Study on Diagnostic Method of Compound Boundary in Medium Voltage Cross-linked Cable Joints Moistened

YANG Fan; ZENG Chun; RUAN Ling; CHEN Junwu; ZHANG Yaodong

doi:10.13296/j.1001-1609.hva.2014.05.002

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Study on Diagnostic Method of Compound Boundary in Medium Voltage Cross-linked Cable Joints Moistened

更新时间：2025-04-26

- Study on Diagnostic Method of Compound Boundary in Medium Voltage Cross-linked Cable Joints Moistened
- High VoltageApparatus Vol. 50, Issue 5, Pages: 1-5(2014)
- 作者机构：
  
  1. 国网湖北省电力公司电力科学研究院,国家电网公司电气设备现场试验技术重点实验室
  2. 华中科技大学电气与电子工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2014.05.002
  CLC： TM855
- Published：2014
- 稿件说明：
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[1]杨帆,曾莼,阮羚,陈俊武,张耀东.中压交联电缆接头复合界面受潮缺陷的诊断方法研究[J].高压电器,2014,50(05):1-5.

YANG Fan, ZENG Chun, RUAN Ling, et al. Study on Diagnostic Method of Compound Boundary in Medium Voltage Cross-linked Cable Joints Moistened[J]. High voltageapparatus, 2014, 50(5): 1-5.
[1]杨帆,曾莼,阮羚,陈俊武,张耀东.中压交联电缆接头复合界面受潮缺陷的诊断方法研究[J].高压电器,2014,50(05):1-5. DOI： 10.13296/j.1001-1609.hva.2014.05.002.

YANG Fan, ZENG Chun, RUAN Ling, et al. Study on Diagnostic Method of Compound Boundary in Medium Voltage Cross-linked Cable Joints Moistened[J]. High voltageapparatus, 2014, 50(5): 1-5. DOI： 10.13296/j.1001-1609.hva.2014.05.002.

摘要

电缆中间接头复合界面受潮是中压交联电缆的常见缺陷

在运行的过程中会导致界面表面电阻下降

进而产生沿面放电

逐渐降低电缆的绝缘性能

甚至直接导致电缆中间接头绝缘击穿事故

给电缆线路的安全稳定运行带来严重隐患。笔者根据电缆中间接头的结构特征建立了复合界面受潮缺陷的等效电路模型

仿真分析了不同程度受潮缺陷下

注入脉冲信号的时域反射波形图谱及其典型特征。提出了一种采用基于注入脉冲信号时域反射波法检测与定位电缆中间接头复合界面不同程度受潮缺陷的方法

并通过工业应用案例验证了该方法的有效性。

Abstract

As the main problem of MV XLPE cable

the compound boundary in MV XLPE cable joints moistened reduced the surface resistance which will lead to creeping discharge and cause a sharp decline in insulation performance

and may make joints breakdown. These hidden troubles affect the safe and stable operation of XLPE cable. Based on the compound boundary of the cable joint

this paper has established the equivalent circuit model. Simulation analyses characteristics of time-domain of wave reflection in the different degree of the joints moistened by injecting pulse signal. This paper proposes an approach to detect and locate the cable intermediate joint composite interface be affected with different degree of the joints moistened based on the injection pulse signal time domain reflection wave. The effectiveness of the proposed method is verified by practical engineering testing.

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