GE 750 Instruction Manual page 406

CONTROL SCHEMES
7 - 78
 Check the Event Recorders in the Incomer 1 and 2 and Bus Tie relays
for the correct messages and sequences, then clear the recorders.
Low Voltage Logic
 Slowly reduce test voltage Source 1 supplying Incomer relay 1.
At the pickup voltage of the Line Undervoltage 3 feature Output Relay 4
should operate.
At this time the Incomer 2 relay should display the Transfer Not Ready
message.
 Slowly increase test voltage Source 1.
At the reset voltage of the Line Undervoltage 3 feature Output Relay 4
should reset.
At the Incomer 2 relay after the time delay of setpoint Transfer Delay
Other Source the message Transfer Not Ready should be removed from
the display.
 Slowly reduce test voltage Source 2 supplying Incomer relay 2.
At the pickup voltage of the Line Undervoltage 3 feature Output Relay 4
should operate.
At this time the Incomer 1 relay should display the Transfer Not Ready
message.
 Slowly increase test voltage Source 2.
At the reset voltage of the Line Undervoltage 3 feature Output Relay 4
should reset.
At the Incomer 1 relay after the time delay of setpoint Transfer Delay
Other Source the message Transfer Not Ready should be removed from
the display.
 Turn voltages off.
Incomer breakers 1 and 2 should trip when Undervoltage 4 times out.
 Check the Event Recorders in both Incomers and the Bus Tie relay for
the correct messages and sequences, then clear the recorders.
Transfer Initiated by Lockout 86-1
 Energize both test sources at nominal voltage, close Incomer breakers 1
and 2, and wait until the Transfer Not Ready message is removed from
the display of both Incomer relays.
 At the Incomer 1 relay assert Logic Input 12 (Transformer Lockout).
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.
 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.
CHAPTER 7: COMMISSIONING
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL