Research on Insulation Characteristics and Optimization Methods of Cable Intermediate Joints Under Switching Overvoltage in Cable-overhead Hybrid Lines

WANG Hanfeng; SUN Haofei; MA Xuheng; TAN Zhen; WANG Chong; LI Shaobin

doi:10.13296/j.1001-1609.hva.2026.10.018

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Research on Insulation Characteristics and Optimization Methods of Cable Intermediate Joints Under Switching Overvoltage in Cable-overhead Hybrid Lines

Research & Analysis | 更新时间：2026-10-14

- Research on Insulation Characteristics and Optimization Methods of Cable Intermediate Joints Under Switching Overvoltage in Cable-overhead Hybrid Lines
- High Voltage Apparatus Vol. 62, Issue 10, Pages: 157-167(2026)
- 作者机构：
  
  国网陕西省电力有限公司西安供电公司，西安 710032
  国网陕西省电力有限公司电力科学研究院，西安 710100
  国网陕西省电力有限公司，西安 710048
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.10.018
  CLC：
- Received：12 May 2026，
  
  Revised：2026-07-16，
  
  Published：16 October 2026
- 稿件说明：
移动端阅览
WANG Hanfeng, SUN Haofei, MA Xuheng, et al. Research on Insulation Characteristics and Optimization Methods of Cable Intermediate Joints Under Switching Overvoltage in Cable-overhead Hybrid Lines[J]. High Voltage Apparatus, 2026, 62(10): 157-167.
DOI：

WANG Hanfeng, SUN Haofei, MA Xuheng, et al. Research on Insulation Characteristics and Optimization Methods of Cable Intermediate Joints Under Switching Overvoltage in Cable-overhead Hybrid Lines[J]. High Voltage Apparatus, 2026, 62(10): 157-167. DOI： 10.13296/j.1001-1609.hva.2026.10.018.

摘要

电力电缆是电能传输和分配的关键媒介，对保障电网安全稳定运行具有重要意义。电缆中间接头是电缆系统故障多发点，为此文中开展了电缆—架空线混联线路过电压下中间接头绝缘特性研究。文中以西北某电缆—架空线混联线路为研究对象，对电缆中间接头电场开展研究，建立了电缆中间接头模型并仿真得到中间接头内部最大场强低于导体屏蔽击穿场强。由电场分布可知中间接头内部应力锥和高压屏蔽层附近电场变化明显，为了减小应力锥和高压屏蔽层周围最大场强，论文采用了蒙特卡罗算法对其材料参数进行了优化，采用单一控制变化，保持其它参数不变，对所研究的单一变量进行优化，将优化值和参数范围内特殊值综合比较得到最优值，优化结果表明：在参数范围内存在最优值，当应力锥相对介电常数取30，倾斜角度取10°时，半导体屏蔽层断口处电场最小；高压屏蔽层相对介电常数取20，屏蔽极半径取10 mm时，高压屏蔽层电场最小。

Abstract

Power cable is the critical medium for electric energy transmission and distribution

playing a vital role in ensuring safe and stable operation of power grid. Cable intermaridate joints are identified as the most vulnerable points prone to failures in cable systems. To address this issue

in this paper a research on the insulation characteristics of intermediate joints under overvoltage conditions in cable-overhead hybrid lines is performed. In this paper

a cable-overhead hybrid line in northwest of China is taken as the research object and the electric field of the cable intermediate joint is studied. The model of the cable intermediate joint is established and the simulation resultsthat the maximum field strength inside the intermediate joint is lower than the conductor shield breakdown field strength are obtained.It can be seen from the electric field distribution that the electric field near the stress cone and the high voltage shielding layer inside the intermediate joint changes obviously. For reducing the maximum field intensity around the stress cone and the high voltage shielding layer the Monte Carlo algorithm is adoptedin the paper to optimize the material parameters. A single control change is adopted

and other parameters remains unchanged to optimize the single variable under study. Furthermore

The optimized values are compared with the special values in the parameter range to get the optimal value. The optimization results show that the optimal values exist in the parameter range.When the relative dielectric constant of the stress cone is 30 and the tilt angle is 10°

the electric field at the fracture of the semiconductor shield layer is the minimum. when the relative dielectric constant of the high voltage shield layer is 20 and the radius of the shield pole is 10 mm

the electric field of the high voltage shield layer is minimum.

关键词

Keywords

references

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