GE 750 Instruction Manual page 312

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Feeder Management Relay
7–58
3. If the
BLOCK TRIP ON DOUBLE LOSS
3.1. When the Undervoltage 4 element times out, the incomer relays should
trip the incomer breakers. The bus tie breaker should not close.
3.2. Check the event recorders in both incomer relays for the correct
sequences, then clear the recorders.
4. If the
BLOCK TRIP ON DOUBLE LOSS
4.1. When the Undervoltage 4 element times out, the incomer relays should
not trip the incomer breakers. The bus tie breaker should not close.
4.2. Check the event recorders in both incomer relays for the correct
sequences, then clear the recorders.
l) After-Parallel Tripping of Selected Incomer
1. Energize both test sources at nominal voltage, still in-synchronism, and wait
until the Transfer Not Ready message is removed from the display of both
Incomer relays.
2. At the Incomer 1 relay assert Logic Input 6 (Selected To Trip.)
3. At the Bus Tie relay assert Logic Input 2 (Remote Close.) The Bus Tie breaker
should close as the voltages are in-synchronism. After this the Incomer 1
breaker should trip.
4. At the Incomer 1 relay de-assert Logic Input 6 (Selected To Trip.)
5. At the Incomer 2 relay assert Logic Input 6 (Selected To Trip.)
6. At the Incomer 1 relay assert Logic Input 2 (Remote Close.) The Incomer 1
breaker should close as the voltages are in-synchronism. After this the Incomer
2 breaker should trip. Turn the voltages off.
7. Check the Event Recorders in the Incomer 1 and 2 and Bus Tie relays for the
correct messages and sequences, then clear the recorders.
m) Transfer Blocked by Overcurrent on Incomer 1
1. Energize both test sources at nominal voltage, and wait until the Transfer Not
Ready message is removed from the display of both Incomer relays.
2. Disable the Neutral IOC 1 feature. Inject a current into the phase current input
of the Incomer 1 relay. Slowly increase this current until the Phase IOC 1
element operates. At the Incomer 1 relay and the Transfer Not Ready message
should be displayed.
3. Slowly decrease the injected current until the Phase IOC 1 element resets. At
the Incomer 1 relay after the delay time of setpoint Transfer Delay This Source
and the Transfer Not Ready message should be removed from the display.
4. Enable the Neutral IOC 1 feature and Disable the Phase IOC 1 feature. Inject a
current into the phase current input of the Incomer 1 relay. Slowly increase this
current until the Neutral IOC 1 element operates. At the Incomer 1 relay the
Transfer Not Ready message should be displayed.
5. Slowly decrease the injected current until the Neutral IOC 1 element resets. At
the Incomer 1 relay after the delay time of the
setpoint and the Transfer Not Ready message should disappear from the
display.
n) Transfer Blocked by Overcurrent on Incomer 2
1. Energize both test sources at nominal voltage, and wait until the Transfer Not
Ready message is removed from the display of both Incomer relays.
2. Disable the Neutral IOC 1 feature. Inject a current into the phase current input
of the Incomer 2 relay. Slowly increase this current until the Phase IOC 1
element operates. At the Incomer 2 relay the Transfer Not Ready message
should be displayed.
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setpoint is set to "Disabled":
setpoint is set to "Enabled":
TRANSFER DELAY THIS SOURCE
Control Schemes
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