P54x/EN CM/La4 Commissioning
(CM) 10-16
MiCOM P543, P544, P545 & P546
CM
5.1.1 Visual inspection
The rating information given under the top access cover on the front of the relay
should be checked. Check that the relay being tested is correct for the protected
line/circuit. Ensure that the circuit reference and system details are entered onto the
setting record sheet. Double-check the CT secondary current rating, and be sure to
record the actual CT tap which is in use.
Carefully examine the relay to see that no physical damage has occurred since installation.
Ensure that the case earthing connections, bottom left-hand corner at the rear of the relay
case, are used to connect the relay to a local earth bar using an adequate conductor.
5.1.2 Current transformer shorting contacts (optional check)
If require
d, the current transformer shorting contacts can be checked to ensure that they
close when the heavy duty terminal block (block reference C in Figure 3) is disconnected
from the cu
rrent input PCB.
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123
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7
89
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56
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14 15
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B
C
DE
FG
H
J
K
L
M
N
A
IRIG-B
TX
RX
P3003ENb
Figure 3 Rear terminal blocks on size 80TE case
The heavy duty terminal block is fastened to the rear panel using four crosshead screws.
These are located top and bottom between the first and second, and third and fourth,
columns of terminals (see Figure 4).
Not
e: The use of a magnetic bladed screwdriver is recommended to
minimize the risk of the screws being left in the terminal block or lost.
Pull the terminal block away from the rear of the case and check with a continuity tester that
all the shorting switches being used are closed. The table shows the terminals between
which shorting contacts are fitted.
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