Areva MiCOM P125, Technical Manual

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P12y/EN CM/C22 Commissioning and Maintenance
Page 6/24 MiCOM P125/P126 & P127
3. PRODUCT VERIFICATION TESTS
3.1 Allocation of terminals
It is necessary to consult the appropriate wiring diagram provided in the chapter
P12y/EN CO of this Technical Guide whilst observing the various polarities and ground/earth
connection.
3.2 Electrostatic discharge (ESD)
Before any handling of the module (active part of the relay), please refer to the
recommendations in Safety Section of this Technical Guide.
3.3 Visual inspection
Carefully examine the relay to see if there has been any possible deterioration following
installation.
Check if the external wiring corresponds to the appropriate relay diagram or the assembly
diagram. The reference number of the relay diagram is indicated on a label situated under
the upper flap of the front panel.
When the relay is outside from its case, use a continuity tester to test that the current short-
circuits (phases and earth CT's) between the terminals indicated on the wiring diagram are
closed.
3.4 Earthing
Check if the earth connection of the case situated above the rear terminal block is used to
connect the relay to a local earth bar. With several relays present, make sure that the copper
earth bar is properly installed for solidly connecting the earthing terminals of each case.
3.5 Current transformers (CT's)
DANGER : NEVER OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENT
TRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BE
LETHAL AND coULD DAMAGE INSULATION.