Influence of Soil Discharge Channel Development Direction on Secondary Cable Impulse Interference

LI Xiaochuan; SIMA Wenxia; YUAN Tao; YANG Ming; LI Jialun; LUO Donghui

doi:10.13334/j.0258-8013.pcsee.240685

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Influence of Soil Discharge Channel Development Direction on Secondary Cable Impulse Interference

更新时间：2026-02-02

- Influence of Soil Discharge Channel Development Direction on Secondary Cable Impulse Interference
- Vol. 45, Issue 16, Pages: 6549-6560(2025)
- 作者机构：
  
  1. 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市沙坪坝区,400044
  2. 国网四川省电力公司电力科学研究院,四川省,成都市,610041
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.240685
  CLC：
- Published：2025
- 稿件说明：
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LI Xiaochuan, SIMA Wenxia, YUAN Tao, et al. Influence of Soil Discharge Channel Development Direction on Secondary Cable Impulse Interference[J]. 2025, 45(16): 6549-6560.
DOI：

LI Xiaochuan, SIMA Wenxia, YUAN Tao, et al. Influence of Soil Discharge Channel Development Direction on Secondary Cable Impulse Interference[J]. 2025, 45(16): 6549-6560. DOI： 10.13334/j.0258-8013.pcsee.240685.

摘要

在垂直接地极冲击散流的情况下，土壤放电通道发展方向的不同对地中电磁场分布的影响不同，进而会在近区双端接地二次电缆中产生不同程度的屏蔽层感应电流和端口干扰电压。为有效预测干扰水平，该文提出一种考虑土壤放电通道方向性影响的二次电缆冲击干扰数值方法。首先，使用A-φ方程有限元法和二次电缆芯皮等效电路模型，分别计算感应电流和干扰电压的频域特性，并基于瞬时电场分布信息对土壤放电通道进行重构，通过时频域交迭计算实现了考虑放电通道影响下的干扰电压准确分析。然后，搭建采用X射线成像技术的通道观测与干扰测量试验平台，测量与仿真结果在波形上相似，最大误差为12.5%，验证了仿真模型具有一定的准确性。最后，仿真结果表明，放电通道平行于二次电缆条件下的端口电压水平可达垂直条件下的1.7倍，说明在接地系统冲击干扰研究中，极端发展方向下的土壤放电通道会引起冲击干扰强度的显著增大。因此，在接地系统电磁兼容性能的分析中有必要考虑放电通道的发展方向。

Abstract

In the case of vertical grounding electrode dissipating impulse current

different development directions of the soil discharge channel have different effects on the distribution of electromagnetic field

resulting in different degrees of shield induced currents and port interference voltages in nearby two-ends grounded secondary cables. In order to effectively predict the interference level

a numerical method for impulse interference is proposed considering the channel development direction. Firstly

using the A-φ equations finite element method and the equivalent circuit model of secondary cable core and sheath

the frequency domain characteristics of the induced current and the interference voltage are calculated. Based on the transient electric field distribution

the soil discharge channel is reconstructed and the accurate analysis of the interference voltage considering the influence of discharge channels is achieved through time-frequency domain alternative calculation. Next

a channel observation and interference measurement experimental platform using X-ray imaging technology is established. The measured results are similar to the simulation results in waveform

with amplitude error within 12.5%

demonstrating a certain degree of simulation accuracy. Finally

simulations reveal that when discharge channels run parallel to secondary cables

the induced port voltage reaches 1.7 times the perpendicular case.This implies that specific directions channel of the soil discharge markedly amplify impulse interference. Thus

accounting for channel orientation is necessary for grounding system EMC analysis.

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