Dynamic Charges Behavior and High-field Conduction Characteristics of XLPE Insulation Based on Current Integrated Charge Technique

NIE Yongjie; WANG Weiwang; LI Shengtao; ZHAO Xianping; XIANG Enxin; WANG Ke; Takada Tatsuo

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Dynamic Charges Behavior and High-field Conduction Characteristics of XLPE Insulation Based on Current Integrated Charge Technique

更新时间：2025-12-08

- Dynamic Charges Behavior and High-field Conduction Characteristics of XLPE Insulation Based on Current Integrated Charge Technique
- Vol. 47, Issue 8, Pages: 2971-2980(2021)
- 作者机构：
  
  1. 云南电网有限责任公司电力科学研究院
  2. 西安交通大学电力设备电气绝缘国家重点实验室
  3. 东京都市大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2021，
  
  Published：2021
- 稿件说明：
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NIE Yongjie, WANG Weiwang, LI Shengtao, et al. Dynamic Charges Behavior and High-field Conduction Characteristics of XLPE Insulation Based on Current Integrated Charge Technique[J]. 2021, 47(8): 2971-2980.
DOI：

NIE Yongjie, WANG Weiwang, LI Shengtao, et al. Dynamic Charges Behavior and High-field Conduction Characteristics of XLPE Insulation Based on Current Integrated Charge Technique[J]. 2021, 47(8): 2971-2980. DOI：

摘要

为研究交联聚乙烯(XLPE)电缆绝缘在不同电场下的动态电荷行为以及高场电导特性

介绍了基于电流积分电荷新技术的测试原理和系统搭建方法。测试结果表明

不同场强下的电荷动态(q(t))变化可以揭示XLPE绝缘介质的瞬时充电电流、吸收电流和传导电流特性。根据瞬时充电电荷q0计算获得XLPE绝缘介质的静态相对介电常数为2.2;通过对动态电荷变化微分可获得绝缘高场电导特性。高场电导结果表明XLPE欧姆区电导率为3.79×10–15S/m

高场电导曲线评估的XLPE电荷注入阈值场强约为10k V/mm。这些结果都与文献报道一致

验证了电流积分电荷测试的准确性和有效性。此外

对比了采用PEA的XLPE空间电荷分布测试结果

发现其电荷随电场增加与q(t)方法测试结果趋势一致

且电流积分电荷技术具有测试灵敏度高和测试温度范围宽的优势。最后

采用电流积分电荷技术测试分析了不同水树枝老化整体电缆(6.6 kV)绝缘的电荷积聚特性

通过电荷积聚量变化可评估整体电缆绝缘老化状态。

Abstract

Based on the new diagnosed technology of current integral charge（DCIC）

this paper studies the dynamic charges behavior and high-field conduction characteristics of XLPE insulation under different electric fields through the test principle and system construction. The results show that the dynamic charges variation q（t） under different electric fields reveals the characteristics of instantaneous charging current

absorption current

and conduction current of XLPE. According to the results of instantaneous charge q0

the static relative dielectric constant εr of XLPE insulation medium can be calculated as 2.2. The current is obtained by differentiating the dynamic charges. The high field conduction results show that the conductivity of the Ohmic region of XLPE is 3.79×10–15 S/m. According to the high field conduction

the charge injection threshold of XLPE is estimated to be about 10 kV/mm. These studies are consistent with the results reported in the literature and verify the accuracy and effectiveness of the DCIC-q（t）. In addition

the space charge distribution results of XLPE by PEA present the same trend with the q（t） for charge increase with the electric field. The DCIC-q（t） technique has the advantages of high sensitivity and wide range. Finally

the charge accumulation characteristics of the insulation of different water-tree aged whole cables（6.6 kV） are analyzed by using the DCIC-q（t） method. Aging of the whole cable insulation can be evaluated by the change of the charge accumulation.

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