Research on Grounding Resistance Testing Method of High-voltage Cable Tunnel Grounding Network

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

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Research on Grounding Resistance Testing Method of High-voltage Cable Tunnel Grounding Network

更新时间：2025-10-15

- Research on Grounding Resistance Testing Method of High-voltage Cable Tunnel Grounding Network
- High Voltage Apparatus Pages: 1-18(2025)
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- Published Online：15 October 2025，
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任志刚,刘博,张轶炫等.高压电缆隧道接地网接地阻抗测试方法研究[J].高压电器,

REN Zhigang,LIU Bo,ZHANG Yixuan,et al.Research on Grounding Resistance Testing Method of High-voltage Cable Tunnel Grounding Network[J].High Voltage Apparatus,
任志刚,刘博,张轶炫等.高压电缆隧道接地网接地阻抗测试方法研究[J].高压电器, DOI：.

REN Zhigang,LIU Bo,ZHANG Yixuan,et al.Research on Grounding Resistance Testing Method of High-voltage Cable Tunnel Grounding Network[J].High Voltage Apparatus, DOI：.

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 cable tunnel grounding network has an ultra-slender structure. Using three- electrodes method needs Large number of cables. There is no mature method for long-distance cable tunnel grounding resistance testing. Therefore，this paper establishes a typical cable tunnel grounding network model，studies the ground potential distribution and proposes a test method for grounding resistance of cable tunnel grounding network based on the principle of three- electrodes method. At the same time，this paper put forward different test methods of the long and short distance tunnel grounding network based on the tunnel grounding network dispersion flow characteristics. When a short circuit occurs in the middle of a long distance tunnel，the substation at both ends of the tunnel dissipates little current. Thus the substation grounding networks at both ends can be ignored when testing. However，there is a short-circuit shunt in the substation grounding network. This paper calculates the shunt coefficient to correct the grounding impedance. For a short distance tunnel，the substation grounding networks at both ends need to be taken into account. The grounding impedance of the long and short distance cable tunnel sections are tested in the field respectively using the proposed method. The error is within a reasonable range when compared with the simulation results，which verifies the feasibility of the method.

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references

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