Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-47
CM
8.4.4.4 Signal send test for permissive schemes (PUR/POR only)
This test applies to both Permissive Underreach, and Permissive Overreach scheme
applications.
Firstly, reconnect the test set so that the timer is no longer stopped by the Trip contact, but is
now stopped by the Signal Send contact (the contact that would normally be connected to
the pilot/signaling channel).
Inject a Zone 1
fault, and record the signal send contact operating time. The measured
operating time should typically be less than 20 ms for 50 Hz, and less than 16.7 ms for 60 Hz
applications. Switch OFF the ac supply and reset the alarms.
8.4.4.5 Signal send test for blocking scheme only
Firstly, recon
nect the test set so that the timer is no longer stopped by the Trip contact, but is
now stopped by the Signal Send contact (the contact that would normally be connected to
the pilot/signaling channel).
Inject a Zone 4
fault, and record the signal send contact operating time. The measured
operating time should typically be less than 20 ms for 50 Hz, and less than 16.7 ms for 60 Hz
applications. Switch OFF the ac supply and reset the alarms.
8.4.5 Scheme timer settings
Only a visual
check that the correct time delay settings have been applied is needed. The
relevant settings in the AIDED SCHEMES column are:
[344A: tRev. Guard] if applicable/visible
[344B: Unblocking Delay] if applicable/visible
[3453: WI Trip Delay] if applicable/visible
Upon completion of the tests any Phase diff, DEF, overcurrent, earth fault, breaker fail
or supervision elements which were disabled for testing purposes must have their
original settings restored in the CONFIGURATION column. Ensure that the Static Test
Mode has been left Disabled. Ensure that any wires/leads temporarily fitted to
energize the channel receive opto input have been removed.
8.4.6 Delta directional comparison
If the delta d
irectional comparison aided scheme is being used, the operation should be
tested. If not, skip to section 8.4.10.
To avoid
spurious operation of any distance, overcurrent, DEF/earth fault or breaker fail
elements, these should be disabled for the duration of the delta element tests. This is done
in the relay’s CONFIGURATION column. Ensure that cells [090B: Distance], [090F]
differential, [090C: DEF], [0910: Overcurrent], [0913: Earth Fault] and [0920: CB Fail] are all
set to Disabled. Make a note of which elements need to be re-enabled after testing.
8.4.6.1 Connection and preliminaries
It is recomm
ended that a three phase digital/electronic injection test set is used for ease of
commissioning.
Connect the test equipment to the relay via the test block(s) taking care not to open-circuit
any CT secondary. If MMLG type test blocks are used, the live side of the test plug must be
provided with shorting links before it is inserted into the test block.
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