High Precision Calculation Method for Loop Resistance of Metallic Sheath in Cross-linked Grounding High-voltage Cables

CHEN Tengbiao; LIN Qingjie; LI Dong; ZHAO Weili; LEI Da; HU Liguang; TANG Zhiguo

doi:10.13296/j.1001-1609.hva.2026.04.020

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High Precision Calculation Method for Loop Resistance of Metallic Sheath in Cross-linked Grounding High-voltage Cables

Research & Analysis | 更新时间：2026-04-08

- High Precision Calculation Method for Loop Resistance of Metallic Sheath in Cross-linked Grounding High-voltage Cables
- High Voltage Apparatus Vol. 62, Issue 4, Pages: 175-182(2026)
- 作者机构：
  
  深圳供电局有限公司，广东深圳 518000
  华北电力大学高电压与电磁兼容北京市重点实验室，北京 102206
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.04.020
  CLC：
- Received：15 September 2025，
  
  Revised：2025-11-27，
  
  Published：16 April 2026
- 稿件说明：
移动端阅览
CHEN Tengbiao, LIN Qingjie, LI Dong, et al. High Precision Calculation Method for Loop Resistance of Metallic Sheath in Cross-linked Grounding High-voltage Cables[J]. High Voltage Apparatus, 2026, 62(4): 175-182.
DOI：

CHEN Tengbiao, LIN Qingjie, LI Dong, et al. High Precision Calculation Method for Loop Resistance of Metallic Sheath in Cross-linked Grounding High-voltage Cables[J]. High Voltage Apparatus, 2026, 62(4): 175-182. DOI： 10.13296/j.1001-1609.hva.2026.04.020.

摘要

高压电力电缆是电能传输的重要设备，金属护层系统是保障高压电缆正常运行的重要组成部分。交叉互联接地高压电缆的三相金属护层之间存在电磁耦合，为护层接地回路电阻的高精度求解带来了困难。为此，文中针对交叉互联接地的高压电缆，提出了采用异频信号激励的金属护层回路电阻带电检测方法，研究了交叉互联接地方式下电缆金属护层接地回路的等效电路模型，分析了三相金属护层各部分回路间的电磁耦合关系；采用对称分量法建立了回路的去耦等效电路模型，消除了耦合电感对回路电阻求解带来的影响，保证了带电条件下检测电缆金属护层接地回路电阻的求解精度，并通过仿真验证了模型的正确性与有效性。

Abstract

High voltage power cable is an important equipment for power transmission

and metal sheath system is an important part to ensure normal operation of high voltage power cables.The electromagnetic coupling is existed bwteen the three-phase metal sheaths of high-voltage cable

which makes it difficult to solve the resistance of the grounding circuit with high precision. Therefore

for high-voltage cables with cross-linked grounding in this paper

a method to detect the resistance of metal sheath circuit with hetero frequency signal excitation is proposed

the equivalent circuit model of cable metal sheath grounding circuit under cross-linked grounding mode is studied and the electromagnetic coupling relationship between each part of the three-phase metal sheath circuit is analyzed.The symmetric component method is used to set up the decoupling equivalent circuit model of the loop

which eliminates the influence of the coupling inductance on the loop resistance solution

ensures the solving precision of the loop resistance of the metal sheath grounding circuit for live detection of power cable.Moreover

both correctness and effectiveness of the model are verified by simulation.

关键词

Keywords

references

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