Calculation and Study of Impedance of Conductor-earth Circuits for Overhead Line Systems with Layered Soil Structure

ZHU Jun; WU Guangning; GONG Hongkui; WU Jingwen; ZHANG Longwei; CAO Xiaobin

doi:10.13296/j.1001-1609.hva.2014.02.009

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Calculation and Study of Impedance of Conductor-earth Circuits for Overhead Line Systems with Layered Soil Structure

更新时间：2025-04-26

- Calculation and Study of Impedance of Conductor-earth Circuits for Overhead Line Systems with Layered Soil Structure
- High VoltageApparatus Vol. 50, Issue 2, Pages: 29-34+41(2014)
- 作者机构：
  
  西南交通大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2014.02.009
  CLC： TM751
- Published：2014
- 稿件说明：
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[1]朱军,吴广宁,龚宏奎,吴静文,张龙伟,曹晓斌.大地分层结构条件下架空线路系统导线—地回路阻抗的计算分析[J].高压电器,2014,50(02):29-34+41.

ZHU Jun, WU Guangning, GONG Hongkui, et al. Calculation and Study of Impedance of Conductor-earth Circuits for Overhead Line Systems with Layered Soil Structure[J]. High voltageapparatus, 2014, 50(2): 29-34+41.
[1]朱军,吴广宁,龚宏奎,吴静文,张龙伟,曹晓斌.大地分层结构条件下架空线路系统导线—地回路阻抗的计算分析[J].高压电器,2014,50(02):29-34+41. DOI： 10.13296/j.1001-1609.hva.2014.02.009.

ZHU Jun, WU Guangning, GONG Hongkui, et al. Calculation and Study of Impedance of Conductor-earth Circuits for Overhead Line Systems with Layered Soil Structure[J]. High voltageapparatus, 2014, 50(2): 29-34+41. DOI： 10.13296/j.1001-1609.hva.2014.02.009.

摘要

架空线路系统导线—地回路阻抗是输电线路过电压防护和电磁兼容研究的重要参数。笔者将大地视为水平分层结构

运用复数镜像法

给出了大地水平分层时架空线路系统导线—地回路阻抗的计算方法

验证了该计算方法的正确性;结合中国特高压输电线路实例

计算分析了大地分层结构条件下架空线路系统导线—地回路阻抗的变化规律。结果表明:文中方法克服了Carson公式计算结果频率性能较差的缺点

具有更高的计算准确度;架空线路导线—地回路阻抗随频率和第1层土壤厚度的增加而增大且有饱和趋势

第1层土壤的电阻率对导线—地回路阻抗有明显影响。

Abstract

The impedance of overhead line systems is of particular importance for the study on overvoltage protection and electromagnetic compatibility for transmission lines.In this paper

considering the earth as horizontal layered model

based on the complex image method

the calculation method of impedance of conductor-earth circuits with layered soil structure is given.The correctness of this proposed method is verified.Finally

taking UHV transmission lines as an example

the regularities of impedance of conductor-earth circuits for overhead line systems with layered soil structure are analyzed by calculation results.The results demonstrate that this proposed method overcomes the disadvantage of Carson’s formula which has poor frequency characteristics and its calculation result has a higher accuracy.The impedance of conductor-earth circuits becomes larger with the increase of frequency and thickness of the first-layer soil

but has a tendency to saturation.Meanwhile

the resistivity of the first-layer soil has obvious influence on the impedance of conductor-earth circuits.

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