P54x/EN CM/La4 Commissioning
(CM) 10-22
MiCOM P543, P544, P545 & P546
CM
5.2.6 Input opto-isolators
This test checks that all the opto-isolated inputs on the relay are functioning correctly.
P543 and P544 have 16 opto inputs
P545 and P546 have 24 opto inputs
The opto-isolated inputs should be energized one at a time, see external connection
diagrams (P54x/EN IN) for terminal numbers. Ensuring correct polarity, connect the field
supply voltage to the appropriate terminals for the input being tested.
Note: The opto-isolated inputs may be energized from an eternal dc auxiliary
supply (e.g. the station battery) in some installations. Check that this is
not the case before connecting the field voltage otherwise damage to
the relay may result.
The status of each opto-isolated input can be viewed using either cell [0020: SYSTEM
DATA, Opto I/P Status] or [0F01: COMMISSION TESTS, Opto I/P Status], a ‘1’ indicating an
energized input and a ‘0’ indicating a de-energized input. When each opto-isolated input is
energized one of the characters on the bottom line of the display will change to indicate the
new state of the inputs.
5.2.7 Output relays
This te
st checks that all the output relays are functioning correctly.
P543 and P544 have either 14 standard relay outputs or a combination of 7 standard
outputs and 4 high break outputs according to model listing option selected
P545 has either 32 standard relay outputs or a combination of 16 standard outputs and 8
high break outputs according to model listing option selected
P546 has either 32 standard relay outputs, or a combination of 16 standard outputs and
8 high break outputs, or a combination of 8 standard outputs and 12 high break outputs
according to model listing option selected
Note: The high break output contacts fitted to I/O options “C” and “D” are
polarity sensitive. External wiring should, wherever possible, be
verified against polarity requirements described in the external
connection diagram (10P4430x) to ensure correct high break
operation when in service.
Ensure that the relay is still in test mode by viewing cell [0F0D: COMMISSION TESTS, Test
Mode] to ensure that it is set to ‘Blocked’.
The output relays should be energized one at a time. To select output relay 1 for testing, set
cell [0F0E: COMMISSION TESTS, Test Pattern] as appropriate.
Connect a continuity tester across the terminals corresponding to output relay 1 as given in
external connection diagram (P54x/EN IN).
To operate the output relay set cell [0F0F: COMMISSION TESTS, Contact Test] to ‘Apply
Test’. Operation will be confirmed by the continuity tester operating for a normally open
contact and ceasing to operate for a normally closed contact. Measure the resistance of the
contacts in the closed state.
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.
Repeat the test for the remaining relays.
Return the relay to service by setting cell [0F0D: COMMISSION TESTS, Test Mode] to
‘Disabled’.
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