Application of Dielectric Response in Diagnoses of Time and Frequency Domain on XLPE Cable Insulation

ZHAO Aixuan; CHEN Xi; XU Long; LI Jiaming; DENG Junbo; ZHANG Guanjun

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Application of Dielectric Response in Diagnoses of Time and Frequency Domain on XLPE Cable Insulation

更新时间：2025-12-08

- Application of Dielectric Response in Diagnoses of Time and Frequency Domain on XLPE Cable Insulation
- Vol. 46, Issue 1, Pages: 292-302(2020)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 January 2020，
  
  Published：2020
- 稿件说明：
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ZHAO Aixuan, CHEN Xi, XU Long, et al. Application of Dielectric Response in Diagnoses of Time and Frequency Domain on XLPE Cable Insulation[J]. 2020, 46(1): 292-302.
DOI：

ZHAO Aixuan, CHEN Xi, XU Long, et al. Application of Dielectric Response in Diagnoses of Time and Frequency Domain on XLPE Cable Insulation[J]. 2020, 46(1): 292-302. DOI：

摘要

配电电缆长期运行过程中会在多种应力的作用下逐渐出现劣化现象

进而可能引发故障并严重影响电力系统的安全稳定运行。为诊断电缆劣化情况

以极化/去极化电流为代表的时域介电响应法和以频域介电谱为代表的频域介电响应法被引入并以特征量形式判定其绝缘状态。时域法因其适用范围较广、技术成熟度相对较高的优势

在电缆日常运维中得到初步应用

但在现场实际检测中发现该方法易受外界电磁环境干扰

需采用相应的抗干扰措施以提高测试准确性。频域法在抗干扰性、信息量的丰富性上有较大优势

但受制于过大的电缆电容量与有限的测试设备容量之间的矛盾

目前难以对长电缆在高频下进行绝缘诊断。因此

在后续相关研究中

为提高测试效率

应从介电响应机理出发

结合时域和频域介电响应法各自的优势

利用匹配与转换等手段完善并改进电缆绝缘层的测试频段。

Abstract

Distribution cables gradually deteriorate under several kinds of stresses

which may result in its breakdown and affect the safety and reliability of power system. In order to diagnose the cable deterioration status

dielectric response

the time domain method represented by polarization/depolarization current（PDC） and the frequency domain method represented by frequency domain spectroscopy（FDS） were applied to determine cable insulation status based on the characteristic parameters. According to existing results

the PDC method which is widely used and mature is supposed to be applied in power system maintenance. However

the PDC method is easily interfered by outside electromagnetic environment during on-site tests. The FDS method has the advantages of anti-interference and information richness; However

the FDS method is not able to diagnose long cable in high frequency due to the conflict between excessive power cable capacitance and limited capacity of measuring equipment. As a result

to increase the measurement efficiency

further related research should start from the dielectric response theory and combine with the advantages of time/frequency domain to improve test frequency band by studying the matching and conversion method.

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