GE 750 User Manual

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750/760 Feeder Management Relay GE Power Management
17.8 MONITORING 17 COMMISSIONING
17
17.8.7 APPARENT POWER DEMAND
Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION or Figure 17–2: RELAY
TEST WIRING – DELTA CONNECTION on page 17–4.
1. Clear demand data registers before starting this test.
2. Inject a fixed value of VA. Monitor the actual value of the measured demand, and note the level at which
the feature generates an output. Turn the current off.
Indications and Operations caused by the various Functions are as outlined under Phase Time O/C,
with the following exception:
There is no Trip function for this element.
17.8.8 ANALOG THRESHOLD 1 (2)
1. Inject DC mA current at a level below the pickup level into the analog input.
2. Slowly increase the current until the element generates an output. Slowly reduce the current until the ele-
ment reset.
Timing:
1. Connect the Stop Trigger.
2. Preset the DC mA current source to a minimum of 110% of the pickup current. Turn the current off, and
reset the timer.
3. Inject the preset current into the analog input and note the measured delay time. Reset the timer.
4. Repeat step 3 four more times and obtain an average of the time intervals.
5. Disconnect the Stop Trigger.
17.8.9 ANALOG IN RATE 1 (2)
1. Connect the output of a dc ramping-current generator to the analog input.
2. Remove the power supply from the relay to ensure the analog input memory is set to zero, then apply
power to the relay.
3. Set the ramp-rate below the rate-of-change pickup and inject into the analog input. Wait for 90 seconds
(fast rate) or 90 minutes (slow rate) to ensure the relay has properly measured the input ramping-rate. The
relay should not pickup. Cycle the relay power supply Off then On.
4. Adjust the ramp-rate to a higher rate and again apply and; if the relay doesn't pickup cycle the relay power
supply Off then On. Repeat this procedure until the element generates an output.
Indications and Operations caused by the various Functions are as outlined under Phase Time O/C,
with the following exception:
There is no Trip function for this element.
Timing:
1. Connect the Stop Trigger.
2. Preset the ramp-rate to a minimum of 110% of the pickup. Turn the current off, and reset the timer.
3. Inject the preset current into the analog input and note the measured delay time. Reset the timer.
4. Repeat step 3 four more times and obtain an average of the time intervals.
5. Disconnect the Stop Trigger.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English