The Effects of Temperature Gradient and Electrical Tree Defects on The Electric Field Distribution Characteristics of HVDC Cable Joints

WANG Zhuo; LI Huan; SHI Yingxin; GAO Jianwei; CHEN Gege

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The Effects of Temperature Gradient and Electrical Tree Defects on The Electric Field Distribution Characteristics of HVDC Cable Joints

更新时间：2025-06-27

- The Effects of Temperature Gradient and Electrical Tree Defects on The Electric Field Distribution Characteristics of HVDC Cable Joints
- Moren Journal (2025)
- 作者机构：
  
  1.陕西理工大学电气工程学院,陕西省汉中市,中国
  2.陕西省电力设计院,陕西省西安市,中国
- 作者简介：
- 基金信息：
  
  Shaanxi Provincial Department of Science and Technology natural science key projects(2023-JC-ZD-34);Special Research Program of Shaanxi Provincial Department of Education(22JK0322);The Shaanxi University of Technology Graduate Innovation Fund(SLGYCX2403)
- DOI：
  CLC：
- Received：25 October 2024，
  
  Revised：28 November 2024，
  
  Accepted：11 December 2024，
- 稿件说明：
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WANG Zhuo, LI Huan, SHI Yingxin, et al. The Effects of Temperature Gradient and Electrical Tree Defects on The Electric Field Distribution Characteristics of HVDC Cable Joints[J/OL]. Moren journal, 2025.
DOI：

WANG Zhuo, LI Huan, SHI Yingxin, et al. The Effects of Temperature Gradient and Electrical Tree Defects on The Electric Field Distribution Characteristics of HVDC Cable Joints[J/OL]. Moren journal, 2025. DOI：

摘要

电缆中间接头结构复杂易出现故障，一旦出现气隙、杂质等微观缺陷，就可能引发电场畸变进而生成电树枝甚至增加击穿风险。并且电缆接头由于空间电荷积聚及温度梯度引发的场强翻转等问题可能引起绝缘击穿。将±200 kV高压直流电缆中间接头设为研究对象，通过有限元仿真软件研究不同温度梯度（Δ

）下生长及滞长阶段电树枝缺陷对电缆接头稳态、暂态电场分布特性的影响。结果表明，当Δ

达到一定值时，SIR和XLPE绝缘内会发生场强翻转；稳态电场下，生长期内电树枝引发的局部电场最大值远高于无缺陷时场强；滞长期内电树枝引发的局部电场最大值略高于无缺陷时场强。暂态电场下，当Δ

≥20℃时，生长阶段电树枝的最大电场强度随极性反转时间的增加而逐渐减小，当Δ

＜20℃时最大场强则会先减小后增大；滞长阶段电树枝的最大电场强度随极性反转时间的增加出现先减小后增大现象，且在120 s时出现最大电场强度。

Abstract

The structure of the cable intermediate joint is complex and prone to failure. Once micro-defects such as air gap and impurities occur

it may cause electric field distortion and generate electrical trees or even increase the risk of breakdown. And cable joints may cause insulation breakdown due to problems such as space charge accumulation and field strength reversal caused by temperature gradient. Taking the ± 200 kV HVDC cable intermediate joint as the research object

the influence of electrical tree defects in the growth and stagnation stages under different temperature gradients (Δ

) on the steady-state and transient electric field distribution characteristics of cable joints was studied by finite element simulation software. The results show that when Δ

reaches a certain value

field strength reversal occurs in SIR and XLPE insulation. Under the steady-state electric field

the maximum value of the local electric field caused by the electrical tree during the growth period is much higher than that without defects. The maximum value of the local electric field caused by the electrical tree in the hysteresi

s period is slightly higher than the field strength when there is no defect. Under the transient electric field

when Δ

≥20℃

the maximum electric field intensity of the electrical tree in the growth stage gradually decreases with the increase of the polarity reversal time. When Δ

20℃

the maximum electric field intensity decreases first and then increases. With the increase of polarity reversal time

the maximum electric field intensity of the electrical tree in the stagnation stage decreases first and then increases

and the maximum electric field intensity appears at 120 s.

关键词

Keywords

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