P54x/EN CM/La4 Commissioning
(CM) 10-56
MiCOM P543, P544, P545 & P546
CM
8.4.13 Restoration of communications and clearing VTS
If, during the testing described in section 8.4 above, it was necessary to create
comm
unication failure conditions and/or VTS alarm conditions, these should be cleared now.
If communications failure was achieved by setting cell [0F13: Test Loopback] to Disabled,
then this should be reset to Enabled.
Reset the protection communications statistics.
8.5 Check trip and auto-reclose cycle
If the auto-re
close function is being used, the circuit breaker trip and auto-reclose cycle can
be tested automatically at the application-specific settings.
In order to test the trip and close operation without operating the breaker, the following
criterion must be satisfied :-
The “CB Healthy” DDB should not be mapped, or if it is mapped, it must be asserted
high.
The CB status inputs (52 A, etc.) should not be mapped, or if they are mapped, they
should be activated so as to mimic the circuit breaker operation.
If configured for single pole tripping, either the VT Connected setting should be set to
No, or appropriate voltage signals need to be applied to prevent the pole dead logic from
converting to 3-pole tripping.
To test the first three-phase auto-reclose cycle, set cell [0F11: COMMISSION TESTS, Test
Auto-reclose] to ‘3 Pole Test’. The relay will perform a trip/reclose cycle. Repeat this
operation to test the subsequent three-phase auto-reclose cycles.
Check all output relays used for circuit breaker tripping and closing, blocking other devices,
etc. operate at the correct times during the trip/close cycle.
The auto-reclose cycles for single phase trip conditions can be checked one at a time by
sequentially setting cell [0F11: COMMISSION TESTS, Test Auto-reclose] to ‘Pole A Test’,
‘Pole B Test’ and ‘Pole C Test’.
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