GE 750 Instruction Manual page 468

17.9 CONTROL SCHEMES
5. Slowly raise V
RESTORE MIN VOLTS
6. Inject V = V
an
7. Reduce the injected voltages to cause an undervoltage trip, then set V
8. Slowly raise V
RESTORE MIN VOLTS
9. Inject V = V
an
10. Reduce the injected voltages to cause an undervoltage trip, then set V
11. Slowly raise V
RESTORE MIN VOLTS
b) FOR DELTA VTs
Test Connections per Figure 17–2: RELAY TEST WIRING – DELTA CONNECTION on page 17–4.
Procedure To Check Minimum Voltage with One Phase For Operation
1. Assert or De-assert a logic input to simulate an open breaker.
2. Set Undervolt Restore Delay to 0.
3. Inject V = V
ab
4. Reduce the injected voltages to cause an undervoltage trip, then set V
5. Slowly raise V
RESTORE MIN VOLTS
6. Repeat steps 3 through 5 except adjust V
Pickup with Two or Three Phases For Operation:
1. Assert or De-assert a logic input to simulate an open breaker.
2. Set Undervolt Restore Delay to 0.
3. Inject V = V
ab
17
4. Reduce the injected voltages to cause an undervoltage trip, then set V
5. Slowly raise V
RESTORE MIN VOLTS
6. Inject V = V
ab
7. Reduce the injected voltages to cause an undervoltage trip, then set V
8. Slowly raise V
RESTORE MIN VOLTS
17-
62
Courtesy of NationalSwitchgear.com
until the 2 CLOSE relay operates. This is the operating level of setpoint
an
for V .
an
= V = nominal voltage into the bus voltage input of the relay.
bn cn
until the 2 CLOSE relay operates. This is the operating level of setpoint
bn
for V .
bn
= V = nominal voltage into the bus voltage input of the relay.
bn cn
until the 2 CLOSE relay operates. This is the operating level of setpoint
cn
for V .
cn
= nominal voltage into the bus voltage input of the relay.
cb
until the 2 CLOSE relay operates. This is the operating level of setpoint
ab
for V .
ab
= nominal voltage into the bus voltage input of the relay.
cb
until the 2 CLOSE relay operates. This is the operating level of setpoint
ab
for V .
ab
= nominal voltage into the bus voltage input of the relay.
cb
until the 2 CLOSE relay operates. This is the operating level of setpoint
cb
for V .
cb
750/760 Feeder Management Relay
.
cb
17 COMMISSIONING
UNDERVOLT
and V to nominal.
an cn
UNDERVOLT
and V to nominal.
an bn
UNDERVOLT
to 0
cb
UNDERVOLT
to nominal
cb
UNDERVOLT
to nominal
ab
UNDERVOLT
GE Power Management