Cold Load Pickup - GE 750 Instruction Manual

750/760
Feeder Management Relay

Cold Load Pickup

COLD LOAD
PICKUP
5–104
PATH: SETPOINTS S7 CONTROL
[ ] COLD LOAD PICKUP
FUNCTION: Disabled
COLD LOAD PICKUP
MESSAGE
RELAYS (3-7): -----
OUTAGE TIME BEFORE
MESSAGE
COLD LOAD:
COLD LOAD PICKUP
MESSAGE
BLOCK TIME:
PHASE INST OC 1
MESSAGE
BLOCKING: Disabled
NEUTRAL INST OC 1
MESSAGE
BLOCKING: Disabled
GND INST OC
MESSAGE
BLOCKING: Disabled
SENSTV GND INST OC
MESSAGE
BLOCKING: Disabled
NEG SEQ INST OC
MESSAGE
BLOCKING: Disabled
PHASE TIME OC 1
MESSAGE
RAISED PICKUP:
NEUTRAL TIME OC 1
MESSAGE
RAISED PICKUP:
GND TIME OC
MESSAGE
RAISED PICKUP:
SENSTV GND TIME OC
MESSAGE
RAISED PICKUP:
NEG SEQ TIME OC
MESSAGE
RAISED PICKUP:
SELECT SETPOINT
MESSAGE
GROUP: Active Group
The 750/760 can be programmed to block instantaneous overcurrent elements and
to raise the pickup level of time overcurrent elements when a cold load condition is
detected. Under normal operating conditions, the actual load on a feeder is less than
the maximum connected load, since not all consumers require maximum load at the
same time. When such a feeder is closed after a prolonged outage, the feeder inrush
and motor accelerating current may be above some protection settings. Without
historical data on a particular feeder, some utilities assume an initial cold load
current of about 500% of normal load, decaying to 300% after one second, 200%
after 2 seconds, and 150% after 3 seconds. See the following figure for details.
http://www.GEmultilin.com
COLD LOAD PICKUP
Range: Disabled,
Alarm, Control
Range: Any combination of 3 to 7
Auxiliary relays
Range: 1 to 1000 min. in steps of 1
100 min
Range: 1 to 1000 s in steps of 1
5 s
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: 0 to 100% in steps of 1
0%
Range: 0 to 100% in steps of 1
0%
Range: 0 to 100% in steps of 1
0%
Range: 0 to 100% in steps of 1
0%
Range: 0 to 100% in steps of 1
0%
Range: Group 1, Group 2, Group 3,
Group 4, Active Group
S7 Control
Alarm, Latched
GE Multilin