Research on fault location and state evaluation method of diagnostic function for power cable insulation defects based on the impedance spectrum

SI Jie; CHEN Zhi; ZHAO Jian; ZHOU Yuxiao

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Research on fault location and state evaluation method of diagnostic function for power cable insulation defects based on the impedance spectrum

更新时间：2025-11-15

- Research on fault location and state evaluation method of diagnostic function for power cable insulation defects based on the impedance spectrum
- Vol. 62, Issue 7, (2025)
- 作者机构：
  
  浙江图盛输变电工程有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2025
- 稿件说明：
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SI Jie, CHEN Zhi, ZHAO Jian, et al. Research on fault location and state evaluation method of diagnostic function for power cable insulation defects based on the impedance spectrum[J]. 2025, 62(7).
DOI：

SI Jie, CHEN Zhi, ZHAO Jian, et al. Research on fault location and state evaluation method of diagnostic function for power cable insulation defects based on the impedance spectrum[J]. 2025, 62(7). DOI：

摘要

在电力电缆绝缘缺陷检测工作中，绝缘缺陷的准确定位和程度评估对计划性检修工作的实施至关重要。文中以XLPE同轴电缆为例，基于传输线分布参数模型和积分变换理论，用e-2γx函数系对电力电缆阻抗谱函数进行空间域上的分解，提出了一种绝缘缺陷诊断函数。通过研究绝缘缺陷与绝缘缺陷函数的关系，针对电力电缆L/C型绝缘缺陷的定位和程度评估，提出了一种绝缘缺陷检测方法。通过仿真算例验证了该检测方法的可行性，并通过仿真结果分析了其缺陷定位和程度评估的准确性。

Abstract

In the detection of power cable insulation defects

the accurate location and degree evaluation of insulation defects are crucial to the planned overhaul work of power cable. Taking XLPE coaxial cable as an example

in this paper

based on the transmission line distribution parameter model and the integral transformation theory

the impedance spectrum function of the power cable is decomposed through the e-2γx function system in the space domain

and a diagnostic function for insulation defects is proposed. By investigating the relationship between insulation defects and insulation defect function

an insulation defects detection method is proposed for the location and degree evaluation of L/C type insulation defects in power cable. The feasibility of the proposed detection method is verified by a simulation example

which can accurately locate and evaluate the degree of the insulation defects.

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华东交通大学电气与电子工程学院

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