交、直流电压下126 kV GIS支柱绝缘子内部气泡缺陷局部放电特性

刘卫东; 许渊; 尹泽; 赵科; 冯瑞; 杜非

doi:10.13296/j.1001-1609.hva.2026.08.014

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交、直流电压下126 kV GIS支柱绝缘子内部气泡缺陷局部放电特性

研究与分析 | 更新时间：2026-08-12

- 交、直流电压下126 kV GIS支柱绝缘子内部气泡缺陷局部放电特性
- Partial Discharge Characteristics of Void Defect Inside A 126 kV GIS Post Insulator Under AC and DC Voltages
- 高压电器 2026年62卷第8期页码：107-115
- 作者机构：
  
  清华大学电机工程与应用电子技术系，北京 100084
  中国电力科学研究院有限公司，北京 100192
  国网江苏省电力有限公司电力科学研究院，南京 211103
- 作者简介：
  
  刘卫东（1961—），男，研究员，主要从事电力设备状态检测和诊断、SF6断路器开断特性、电力系统操作暂态的测量、分析和抑制、电力系统故障电流限制器技术（通信作者）（E-mail：lwd dea@mail. tsinghua.edu.cn）。
- 基金信息：
  
  国家电网公司总部科技项目;Science and Technology Project of State Grid Corporation of China(5200-202455087A-1-1-ZN)
- DOI：10.13296/j.1001-1609.hva.2026.08.014
  中图分类号：
- 收稿：2026-02-15，
  
  修回：2026-04-22，
  
  纸质出版：2026-08-16
- 稿件说明：
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刘卫东, 许渊, 尹泽, 等. 交、直流电压下126 kV GIS支柱绝缘子内部气泡缺陷局部放电特性[J]. 高压电器, 2026,62(8):107-115.

LIU Weidong, XU Yuan, YIN Ze, et al. Partial Discharge Characteristics of Void Defect Inside A 126 kV GIS Post Insulator Under AC and DC Voltages[J]. High Voltage Apparatus, 2026, 62(8): 107-115.
刘卫东, 许渊, 尹泽, 等. 交、直流电压下126 kV GIS支柱绝缘子内部气泡缺陷局部放电特性[J]. 高压电器, 2026,62(8):107-115. DOI： 10.13296/j.1001-1609.hva.2026.08.014.

LIU Weidong, XU Yuan, YIN Ze, et al. Partial Discharge Characteristics of Void Defect Inside A 126 kV GIS Post Insulator Under AC and DC Voltages[J]. High Voltage Apparatus, 2026, 62(8): 107-115. DOI： 10.13296/j.1001-1609.hva.2026.08.014.

摘要

环氧绝缘件作为气体绝缘开关设备（gas insulated switchgear，GIS）的重要组成部分，在浇注过程中可能产生气泡、裂纹等内部缺陷，影响设备运行可靠性。文中以实际存在内部气泡缺陷的126 kV支柱绝缘子为对象，开展交、直流电压下局部放电试验研究，对比了不同电压下绝缘内部气泡缺陷的局部放电特征差异。结果表明，该缺陷在交流和直流电压下的局部放电特性差异显著。交流电压下，放电信号频发，且在工频正负半周期内对称分布；最大放电量超过80 pC，脉冲电流信号重复率超过500次/s；特高频信号幅值最大350 mV左右，信号重复率维持在80～100次/s之间，远低于脉冲电流信号重复率。直流电压下，放电信号极为偶发，1 h内仅几次至几十次，甚至数小时内无任何放电信号。脉冲电流信号主要出现在电压上升期间，电压稳定后仅有少量低幅值信号；特高频信号频次远低于脉冲电流，且仅在电压上升过程中出现1～2次放电信号。直流电压下，放电量最大超过20 pC，特高频信号幅值最大约600 mV。文中研究结果可为评估交、直流电压下GIS绝缘内部缺陷危险程度提供有效支撑。

Abstract

Epoxy insulation part is an important component of gas insulated switchgear(GIS)

and such internal defects as voids and cracks may be generated during the casting process

which can affect the operation reliability of equipment. In this paper the 126 kV post insulator with void defect is taken as the object

the partial discharge(PD) test at AC and DC voltages is performed

and the differences in PD characteristics of internal void defect of the insualtor under different voltages are compared. The results indicate that PD characteristics of the same defect exhibit significant differences under AC and DC voltages. In case of AC voltage

the discharge signals occur frequently and are symmetrically distributed within the positive and negative half cycles of the power voltage. The maximum discharge amagnitude exceeds 80 pC and the repetition rate of pulse current signals exceeds 500 times/s. The maximum amplitude of ultra-high frequency(UHF)signals is about 350 mV

and the repetition rate of UHF signal is maintained between 80~100 times/s

far lower than that of pulse current signal. In case of DC voltage

discharge signals are extremely sporadic

with only a few to a dozen discharges within 1 h

and even no discharge for several hours.Pulse current signals primarily appear during the voltage rise process

and only a few low-amplitude signals are present after the voltage stabilizes. The repetition rate of UHF signals is much lower than that of the pulse cur rent signals

and only 1~2 UHF signals appear during the voltage rise process. In case of DC voltage

the maximum apparent charge can exceed 20 pC

and the UHF signal amplitude is approximately 600 mV. The research results in this paper can provide effective support for assessing the hazard level of internal insulatino defect in GIS under AC and DC voltages.

关键词

Keywords

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