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10 INSTALLATION AND MAINTENANCE
10.3 MAINTENANCE
10.3MAINTENANCE
Given the important role that the protection relays play in the operation of any installation, a periodical program of tests is
highly recommended. The unit incorporates built-in diagnostic functions that permit immediate identification with only the
aid of the keypad and display, the detection of some of the most likely circuit failures. Testing the unit is recommended at
intervals of 2 years or more. Although the built-in diagnosis does not reduce the average time between failures, it does
increase the availability of the protection because it allows a drastic reduction in the average interruption time involved in
detecting and repairing the fail.
The set of tests that can be carried out to test that all the features of the MIFII unit function properly is described in detail in
the chapter entitled COMMISSIONING.
10
GEK-106237O
MIFII Digital Feeder Relay
10-3
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