Research on Measurement and Localization Techniques for Low-Occurrence Partial Discharge During UHV GIS Field Insulation Tests

Liu; Yuchen; Li; Hongbing; Xu; Zhangxin; Wu; Chuanqi

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Research on Measurement and Localization Techniques for Low-Occurrence Partial Discharge During UHV GIS Field Insulation Tests

更新时间：2026-09-21

- Research on Measurement and Localization Techniques for Low-Occurrence Partial Discharge During UHV GIS Field Insulation Tests
- High VoltageApparatus (2026)
- 作者机构：
  
  国网湖北省电力有限公司电力科学研究院湖北　武汉 430070
  1.国家电网有限公司高压电气设备现场试验与评估技术实验室湖北　武汉 430070
  2.国网湖北省电力有限公司湖北　武汉 430048
  3.中国电力科学研究院北京 100192
  4.清华四川能源互联网研究院四川成都 610213
  5.Sichuan Energy Internet Research Institute of Tsinghua University, Chengdu, 610213, China
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：15 June 2026，
  
  Revised：2026-09-03，
  
  Accepted：07 September 2026，
- 稿件说明：
移动端阅览
Liu, Yuchen, Li, et al. Research on Measurement and Localization Techniques for Low-Occurrence Partial Discharge During UHV GIS Field Insulation Tests[J/OL]. High VoltageApparatus, 2026.
DOI：

Liu, Yuchen, Li, et al. Research on Measurement and Localization Techniques for Low-Occurrence Partial Discharge During UHV GIS Field Insulation Tests[J/OL]. High VoltageApparatus, 2026. DOI：

摘要

现场绝缘试验是GIS投运前检验设备可靠性最经济有效的环节，然而，目前以特高频和超声波带电检测为代表的现场绝缘试验局放监测技术在监测有效时长、局放灵敏度、现场应用判据等方面均存在不足。为此，本文提出了一种适用于特高压GIS现场绝缘试验全过程的局部放电高灵敏检测方法，能够实现试验过程中所有局部放电信号原始脉冲的测量与分析，并通过“试验电压特征采集-局放采集单元外部触发”的方式，实现了现场试验工况中非工频电压下的局放图谱准确测量；研究了基于相干平均的特高频局部放电信号去噪算法，在现场实测中可将背景高频噪声从20mV左右降至1mV以下；在某特高压站1100kV GIS现场试验中进行了现场应用，成功发现了某台断路器中金属异物引发的局放异常现象，开盖检查发现了异物烧蚀痕迹并进行了消缺处理，验证了本文局放检测方法、信号处理方法的有效性。

Abstract

Field insulation testing is the most cost-effective and efficient means of verifying equipment reliability before GIS commissioning. However

current partial discharge (PD) monitoring technologies used in field insulation tests

typically represented by UHF and ultrasonic live detection

have shortcomings in terms of effective monitoring duration

PD sensitivity

and field application criteria. To address these issues

this paper proposes a highly sensitive PD detection method suitable for the entire process of field insulation testing of UHV GIS. The method enables the measurement and analysis of all raw PD signal pulses during the test

and by adopting an approach of “test voltage characteristic acquisition – external triggering of the PD acquisition unit

” it achieves accurate PD pattern measurement under non-power-frequency voltage conditions encountered in field testing. A UHF PD signal denoising algorithm based on coherent averaging is investigated

which can reduce the background high-frequency noise from around 20 mV to below 1 mV in field measurements. The proposed method was applied during the field testing of a 1100 kV GIS at a UHV substation

where it successfully detected an abnormal PD phenomenon caused by metallic foreign objects inside a circuit breaker. Subsequent internal inspection after opening the cover revealed ablation traces from the foreign object

and the defect was eliminated. These results validate the effectiveness of the proposed PD detection method and signal processing approach.

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references

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