Alstom MiCOM P54 Series, Technical Manual

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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
communication 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-reclose 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’.