| 摘要 |
PURPOSE:To improve reliability, by confirming increasing/decreasing condition of bus voltage based on the output state of a voltage control signal and operating the direction of difference of reactive power and increase/decrease condition of voltage when the difference of reactive power exceeds over a predetermined level and judging that a generator failed. CONSTITUTION:In case of parallel operation, reference reactive power per a single generator is operated in an operating section 9 based on total reactive power of generators 1a, 1b and preset rated capacity ratio between the generators 1a, 1b so as to obtain the difference between the reference reactive power and the reactive power born by the generators 1a, 1b. Increase/decrease condition of voltage of a bus A is confirmed based on the output condition of a voltage control signal when the voltages of the generators 1a, 1b are controlled while based on variation of voltage from that at a predetermined time before when voltage control of the generators 1a, 1b is stopped. Upon judgement that the difference of reactive power is higher than a predetermined level, direction of difference of reactive power and increase/decrease condition of voltage are operated logically in the operating section 9 so as to judge failure of generator. |
