Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution

ZHOU Yao; LIU Jiping; ZHAO Xiaolei; FANG Shengchen; HE Jinliang

doi:10.13296/j.1001-1609.hva.2020.08.024

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Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution

更新时间：2025-04-26

- Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution
- High VoltageApparatus Vol. 56, Issue 8, Pages: 155-160(2020)
- 作者机构：
  
  1. 清华大学电机系电力系统及发电设备控制和仿真国家重点实验室
  2. 国网天津电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.08.024
  CLC： TM721.1
- Published：2020
- 稿件说明：
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[1]周垚,刘继平,赵孝磊,房晟辰,何金良.绝缘料电阻率对直流电缆电场分布影响及其调控[J].高压电器,2020,56(08):155-160.

ZHOU Yao, LIU Jiping, ZHAO Xiaolei, et al. Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution[J]. High voltageapparatus, 2020, 56(8): 155-160.
[1]周垚,刘继平,赵孝磊,房晟辰,何金良.绝缘料电阻率对直流电缆电场分布影响及其调控[J].高压电器,2020,56(08):155-160. DOI： 10.13296/j.1001-1609.hva.2020.08.024.

ZHOU Yao, LIU Jiping, ZHAO Xiaolei, et al. Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution[J]. High voltageapparatus, 2020, 56(8): 155-160. DOI： 10.13296/j.1001-1609.hva.2020.08.024.

摘要

直流电缆在运行过程中

由于绝缘层中温度梯度的存在和绝缘料电阻率负温度系数特性会造成绝缘层中电场分布反转

从而增加直流电缆绝缘结构设计的困难。基于100 k V直流电缆结构参数并结合理论推导

采用仿真模拟分析了绝缘层温差、绝缘料电阻率温度系数和电场强度系数对直流电缆电场分布的影响。提出了基于纳米复合技术的直流电缆绝缘料电阻率温度系数调控方法。结果表明

降低绝缘料电阻率温度系数能够有效抑制直流电缆绝缘层中的电场分布反转

并降低直流电缆正常运行时的最大场强;通过纳米复合技术在纳米颗粒与绝缘基体的界面区引入深陷阱能有效抑制高温下绝缘料电阻率的下降

从而降低其电阻率温度系数。

Abstract

During the operation of DC cables

the electric field would be reversed due to the temperature gradient in the insulation layer and the negative temperature coefficient of resistivity of the insulation material

which arises the difficulties in the insulation structure design of DC cables. Based on the structural parameters of 100 kV DC cables and the theoretical analysis

the effect of temperature gradient

the temperature coefficient and electric field coefficient of resistivity on the electric field distribution is analyzed by computational simulation. A method based on nanocomposites technology to control the temperature coefficient of resistivity is proposed. The results show that reducing the temperature coefficient of resistivity of insulation material can effectively suppress the electric field reversal in DC cable insulation layer and reduce the maximum electric field during the operation of DC cables. The introduction of deep traps at the interfaces of nanoparticles and insulation matrix by nanocomposites technology can effectively suppress the decrease of resistivity of the insulation material at high temperature

thereby reducing its temperature coefficientofresistivity.

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