P54x/EN CM/La4 Commissioning
(CM) 10-30
MiCOM P543, P544, P545 & P546
CM
6.1.3 Fiber connection
Where direct fiber connections are being used (or where multiplexer channels conforming to
the IEEE C37.94 standard are being used), using an appropriate optical fiber cable, connect
the channel transmitter to the channel receiver port on the rear of the relay.
6.1.4 Communications using P591 interface units (G.703)
6.1.4.1 P591 visual inspection
Carefully examine the unit to see that no
physical damage has occurred since installation.
The rating information given under the top access cover on the front of the unit should be
checked to ensure it is correct for the particular installation.
Ensure that the case earthing connection, top left-hand corner at the rear of the case, is
used to connect the unit to a local earth bar using an adequate conductor.
6.1.4.2 P591 Insulation
I
nsulation resistance tests are only necessary during commissioning if it is required for them
to be done and they haven’t been performed during installation.
Isolate all wiring from the earth and test the insulation with an electronic or brushless
insulation tester at a dc voltage not exceeding 500 V. The auxiliary dc supply terminals
should be temporarily connected together.
The insulation resistance should be greater than 100 M at 500 V.
On completion of the insulation resistance tests, ensure all external wiring is correctly
reconnected to the P591.
6.1.4.3 P591 external wiring
Che
ck that the external wiring is correct to the relevant connection diagram or scheme
diagram. The connection diagram number appears on the rating label under the top access
cover on the front of the P591. The corresponding connection diagram will have been
supplied with the ALSTOM Grid order acknowledgement for the P591.
It is especially important that the dc supplies are wired with the correct polarity.
6.1.4.4 P591 auxiliary supply
P591 unit
s operate from a dc only auxiliary supply within the operative range of 19 V to 65 V
for a 24 - 48 V version and 87.5 V to 300 V for a 110 - 250 V version.
Without energizing the P591 units measure the auxiliary supply to ensure it is within the
operating range.
It should be noted that the P591 interface unit is designed to withstand an ac ripple
component of up to 12% of the normal dc auxiliary supply. However, in all cases the peak
value of the dc supply must not exceed the maximum specified operating limit.
Do not energize the P591 using the battery charger with the battery disconnected as
this can irreparably damage the unit’s power supply circuitry.
6.1.4.5 P591 light emitting diode (LED)
On po
wer up the green ‘SUPPLY HEALTHY’ LED should have illuminated and stayed on,
therefore indicating that the P591 is healthy.
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