GE 750 Instruction Manual page 315

Control Schemes
GE Multilin
recorder should have recorded logic input Initiate Reclosure, Remote Open, the
Reclose, and Reclosure Reset. Check the interval of the autoreclose reset timer
in the event recorder.
12. Assert the Initiate Reclosure logic input then immediately after assert the
Remote Open logic input, initiating a reclose and tripping the breaker. Check
that the breaker trips and later recloses, and the displayed number of shots
remaining is reduced by one. Immediately assert the Initiate Reclosure and
Remote Open logic inputs again, to initiate another trip and reclose and the
displayed number of shots remaining is reduced by one again. Repeat this
procedure until the programmed number of shots have been performed. Initiate
Reclosure once more and the scheme should go to lockout; the Reclosure
Lockout and Reclosure Disabled LEDs should now be on, and the Reclosure
Enabled LED should be off. Any output relays programmed to operate for
Lockout should now be operated.
13. The event recorder should have recorded each logic input for Initiate Reclosure,
each Reclose, and Reclosure Lockout. Check the interval of dead time for each
shot in the event recorder.
14. Press the RESET key. Lockout should be canceled and the displayed number of
shots should return to the programmed value (the event recorder should record
this reset.) Check that the Reclosure Lockout and Reclosure Disabled LEDs are
off, and the Reclosure Enabled LED is now on. Any output relays operated above
should now be de-energized. Close the breaker.
15. Repeat Step 12. Assert a Close command, either locally or remotely, and
observe that lockout is reset at the end of the
setpoint, with indications as above.
16. Set a current level above the pickup threshold of any time overcurrent element
and turn the current off.
17. Repeat Step 12. Assert a Close command, either locally or remotely, and turn
the current on. Check that lockout is not reset at the end of the manual close
blocking time interval, and the breaker eventually trips. Turn the current off.
If Breaker Operation Failure, and/or Breaker Failure features are Operational, use
the following procedure:
1. Open test switch SW9 to prevent a trip command from the relay from operating
the breaker.
2. Enable one of the overcurrent elements by setting its function to "Trip + AR".
3. Inject a current above the pickup level of both the operational overcurrent
feature and the Breaker Failure Current into the relay, until the feature sends a
trip, which will also initiate reclosure. After the failure delay time, a breaker
failure condition will be determined, which should immediately set the reclose
scheme to the Lockout state, turning the Reclosure Lockout LED on.
4. Turn the injected current off and Reset the relay. Disable the overcurrent
element and close both the breaker and SW9.
Use the following procedure to test Autoreclose Current Supervision. Note that the
number of reclosure shots setting controls the messages in this group. If four (4)
shots are programmed, all messages are available. If three (3) shots are
programmed, the
3 SHOTS FOR CURRENT ABOVE
If two (2) shots are programmed, the
setpoints are not available. This procedure assumes four (4) shots
CURRENT ABOVE
are programmed.
1. Close the breaker and wait until reclosure is enabled.
2. Verify that the
A1 STATUS
3. Open SW9 so the breaker cannot trip. Inject current and slowly ramp higher
until an instantaneous feature sends a trip, which also initiates reclosure. The
value displayed should be 4 (it has not yet decremented).
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Feeder Management Relay
AR BLOCK TIME UPON MANUAL CLOSE
setpoint is not available on the relay.
3 SHOTS FOR CURRENT ABOVE
value is "0".
AR AR SHOTS REMAINING
750/760
and
2 SHOTS FOR
7–61