Alstom MiCOM P846, Technical Manual

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Commissioning P846/EN CM/D
MiCOM P846
(CM) 10-15
CM
Terminals
Supply Rail
P846
+ve (positive) M7 & M8
–ve (positive) M9 & M10
Table 4: Field voltage terminals
5.2.6 Input opto-isolators
This test checks that all the opto-isolated inputs on the relay are functioning correctly.
−
The P846 with I/O option “A” (model no. begins: P846xxxA..) has 8 opto inputs
−
The P846 with I/O option “B” (model no. begins: P846xxxB..) has 24 opto inputs
The opto-isolated inputs should be energized one at a time, see external connection
diagrams (P846/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 external 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 test checks that all the output relays are functioning correctly.
−
The P846 with I/O option “A” (model no. begins: P846xxxA..) has 8 relay outputs
−
The P846 with I/O option “B” (model no. begins: P846xxxB..) has 32 relay outputs
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 (P846/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 all the relay outputs of the particular hardware model.
Return the relay to service by setting cell [0F0D: COMMISSION TESTS, Test Mode] to
‘Disabled’.