ROTARY RECTIFIER FAULT DETECTOR AND ROTARY RECTIFIER FAULT DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To prevent false detection of rotary rectifier fault.;SOLUTION: A rotary rectifier fault detector includes phase detection means for detecting the output voltage phase of an auxiliary exciter 6 connected directly with an AC exciter for supplying an AC power to a rotary rectifier 1C, or the output voltage phase of a synchronous machine 1A, current detection value data string generation means for generating the exciter field current detection value data string by sampling the exciter field current Ief of an AC exciter 1B every time when the phase advances by a predetermined angle, differential signal data string generation means for generating a differential signal data string by performing difference calculation for the exciter field current detection value data string at predetermined intervals; and rotary rectifier fault alarm output means for outputting an alarm indicating rotary rectifier fault, when there is such an event that the level of the differential signal data string exceeds certain positive threshold and negative threshold, respectively, to the positive side and negative side, in one period of the output voltage of the AC exciter 1B.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT