GE 750 Instruction Manual page 191

S6 Monitoring
VT FAILURE
GE Multilin
f) VT Failure
PATH: SETPOINTS S6 MONITORING
[ ] VT FAILURE
FUNCTION: Disabled
VT FAILURE
MESSAGE
RELAYS (3-7): -----
VT FAILURE
MESSAGE
DELAY: 10 s
The 750/760 detects a VT fuse failure when there are significant levels of negative
sequence voltage without correspondingly significant levels of negative sequence
current measured at the output CTs. Also, if there is not a significant amount of
positive sequence voltage when there is positive sequence current then it could
indicate that all the VT fuses have been pulled or the VTs have been racked out.
FIGURE 5–55: VT Failure Logic
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Feeder Management Relay
EQUIPMENT VT FAILURE
Range: Disabled,
Alarm, Control
Range: Any combination of 3 to 7
Auxiliary relays
Range: 0 to 60000 s in steps of 1
750/760
Alarm, Latched
5–95