Measurement Method and Calculation Error of Rail-to-earth Resistance in Urban Rail

LIU Wei; LI Fuqiang; TANG Jingkun; HE Liang; SANG Guoyang; LI Kunpeng

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Measurement Method and Calculation Error of Rail-to-earth Resistance in Urban Rail

更新时间：2025-12-08

- Measurement Method and Calculation Error of Rail-to-earth Resistance in Urban Rail
- Vol. 46, Issue 8, Pages: 2856-2863(2020)
- 作者机构：
  
  1. 西南交通大学电气工程学院
  2. 四川轻化工大学自动化与信息工程学院
  3. 广州地铁设计研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2020，
  
  Published：2020
- 稿件说明：
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LIU Wei, LI Fuqiang, TANG Jingkun, et al. Measurement Method and Calculation Error of Rail-to-earth Resistance in Urban Rail[J]. 2020, 46(8): 2856-2863.
DOI：

LIU Wei, LI Fuqiang, TANG Jingkun, et al. Measurement Method and Calculation Error of Rail-to-earth Resistance in Urban Rail[J]. 2020, 46(8): 2856-2863. DOI：

摘要

走行轨过渡电阻的测量对杂散电流评估有着重要的意义。实际运营线路、过渡电阻的测量受远端钢轨电位限制器接地等情况干扰。通过建立走行轨-排流网两层模型

求解走行轨电位和电流在线路首末端双端接地、不接地和单端接地3种情形下的分布

分析过渡电阻测量误差。走行轨平均电位测量误差随着测量区间的增大而增大

泄漏电流的测量误差随着测量区间的增大而减小。当线路两端接地时

过渡电阻测量误差最大可达到1.20■·km。建议过渡电阻测量区间长度控制在1～4 km范围内。当走行轨平均电位计算考虑其近似直线分布时

平均电位误差均小于采用算术平均值计算

可以减小过渡电阻测量误差。

Abstract

The measurement of the rail-to-earth resistance has important significance for the assessment of stray current.In an actual operating line

the measurement of the rail-to-earth resistance is interfered by the over-voltage protection device and so on.By establishing a two-layer model of the running rail-stray current collect mat

the distribution of the rail potential and current at the double-end grounding

ungrounded and single-ended grounding at the end of the line is solved

and the measurement error of the rail-to-earth resistance is analyzed.The average voltage measurement error of the running rail increases as the measurement interval increases.The measurement error of the leakage current decreases as the measurement interval increases.When the two ends of the running rail are grounded

the measurement error of the rail-to-earth resistance can reach 1.20■·km.It is recommended that the length of the rail-to-earth resistance measurement interval should be controlled within the range of 1～4 km.When the average potential calculation of the rail considers its approximate linear distribution

the average rail potential error is less than the arithmetic mean value

and the measurement error of the rail-to-earth resistance can be reduced.

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