Investigation on the Sensitivity of the UHF Method for Partial Discharge Detection in GIS

LI Xiao; XU Yang; WANG Yong; LI Xing; XIONG Jun; LIU Weidong

doi:10.13296/j.1001-1609.hva.2018.05.010

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Investigation on the Sensitivity of the UHF Method for Partial Discharge Detection in GIS

更新时间：2025-04-26

- Investigation on the Sensitivity of the UHF Method for Partial Discharge Detection in GIS
- High VoltageApparatus Vol. 54, Issue 5, Pages: 63-67+73(2018)
- 作者机构：
  
  1. 广州供电局有限公司电力试验研究院
  2. 清华大学电机系电力系统及发电设备控制与仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.05.010
  CLC： TM595
- Published：2018
- 稿件说明：
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[1]李晓,徐洋,王勇,李星,熊俊,刘卫东.GIS局部放电特高频检测方法灵敏度的研究[J].高压电器,2018,54(05):63-67+73.

LI Xiao, XU Yang, WANG Yong, et al. Investigation on the Sensitivity of the UHF Method for Partial Discharge Detection in GIS[J]. High voltageapparatus, 2018, 54(5): 63-67+73.
[1]李晓,徐洋,王勇,李星,熊俊,刘卫东.GIS局部放电特高频检测方法灵敏度的研究[J].高压电器,2018,54(05):63-67+73. DOI： 10.13296/j.1001-1609.hva.2018.05.010.

LI Xiao, XU Yang, WANG Yong, et al. Investigation on the Sensitivity of the UHF Method for Partial Discharge Detection in GIS[J]. High voltageapparatus, 2018, 54(5): 63-67+73. DOI： 10.13296/j.1001-1609.hva.2018.05.010.

摘要

GIS局部放电特高频UHF在线检测得到了广泛的实际应用

但对GIS绝缘子的闪络故障还缺少有效的预警能力

由此引起了对UHF检测方法灵敏度的极大关注。文中对一个实际GIS支撑绝缘子的实际局部放电进行了实验研究

结果表明

局部放电UHF检测方法确实存在灵敏度的死角。该支撑绝缘子的局部放电的脉冲电流陡度在很大的范围内变化

所产生的电磁波的频带也在很大范围内变化

但大部分局部放电的电磁波频率低于UHF频段

不能够被UHF检测方法有效检测。由此推断

在局部放电UHF检测中

严重的局部放电未必表现为高脉冲幅值和高脉冲频度

有可能被现有的诊断机制所忽略。

Abstract

UHF detection of partial discharges（PD）in GIS has been widely used

however its capability of pre-warn-ing the flashover failures of the GIS insulators is limited

causing a big concern on the sensitivity of the UHF method.Experimental investigation is made in this paper on the PDs in an actual GIS supporting insulator with actual defect

which demonstrates that the UHF method does have blind angle in sensitivity. The PD pulses of the supporting insula-tor change greatly in there steepness

causing great change of the frequency band of the RF signals from the PDs.Most of the PDs have RF signals lower than UHF band

and cannot be detected by UHF method. It means that seri-ous PDs of the GIS insulator could possibly show UHF pulses of small amplitude and small density

and easily be ne-glected according to the current diagnosing criteria.

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