Technical Guide P92x/EN CM/E11
Commissioning Guide
MiCOM P921-P922-P923 Page 7/28
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4. PRODUCT CHECKS
These product checks cover all aspects of the relay which should be checked to
ensure that it has not been physically damaged prior to commissioning, is functioning
correctly and all input quantity measurements are within the stated tolerances.
If the application-specific settings have been downloaded to the relay prior to
commissioning, it is advisable to make a copy of the settings so as to allow their
restoration later. To do this use one of the methods described below:
· Obtain a setting file on a diskette from the customer (this requires a portable PC
with appropriate setting software, e.g. MiCOM S1).
· Extract the settings from the relay itself (this again requires a portable PC with
appropriate setting software).
· Manually create a setting record. This can be done using a copy of the setting
record located in chapter P92x/EN RS to record the settings as the relay’s menu is
sequentially stepped through via the front panel user interface.
If password protection is enabled and the customer has changed the password to
prevent changes to some of the settings, either the revised password should be
provided, or the customer should restore the original password prior to
commencement of testing.
NOTE: In the event that the password has been lost, a recovery
password can be obtained from AREVA by quoting the serial
number of the relay.
4.1 With the relay de-energised
THE FOLLOWING GROUP OF TESTS SHOULD BE CARRIED OUT WITHOUT THE
AUXILIARY SUPPLY BEING APPLIED TO THE RELAY AND WITH THE TRIP CIRCUIT
ISOLATED.
The voltage transformer connections must be isolated from the relay for these checks.
If an MMLG test block is provided, the required isolation can easily be achieved by
inserting test plug type MMLB01 which effectively open-circuits all wiring routed
through the test block.
Before inserting the test plug, reference should be made to the scheme (wiring)
diagram to ensure that this will not potentially cause damage or a safety hazard.
If a test block is not provided, the voltage transformer supply to the relay should be
isolated by means of the panel links or connecting blocks. Where means of isolating
the auxiliary supply and trip circuit (e.g. isolation links, fuses, MCB, etc.) are provided,
these should be used. If this is not possible, the wiring to these circuits will have to be
disconnected and the exposed ends suitably terminated to prevent them from being a
safety hazard.
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