Alstom MiCOM P546 - 6.1.5.9 P54 x optical received signal level from P592; 6.1.6 Communications using P593 interface units (X.21); P593 visual inspection; 6.1.6.2 P593 insulation

Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-33
CM
6.1.5.9 P54x optical received signal level from P592
Return to the P54x relay. Disconnect the fiber from the P54x optical receiver that connects
to the optical transmitter of the P592 and measure the received signal level. The value
should be in the range -16.8 dBm to -25.4 dBm. Record the measurement and then
reconnect the fiber to the optical receiver.
6.1.6 Communications using P593 interface units (X.21)
Before loo
pback testing can begin, some other checks must be completed.
6.1.6.1 P593 visual inspection
WARNING
: Electrostatic Discharge (ESD) precautions must be applied while the
secondary cover is removed from the unit.
If applicable replace the secondary front cover from the unit. 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.
6.1.6.2 P593 insulation
I
nsulation resistance tests are only necessary during commissioning if it is required for them
to be done and they have not 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 X.21 circuits of the P593 are isolated from all other circuits but are electrically
connected to the outer case. The circuits must not therefore be insulation or impulse
tested to the case.
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 P593.
6.1.6.3 P593 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 P593. The corresponding connection diagram will have been
supplied with the ALSTOM Grid order acknowledgement for the P593.
It is especially important that the dc supplies are wired with the correct polarity.