P44x/EN CM/E33
Commissioning
Page 10/54
MiCOM P441/P442 & P444
4.1.5
Watchdog Contacts
Using a continuity tester, check that the normally closed watchdog contacts are in the states
given in table 2 for a de-energised relay.
Terminals Contact
State
Relay De-energised
Relay Energised
F11-F12
J11-J12
N11-N12
(P441)
(P442)
(P444)
Closed Open
F13-F14
J13-J14
N13-N14
(P441)
(P442)
(P444)
Open Closed
TABLE 2 - WATCHDOG CONTACT STATUS
4.1.6 Auxiliary
Supply
The relay can be operated from either a dc only or an ac/dc auxiliary supply depending on
the relay’s nominal supply rating. The incoming voltage must be within the operating range
specified in table 3.
Without energising the relay, measure the auxiliary supply to ensure it is within the operating
range.
Nominal Supply Rating
DC [AC rms]
DC Operating Range
AC Operating Range
24/54V [-]
19
-
65V
-
48/110V
[30/100V]
37 - 150V
24 - 110V
110/250V
[100/240V]
87 - 300V
80 - 265V
TABLE 3 - OPERATIONAL RANGE OF AUXILIARY SUPPLY
It should be noted that the relay can withstand an ac ripple of up to 12% of the upper rated
voltage on the dc auxiliary supply.
DO NOT ENERGISE THE RELAY USING THE BATTERY CHARGER WITH THE BATTERY
DISCONNECTED AS THIS CAN IRREPARABLY DAMAGE THE RELAY’S POWER
SUPPLY CIRCUITRY.
Energise the relay 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.
4.2.1 Watchdog
Contacts
Using a continuity tester, check the watchdog contacts are in the states given in table 3 for
an energized relay.
4.2.2
Date and Time
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.
Содержание MiCOM P441
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