Abstract: The two familiar main bus connection of gas turbine generator was introduced, the prescription about generator normal status was explained, a burned-out accident of knife switch at the generator outlet and an accidental closing of generator main breaker were described. The actuation of normal generator protection device under the case of main generator beaker accidental closing was analyzed, the status of gas turbine generator, which is running at daytime and stopping at night, was discussed also.

Key words: status of generator, generator circuit breaker (GCB), protection configuration, abnormal example, analysis and investigation