The Application And Analyse Of A New Method For Monitoring Rotating Rectifier Faults Of Brushless Generator Exciter

Brushless rotating rectifier bridge is the key equipment in the system, but rotating rectifier fault monitoring component that restricts the difficulties of the development of this exciting way to one of the obstacles. Therefore, the rotating rectifier fault line fault diagnosis technology is of great practical significance, has a good application prospect.This article first introduces a 330MW power plant to use the ALSTOM generator rotating non-conducting diode detection system (DNC) in the profile, described rotating diode fault detection application of new technologies, engineering background and significance. Brushless exciter with a power plant as the research object, from a theoretical point of view of the rotating diodes under normal and fault condi t ions and the field winding current waveform of armature EMF harmonics, given the characteristics of the waveform law, and the normal and the rotating rectifier some typical simulation results under fault conditions consistent comparison. On this basis, the proposed exci tat ion current spectrum analysis based on fault diagnosis. From the hardware, software, principles and main functions of the three aspects, detailed spectral analysis based on the rotation of the excitation current fault detector diode overall design.The device in the factory 330MW generat ing uni t s were support ing the brushless exciter and test engineering applications, the test data were analyzed to verify the use of the device to accurately determine the normal state of rotating rectifier, a phase open and two-phase open-circuit fault better performance than the current detection system for the safe operation of the unit to provide technical support.