P341/EN O/B11 Operation Guide
CHAPTER 3 Commissioning and
Page 14/80 Maintenance
MiCOM P341
4.2.6 Output relays
This test checks that all the output relays are functioning correctly. The P341 and
P342 relays have 7 output relays while P343 relays have 14 output relays.
Ensure that the relay is still in test mode by viewing cell [0F0D: COMMISSION TESTS,
Test Mode].
The output relays should be energised one at a time. To select output relay 1 for
testing, set cell [0F0E: COMMISSION TESTS, Test Pattern] as shown in Table 6.
Connect a continuity tester across the terminals corresponding to output relay 1 given
in Table 6.
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 is not exceeded by the associated
output relay being operated for too long. It is therefore advised that the time
between application and removal of contact test is kept to the minimum.
Repeat the test for relays 2 to 7 for P341 relays.
Monitor Terminals
Output
N/C N/O
Cell [Test Pattern] Setting
Relay 1 – E1 – E2 00000000000001
Relay 2 – E3 – E4 00000000000010
Relay 3 – E5 – E6 00000000000100
Relay 4 E7 – E9 E8 – E9 00000000001000
Relay 5 E10 – E12 E11 – E12 00000000010000
Relay 6 E13 – E15 E14 – E15 00000000100000
Relay 7 E16 – E18 E17 – E18 00000001000000
Table 6: Relay output terminals and test pattern settings
Return the relay to service by setting cell [0F0D: COMMISSION TESTS, Test Mode] to
‘Disabled’.
4.2.7 Rear communications port
This test should only be performed where the relay is to be accessed from a remote
location and will vary depending on the communications standard being adopted.
It is not the intention of the test to verify the operation of the complete system from the
relay to the remote location, just the relay’s rear communications port and any
protocol converter necessary.
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