Research on Testing Method for Grounding Impedance of Grounding Grid in High-voltage Cable Tunnel

REN Zhigang; LIU Bo; ZHANG Yixuan; LIU Yin; LI Huachun; GUO Wei; LU Hailiang

doi:10.13296/j.1001-1609.hva.2026.01.026

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Research on Testing Method for Grounding Impedance of Grounding Grid in High-voltage Cable Tunnel

Research & Analysis | 更新时间：2026-04-13

- Research on Testing Method for Grounding Impedance of Grounding Grid in High-voltage Cable Tunnel
- High Voltage Apparatus Vol. 62, Issue 1, Pages: 207-215(2026)
- 作者机构：
  
  国网北京电力科学研究院，北京　100071
  武汉大学电气与自动化学院，武汉　430072
  国网北京市电力公司，北京　100031
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.01.026
  CLC：
- Received：20 July 2025，
  
  Revised：2025-10-13，
  
  Published：16 January 2026
- 稿件说明：
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REN Zhigang, LIU Bo, ZHANG Yixuan, et al. Research on Testing Method for Grounding Impedance of Grounding Grid in High-voltage Cable Tunnel[J]. High Voltage Apparatus, 2026, 62(1): 207-215.
DOI：

REN Zhigang, LIU Bo, ZHANG Yixuan, et al. Research on Testing Method for Grounding Impedance of Grounding Grid in High-voltage Cable Tunnel[J]. High Voltage Apparatus, 2026, 62(1): 207-215. DOI： 10.13296/j.1001-1609.hva.2026.01.026.

摘要

电缆隧道接地网具有超细长结构，利用远离法测试布线长度巨大，目前没有针对长距离电缆隧道接地阻抗测试的成熟方法。因此文中建立典型电缆隧道接地网模型，研究了电缆隧道超细长型接地网地电位分布，从三极法的原理出发提出了一种电缆隧道接地网接地阻抗的现场测试方法。同时从隧道接地网散流特性出发，提出了针对长、短距离隧道接地网的不同测试方法。长距离隧道中间位置发生短路时隧道两端变电站散流很少，测试时可以忽略两端变电站接地网。但变电站接地网存在短路分流，文中计算了分流系数，对接地阻抗进行了修正。短距离隧道测试需要考虑两端变电站接地网。应用提出的方法，对长、短距离电缆隧道段接地阻抗分别进行现场测试，与仿真结果比较，验证了方法的可行性。

Abstract

The grounding grid of cable tunnel has an extremely long and slender structure. The grounding grid of cable tunnel has an extremely long and slender structure. Furthermore

the remote method for testing such grid requires extensive wiring over long distance. As a result

there is currently no established methology for accurately measuring the grounding impedance of long distance cable tunnels. Therefore

in this paper a typical cable tunnel grounding grid model is set up

the ground potential distribution of extremely long and slender grounding grid of cable tunnel is studied and

based on the principle of three-electrodes method

a test method for grounding impedance of grounding grid of cable tunnel is proposed. At the same time

the different test methods of the grounding grid of long and short distance tunnel is proposed based on the dispersion flow characteristics of the grounding grid of tunnel. In case of a short circuit in the middle position of a long distance tunnel

the dispersion flow of substations on both ends of the tunnel is less and

in case of test

the grounding grids of substation on both ends can be neglected. However

a short-circuit shunt is existed in the grounding grid of substation. In this paper the shunt coefficient is calculated and the grounding impedance is corrected. For the test of a short distance tunnel

the grounding grid of substations on both ends of substations shall be considered. The proposed method shall be used to perform site test of the grounding impedance of long and short distance cable tunels respsectively

and the feasibility of the mthod is verified through comparison with the the simulation result.

关键词

Keywords

references

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