Answer Posted / k.prakashchandra

Another probability. If there is any earth fault before the
GT primary bushings ,the gen may trip on SEFR if voltage
based( open delta) relay is used.Then you have to check
cable,termination glands and the stator winding for earth
fault either by meggering or better by applying rated voltage.

i have a 4 Mva transformer 34.5 kv / 480-277 v and i used 2 parallel 3200 amp bus duct for the secondary feeder using 3 ply of bus bar ( 3/8" x 5" ) as a common where the flexible link terminated and 6300 amps breaker for the main, the lower bus duct reaches 70 degrees and the upper bus duct reaches 55 degrees when i used thermal scanner. why the temperature is not balance when the load reaches 3600 amps.

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