ABB Relion REG650 Commissioning Manual page 95

1MRK 502 035-UEN A
Restoring
Maintenance is very important to improve the availability of the protection system by
detecting failures before the protection is required to operate. There is however little point in
testing healthy equipment and then putting it back into service with an open terminal, with a
removed fuse or open miniature circuit breaker with an open connection, wrong setting, and
so on.
Thus a list should be prepared of all items disturbed during test so that all can be put back into
service quickly and without overlooking something. It should be put back into service item by
item and signed by the responsible engineer.
Generator protection REG650
Commissioning manual
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Commissioning and maintenance of the fault clearing system
Section 8
SEMOD56528-36 v2
89