Areva MiCOM P341, Руководство по эксплуатации

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Operation Guide P341/EN O/B11
Commissioning and CHAPTER 3
Maintenance Page 11/80
MiCOM P341
Energise the relay only if the auxiliary supply is within the operating range. If an
MMLG test block is provided, it may be necessary to link across the front of the test
plug to connect the auxiliary supply to the relay.
4.2 With the relay energised
The following group of tests verify that the relay hardware and software is functioning
correctly and should be carried out with the auxiliary supply applied to the relay.
The current and voltage transformer connections must remain isolated from the relay
for these checks. The trip circuit should also remain isolated to prevent accidental
operation of the associated circuit breaker.
4.2.1 Watchdog contacts
Using a continuity tester, check the watchdog contacts are in the states given in Table
2 for an energised relay.
4.2.2 Date and time
Before setting the date and time, ensure that the factory-fitted battery isolation strip
that prevents battery drain during transportation and storage has been removed.
With the lower access cover open, presence of the battery isolation strip can be
checked by a red tab protruding from the positive side of the battery compartment.
Lightly pressing the battery to prevent it falling out of the battery compartment, pull
the red tab to remove the isolation strip.
The date and time should now be set to the correct values. The method of setting will
depend on whether accuracy is being maintained via the optional Inter-Range
Instrumentation Group standard B (IRIG-B) port on the rear of the relay.
4.2.2.1 With an IRIG-B signal
If a satellite time clock signal conforming to IRIG-B is provided and the relay has the
optional IRIG-B port fitted, the satellite clock equipment should be energised.
To allow the relay’s time and date to be maintained from an external IRIG-B source
cell [0804: DATE and TIME, IRIG-B Sync] must be set to ‘Enabled’.
Ensure the relay is receiving the IRIG-B signal by checking that cell [0805: DATE and
TIME, IRIG-B Status] reads ‘Active’.
Once the IRIG-B signal is active, adjust the time offset of the universal co-ordinated
time (satellite clock time) on the satellite clock equipment so that local time is
displayed.
Check the time, date and month are correct in cell [0801: DATE and TIME,
Date/Time]. The IRIG-B signal does not contain the current year so it will need to be
set manually in this cell.
In the event of the auxiliary supply failing, with a battery fitted in the compartment
behind the bottom access cover, the time and date will be maintained. Therefore,
when the auxiliary supply is restored, the time and date will be correct and not need
to be set again.
To test this, remove the IRIG-B signal, then remove the auxiliary supply from the relay.
Leave the relay de-energised for approximately 30 seconds. On re-energisation, the
time in cell [0801: DATE and TIME, Date/Time] should be correct.
Reconnect the IRIG-B signal.