GE Multilin MIGII Instruction Manual page 181

10 INSTALLATION AND MAINTENANCE 10.3 MAINTENANCE
10.3MAINTENANCE
Given the important role that protection relays play in the operation of any installation, a periodic program of tests is highly
recommended. The unit incorporates built-in diagnostic functions that permit immediate identification, with only the aid of
keypad and display, of some of the most likely circuit failures. It is recommended that the unit be tested at least every 5
years. Although the built-in diagnosis does not reduce the average time between failures, it increases the availability of
the protection because it allows a drastic reduction in the average interruption time involved in detecting and repairing the
failure.
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GEK- 113188A 10-3