Commissioning and Maintenance
P746/EN
CM/F21
MiCOM P746
(CM) 10-9
CM
4.1.3 Insulation
Insulation resistance tests are only necessary during commissioning if it is required for them
to be done and they have not been performed during installation.
Isolate all wiring from the earth and test the insulation with an electronic or brushless
insulation tester at a dc voltage not exceeding 500V. Terminals of the same circuits should
be temporarily connected together.
The main groups of relay terminals are:
a) Current transformer circuits
b) Auxiliary voltage supply.
c) Field voltage output and opto-isolated control inputs.
d) Relay
contacts.
e) Case
earth.
The insulation resistance should be greater than 100M
Ω
at 500V.
On completion of the insulation resistance tests, ensure all external wiring is correctly
reconnected to the relay.
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
Schneider Electric order acknowledgement for the relay.
If a P991 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
M11 – M12
Closed
Open
M13 – M14
Open
Closed
TABLE 2: WATCHDOG CONTACT STATUS
Содержание MiCOM P746
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