GE 750 User Manual

GE Power Management 750/760 Feeder Management Relay 17-
69
17 COMMISSIONING 17.9 CONTROL SCHEMES
17
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 No. 06 (Selected To Trip.)
3. At the Bus Tie relay assert Logic Input No. 02 (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 No. 06 (Selected To Trip.)
5. At the Incomer 2 relay assert Logic Input No. 06 (Selected To Trip.)
6. At the Incomer 1 relay assert Logic Input No. 02 (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 Inst O/C 1 feature. Inject a current into the phase current input of the Incomer 1 relay.
Slowly increase this current until the Phase Inst O/C 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 Inst O/C 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 Inst O/C 1 feature and Disable the Phase Inst O/C 1 feature. Inject a current into the
phase current input of the Incomer 1 relay. Slowly increase this current until the Neutral Inst O/C 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 Inst O/C 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.
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 Inst O/C 1 feature. Inject a current into the phase current input of the Incomer 2 relay.
Slowly increase this current until the Phase Inst O/C 1 element operates. At the Incomer 2 relay the Trans-
fer Not Ready message should be displayed.
3. Slowly decrease the injected current until the Phase Inst O/C 1 element resets. At the Incomer 2 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 Inst O/C 1 feature and Disable the Phase Inst O/C 1 feature. Inject a current into the
phase current input of the Incomer 2 relay. Slowly increase this current until the Neutral Inst O/C 1 element
operates. At the Incomer 2 relay the Transfer Not Ready message should be displayed.
5. Slowly decrease the injected current until the Neutral Inst O/C 1 element resets. At the Incomer 2 relay
after the delay time of setpoint Transfer Delay This Source and the Transfer Not Ready message should
be removed from the display.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English