GE 750 Instruction Manual page 409

CHAPTER 7: COMMISSIONING
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
Transfer Initiated by Undervoltage on Source 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.
 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.
 Check the Event Recorders in the Incomer 1 and Bus Tie relays for the
correct messages and sequences, then clear the recorders.
Manual Restoration of Incomer 1
 Turn test Source 1 on and adjust Source 1 to be out-of-synchronism with
Source 2.
 At the Bus Tie relay assert Logic Input 6 (Selected To Trip).
 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.
 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.
Transfer Initiated by Undervoltage on Source 2
 Energize both test sources at nominal voltage, and wait until the
Transfer Not Ready message is removed from the display of both
Incomer relays.
 Turn test Source 2 off.
The Undervoltage 3 feature of Incomer 2 relay should operate
immediately and operate output relay 4; at the Incomer 1 relay, Output
Relay 3 will operate and the Transfer Not Ready message will be
displayed.
When the Undervoltage 4 feature times-out the Incomer 2 relay should
trip Incomer Breaker 2 and operate Output Relay 6 to send a Close From
Incomer 2 signal to the Bus Tie relay.
Output Relay 6 should reset when Breaker 2 trips, removing the signal
CONTROL SCHEMES
7 - 81