GE 750 Instruction Manual page 410

CONTROL SCHEMES
7 - 82
to the Bus Tie relay.
Upon receiving the signal from the Incomer 2 relay the Bus Tie relay
should close the Bus Tie Breaker.
 Check the Event Recorders in the Incomer 2 and Bus Tie relays for the
correct messages and sequences, then clear the recorders.
Manual Restoration of Incomer 2
 Turn test Source 2 on and adjust Source 2 to be out-of-synchronism with
Source 1.
 At the Bus Tie relay assert Logic Input 6 (Selected To Trip).
 At the Incomer 2 relay assert Logic Input 2 (Remote Close).
The Incomer 2 Breaker 2 should not close as it cannot pass
synchrocheck.
Adjust Source 2 until in-synchronism with Source 1.
At this time the Incomer 2 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 2 and Bus Tie relays for the
correct messages and sequences, then clear the recorders.
Simultaneous Loss of Both Sources
 Energize the line voltage input of both incomer relays from a single
source at nominal voltage, and wait until the Transfer Not Ready
message is removed from the display of both relays.
 Turn the test source off.
The Undervoltage 3 element of both incomer relays should operate
immediately and operate Output Relay 4; at both incomers the Transfer
Not Ready message will be displayed.
 If the
• When the Undervoltage 4 element times out, the incomer relays
should trip the incomer breakers.
The bus tie breaker should not close.
• Check the event recorders in both incomer relays for the correct
sequences, then clear the recorders.
 If the
• When the Undervoltage 4 element times out, the incomer relays
should not trip the incomer breakers.
The bus tie breaker should not close.
• Check the event recorders in both incomer relays for the correct
sequences, then clear the recorders.
After-Parallel Tripping of Selected Incomer
 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.
BLOCK TRIP ON DOUBLE LOSS
BLOCK TRIP ON DOUBLE LOSS
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: COMMISSIONING
setpoint is set to "Disabled":
setpoint is set to "Enabled":