水电机组局部放电在线监测的干扰抑制技术研究

Study on the interference suppression technique in partial discharge on-line monitoring of hydropower unit

大型发电机组作为系统内的主电源,是电力系统的关键设备,局部放电是影响发电机定子绝缘体系故障的重要因素,亦是发电机定子绝缘劣化的重要标志,局部放电在线监测已成为评价发电机定子故障诊断的最有效手段之一,针对水电机组局部放电在线监测中干扰抑制难题,在总结各类典型干扰特征及表现形式的基础上,结合不同的传感器安装方式及安装位置,介绍了不同的现场干扰抑制方法,重点介绍了各种干扰抑制方法的基本技术原理,可为水轮发电机局部放电在线监测系统的设计、研制提供技术参考。

Large power generator is the main power supply system and the key equipment in power system.Partial Discharge(PD) is not only an important factor that will lead to the failure of the generator stator insulation system,but also an important sign of the deterioration in the generator stator insulation,so the PD on-line monitoring of large power generator has become one of the most effective means of generator stator fault diagnosis and evaluation.However,for PD on-line monitoring,the most difficult problem is to suppress the local interference.Based on summing up the various typical interference characteristics and forms,the different interference suppression methods which are relative to different sensor installation position are introduced in this paper,and then the basic technical principle of various interference suppression methods are introduced,which can provide technical reference for the development and design of the PD on-line monitoring system for hydropower generator.