| 摘要 |
<p>PURPOSE:To indirectly detect the defect of a brushless exciter by judging whether the amplitude of a brushless exciter exciting current falls within the prescribed range with respect to the operating state of a synchronous machine or not. CONSTITUTION:When a current of the maximum allowable exciting current value or higher flows for a time set by a timer 22 or longer, a brushless exciter defect detection signal 36 is generated through an OR gate 35. When a breaker open signal 26 is generated and a detection signal 25 of (n) times of a no-load rated exciting current is generated, a signal is applied through an AND gate 27 to a timer 28. When a reactive power relay phase advancing side operation signal 32 is generated and a rates exciting current value or higher detection signal 31 is generated, a signal is applied through an AND gate 33 to a timer 34.</p> |
