大型发电机局部放电在线监测仪的研究

局部放电在线监测是大型发电机绝缘诊断的重要方法。本文介绍了所研制的一套宽频局部放电在线监测系统，它可正确识别实验室模拟的几种典型局部放电。最后给出了现场监测大型发电机运行工况的实际测试结果。

Study on Instrument for PD On-line Monitoring of Large Generators

Large generator is one of the most important equipment in power system. Recently with the development of rated voltage and capacity,large generators are expected to have higher reliability of insulation structure and service.Partial discharge(PD) on line mo nitoring can effectively find out the condition of electrical insulation so as to indicate the defect.Thus forced outages, reduced reliability and increased maintenance and repair costs can be avoided.The study on PD on line monitoring in large generators is of theoretical and practical values. In this paper, a new digital on line monitoring system are developed.The digital partial discharge on line monitoring system can inform the operator not only conventional discharge parameter,but also the discharge results both in time domain and in frequency domain.Statistic characteristics can also be given by the monitoring system on the monitor screen.This monitoring system can also be used to follow the track of large generator aging.The on line monitoring system is on the basis of IBM486 personal computer.The software has directly perceived Chinese interface, and the measurement parameter can be set in the parameter menu easily. The operation of the monitoring system is simple and convenient.Several typical simulated PDs can be recognized by using this new instrument,which indicate that the instrument can meet the need of on line monitoring very well.Some on line PD monitoring results of large turbine generator are also given in this paper.