Field Test Analysis of On-line VHF PD Monitoring for Generators

XU Yang1; HU Xiao1; YANG Chu-ming2; ZHANG Zheng-ping2; LA Yuan2

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Field Test Analysis of On-line VHF PD Monitoring for Generators

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- Field Test Analysis of On-line VHF PD Monitoring for Generators
- High VoltageApparatus Vol. 45, Issue 2, Pages: 48-52+56(2009)
- 作者机构：
  
  1. 西安交通大学电力设备电气绝缘国家重点实验室
  2. 广东电网公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM835
- Published：2009
- 稿件说明：
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[1]徐阳,胡晓,杨楚明,张征平,喇元.发电机局部放电甚高频在线监测现场试验分析[J].高压电器,2009,45(02):48-52+56.

XU Yang1, HU Xiao1, YANG Chu-ming2, et al. Field Test Analysis of On-line VHF PD Monitoring for Generators[J]. High voltageapparatus, 2009, 45(2): 48-52+56.
[1]徐阳,胡晓,杨楚明,张征平,喇元.发电机局部放电甚高频在线监测现场试验分析[J].高压电器,2009,45(02):48-52+56. DOI：

XU Yang1, HU Xiao1, YANG Chu-ming2, et al. Field Test Analysis of On-line VHF PD Monitoring for Generators[J]. High voltageapparatus, 2009, 45(2): 48-52+56. DOI：

摘要

笔者研制了发电机局部放电甚高频在线监测系统

该系统基于双传感器定向耦合的原理进行信号采集

利用数字脉冲逐个识别技术通过软件来实现干扰抑制。结合在四川龚嘴电厂、福建池潭电厂等地的现场实验分析

验证了该系统的测试效果及其抗干扰能力。通过对某电厂发电机连续在线监测及故障预警的分析

证实了相比单一的放电量分析

采用统计参数趋势分析的方法能够更有效地反映发电机放电变化趋势。

Abstract

An on-line partial discharge monitoring system for generators using very high frequency range was proposed and has been applied to several hydro-plants in Gongzui

Sichuan Province and Chitan

Fujian Provence

ect.In this system

double capacitive couplers are installed close to the HV outlet terminal to obtain the single pulse waveform

and external disturbance can be separated from stator winding partial discharge via software by using the pulse-by-pulse analysis method.The consistent monitoring for a generator in a power plant was performed and failures were detected successfully.Analyses of the failures suggest that the method of trend analysis to statistical parameters is more effective in reflecting the insulation state of a generator

compared with the apparent charge method.

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