero-sequence
current:
Eq. 9-21
where Z
SYS0
is the equivalent zero-sequence impedance behind the relay as entered under the fault report setting menu.
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