Areva MiCOM P441, Technical Manual

Page: 449 / 636

Commissioning P44x/EN CM/E33
MiCOM P441/P442 & P444 Page 9/54
Shorting contact between terminals Current Input
1A CT’s 5A CT’s
IA C3-C2 C1-C2
IB C6-C5 C4-C5
IC C9-C8 C7-C8
IM C12-C11 C10-C11
TABLE 1 - CURRENT TRANSFORMER SHORTING CONTACT LOCATIONS
4.1.3 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
AREVA 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.
4.1.4 Insulation
Insulation resistance tests only need to be done during commissioning if it is required for
them to be done and they haven’t 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) Voltage transformer circuits.
b) Current transformer circuits
c) Auxiliary voltage supply.
d) Field voltage output and opto-isolated control inputs.
e) Relay contacts.
f) S485 communication port.
g) 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 unit.