Class-C Protection:
When a fault in equipment outside
the “UNIT” is not isolated for some reason by the relays/switchgear of that
equipment, has to be cleared by “back up” relays provided in the generator
protection system. In such cases it is sufficient to isolate the unit from the
system side and “run it back to house load” which will be supplied by the
Generator to the 6.6 KV systems through UAT. Such trips when only 400 KV
breakers (generator main CB) are opened are called “Class-C Trips”.
After restoration of normalcy in
the system, the generator can be resynchronized. Such trip also initiates HP
and LP by pass arrangement to save boiler from probable tripping.
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