P54x/EN CM/La4 Commissioning
(CM) 10-60
MiCOM P543, P544, P545 & P546
CM
10. END-TO-END SCHEME TESTS
If an external signalling channel is being employed to provide aided scheme signalling (i.e.
an aided protection scheme is being realised without InterMiCOM
64
protection signalling, it
should be tested. If only basic schemes are being used, or if InterMiCOM
64
is being used to
realise the schemes, skip to section 11.
10.1
Signaling channel check
This
section aims to check that the signaling channel is able to transmit the ON/OFF signals
used in aided schemes between the remote line ends. Before testing, check that the
channel is healthy (for example, if a power line carrier link is being used, it may not be
possible to perform the tests until the protected circuit is live and has in-service). If the
channel tests must be postponed, make a note to perform them as a part of the “ON-LOAD
CHECKS” in section 11 of these Commissioning Instructions.
10.1.1
Aided scheme 1
If Aided Scheme 1 is e
nabled, it must be tested. This is achieved by operating output
contacts as in section 8.4.4 to mimic the relay sending an aided channel signal.
Not
e:
For these tests, it will be necessary that an engineer is present at
both ends of the line - at the local end to send aided signals, and
at the remote end to observe that the signals have been received
as required. A telephone link between the two commissioning
engineers will be necessary, to allow conversation.
Put the relay in test mode by setting cell [0F0D: COMMISSION TESTS, Test Mode] to
‘Blocked’.
Record which contact is assigned as the Signal Send 1 output. Select this output contact as
the one to test. And advise the remote end engineer that the contact is about to be tested.
10.1.1.1 Remote end preparation to observe channel arrival
At the rem
ote end, the engineer must confirm the assignment of the Monitor Bits in the
COMMISSION TESTS column in the menu, in order to be able to see the aided channel on
arrival. Scroll down and ensure cells are set: [0F05: Monitor Bit 1] to 493, and [0F09:
Monitor Bit 5] to 507. In doing so, cell [0F03: Test Port Status] will appropriately set or reset
the bits that now represent Aided 1 Scheme Receive (DDB #493), and Aided 2 Scheme
Receive (DDB #507), with the rightmost bit representing Aided Channel 1. From now on the
remote end engineer should monitor the indication of [0F03: Test Port Status].
10.1.1.2 Application of the test
At the local
end, to operate the output relay set cell [0F0F: COMMISSION TESTS,
Contact Test] to ‘Apply Test’.
Reset the output relay by setting cell [0F0F: COMMISSION TESTS, Contact Test] to
‘Remove Test’.
Note: It should be ensured that thermal ratings of anything connected to the
output relays during the contact test procedure are not exceeded by
the associated output relay being operated for too long. It is therefore
advised that the time between application and removal of the contact
test is kept to the minimum.
Check with the engineer at the remote end that the Aided Channel 1 signal did change state
as expected. The Test Port Status should have responded as in the table below:
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