GE C60 Instruction Manual page 523

CHAPTER 8: THEORY OF OPERATION
where K is the zero sequence compensation factor (for the first six equations)
0
Z is the mutual zero sequence impedance
0M
I = I /3 and I is the ground current of the adjacent line. The I
0M G G
line.
For ABC faults, all three AB, BC, and CA loops are analyzed and the final result is selected based upon consistency of the
results.
The element calculates the distance to the fault (with m in miles or kilometers) and the phases involved in the fault.
The relay allows locating faults from delta-connected VTs. If the
and the VTs are connected in wye, the fault location is performed based on the actual phase to ground voltages. If the VTs
are connected in delta, fault location is suspended.
If the
FAULT REPORT 1 VT SUBSTITUTION
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:
If the
FAULT REPORT 1 VT SUBSTITUTION
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:
where Z is the equivalent zero-sequence impedance behind the relay as entered under the fault report setting menu.
SYS0
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
compensation term is applied for the entirely parallel
0M
FAULT REPORT 1 VT SUBSTITUTION
setting value is "V0" and the VTs are connected in a wye configuration, the fault
setting value is "I0" and the VTs are connected in a wye configuration, the fault
FAULT LOCATOR
setting is set to "None,"
Eq. 8-11
Eq. 8-12
8-3
8