8-50 750/760 Feeder Management Relay GE Multilin
8.6 CONTROL SCHEMES 8 COMMISSIONING TESTS
8
e) TRANSFER INITIATED BY SOURCE TRIP NO. 1
1. Energize both test sources at nominal voltage, and wait until the Transfer Not Ready message is removed from the dis-
play of both Incomer relays.
2. At the Incomer 1 relay assert Logic Input 13 (Source Trip). The Incomer 1 relay should trip the Incomer 1 breaker and
operate Output Relay 6 to send a Close From Incomer 1 signal to the Bus Tie relay. Output Relay 6 at the Incomer 1
relay should reset when the Incomer 1 breaker trips, removing the signal to the Bus Tie relay. The Bus Tie breaker
should not close as the voltage on its Bus and Line inputs is too high.
3. Slowly reduce the test Source 1 voltage. The Bus Tie breaker should close when the voltage is below the Dead Bus
Max Volts setpoint of its Synchrocheck feature. Increase the voltage to nominal.
4. At the Incomer 1 relay de-assert Logic Input No. 13 (Source Trip).
5. Momentarily assert Logic Input 3 (Remote Open) at the Bus Tie relay. The Bus Tie breaker should open.
6. Momentarily assert Logic Input 2 (Remote Close) at the Incomer 1 relay. The Incomer 1 breaker should close.
7. Check the Event Recorders in the Incomer 1 and Bus Tie relays for the correct messages and sequences, then clear
the recorders.
f) TRANSFER INITIATED BY SOURCE TRIP NO. 2
1. Energize both test sources at nominal voltage, and wait until the Transfer Not Ready message is removed from the dis-
play of both Incomer relays.
2. At the Incomer 2 relay assert Logic Input 13 (Source Trip). The Incomer 2 relay should trip the Incomer 2 breaker and
operate Output Relay 6 to send a Close From Incomer 2 signal to the Bus Tie relay. Output Relay 6 at the Incomer 2
relay should reset when the Incomer 2 breaker trips, removing the signal to the Bus Tie relay. The Bus Tie breaker
should not close as the voltage on its Bus and Line inputs is too high.
3. Slowly reduce the test Source 2 voltage. The Bus Tie breaker should close when the voltage is below the Dead Line
Max Volts setpoint of its Synchrocheck feature. Increase the voltage to nominal.
4. At the Incomer 2 relay de-assert Logic Input No. 13 (Source Trip).
5. Momentarily assert Logic Input 3 (Remote Open) at the Bus Tie relay. The Bus Tie breaker should open.
6. Momentarily assert Logic Input 2 (Remote Close) at the Incomer 2 relay. The Incomer 2 breaker should close.
7. Check the Event Recorders in the Incomer 2 and Bus Tie relays for the correct messages and sequences, then clear
the recorders.
g) TRANSFER INITIATED BY UNDERVOLTAGE ON SOURCE 1
1. Energize both test sources at nominal voltage, and wait until the Transfer Not Ready message is removed from the dis-
play of both Incomer relays.
2. Turn test Source 1 off. The Undervoltage 3 feature of the Incomer 1 relay should operate Output Relay 4 immediately.
At Incomer 2, Output Relay 3 operates and the Transfer Not Ready message is displayed. When the Undervoltage 4
feature times out, the Incomer 1 relay should trip Breaker 1 and operate Output Relay 6 to send a Close From Incomer
1 signal to the Bus Tie relay. Output Relay 6 should reset when Breaker 1 trips, removing the signal to the Bus Tie
relay. Upon receiving the signal from the Incomer 1, the Bus Tie relay should close the Bus Tie Breaker.
3. Check the Event Recorders in the Incomer 1 and Bus Tie relays for the correct messages and sequences, then clear
the recorders.
h) MANUAL RESTORATION OF INCOMER 1
1. Turn test Source 1 on and adjust Source 1 to be out-of-synchronism with Source 2.
2. At the Bus Tie relay assert Logic Input 6 (Selected To Trip).
3. At the Incomer 1 relay assert Logic Input 2 (Remote Close). The Incomer 1 breaker should not close as it cannot pass
synchrocheck. Adjust Source 1 until in-synchronism with Source 2. At this time the Incomer 1 breaker should close and
the Bus Tie breaker should trip. Turn off both voltages.
4. At the Bus Tie relay de-assert Logic Input 6 (Selected To Trip). Check the Event Recorders in the Incomer 1 and Bus
Tie relays for the correct messages and sequences, then clear the recorders.
Courtesy of NationalSwitchgear.com
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