P341/EN O/B11 Operation Guide
CHAPTER 3 Commissioning and
Page 10/80 Maintenance
MiCOM P341
The insulation resistance should be greater than 100Mý at 500V.
On completion of the insulation resistance tests, ensure all external wiring is correctly
reconnected to the unit.
4.1.4 External wiring
Check that the external wiring is correct to the relevant relay diagram or scheme
diagram. The relay diagram number appears on the rating label under the top
access cover on the front of the relay. The corresponding connection diagram will
have been supplied with the ALSTOM order acknowledgement for the relay.
If an MMLG test block is provided, the connections should be checked against the
scheme (wiring) diagram. It is recommended that the supply connections are to the
live side of the test block (coloured orange with the odd numbered terminals (1, 3, 5,
7 etc.)). The auxiliary supply is normally routed via terminals 13 (supply positive) and
15 (supply negative), with terminals 14 and 16 connected to the relay’s positive and
negative auxiliary supply terminals respectively. However, check the wiring against
the schematic diagram for the installation to ensure compliance with the customer’s
normal practice.
4.1.5 Watchdog contacts
Using a continuity tester, check that the watchdog contacts are in the states given in
Table 2 for a de-energised relay.
Contact State
Terminals
Relay De-energised Relay Energised
F11 – F12 Closed Open
F13 – F14 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 Operating Range AC Operating Range
24 – 48V [ – ] 19 to 65V –
48 – 125V [30 - 100] 37 to 150V 24 to 110V
110 – 250V [100 - 240V] 87 to 300V 80 to 265V
Table 3: Operational range of auxiliary supply Vx
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.
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