2025年4月8日 周二
首页 > 过刊浏览>2024年第卷第1期 >134-143. DOI:10.19781/j.issn.1673-9140.2024.01.013
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地铁杂散电流对变压器直流偏磁的影响分析
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作者:
作者单位:

(1.国网湖南省电力有限公司超高压变电公司，湖南 长沙 410004;2.变电智能运检国网湖南省电力有限公司实验室，湖南 长沙 410004;3.长沙理工大学电气与信息工程学院，湖南 长沙 410114)

通讯作者:

倪砚茹（1993—），女，博士研究生，主要从事电力系统保护与控制、城市轨道牵引供电系统等研究；E?mail：yanruni@qq.com

中图分类号:

TM401+.1

基金项目:

国网湖南省电力有限公司科技项目（164100003187）


Analysis of the influence of metro stray current on transformer DC bias
Author:
Affiliation:

(1. State Grid Hunan Extra High Voltage Substation Company，Changsha 410004，China;2. Substation Intelligent Operation and Inspection Laboratory of State Grid Hunan Electric Power Co., Ltd.，Changsha 410004，China;3. School of Electrical & Information Engineering，Changsha University of Science & Technology，Changsha 410114，China)

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    摘要:

    地铁运行过程中泄漏的杂散电流引起地电位波动变化，易导致附近接地变压器出现直流偏磁现象。为解决此类问题，首先，建立了地铁运行等值电阻网络模型，实现杂散电流实时数值计算；然后，进一步推导了杂散电流场位方程，实现地铁机车运行时附近大地电位空间分布的动态模拟；最后，基于杂散电流引起的大地电位分布结果与交流电网的等效直流电阻模型，实现接地变压器偏磁直流和励磁电流的数值计算，建立中性点直流量和波形畸变率偏移度评判指标，可有效评估变压器直流偏磁程度。仿真结果表明，机车运行工况及机车间距对变压器直流偏磁影响明显，制定合理的地铁运行策略可有效削弱附近变电站直流偏磁干扰。

    Abstract:

    The metro stray current leaked during the train operation causes the surface potential fluctuation, resulting nearby transformer DC bias. Firstly, a equivalent resistance network model was established to realize actual time numerical calculation of stray current. Then, the stray current field equation was further derived, and the dynamic simulation of the geopotential potential distribution was realized during the train operation. Based on the potential distribution caused by stray current and the equivalent DC resistance model of AC power grid, the numerical calculation of DC bias current and excitation current of grounding transformer was realized. The index of neutral point current and waveform distortion rate is established, so the effective evaluation of the transformer DC bias could be realized. The simulation results show that the operating conditions and distance between the metro train have obvious effects on the transformer DC bias, so formulating a reasonable metro operation strategy could effectively restrain transformer DC bias interference for nearby substations.

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周展帆,严 宇,于艺盛,等.地铁杂散电流对变压器直流偏磁的影响分析[J].电力科学与技术学报,2024,(1):134-143.
ZHOU Zhanfan, YAN Yu, YU Yisheng, et al. Analysis of the influence of metro stray current on transformer DC bias[J]. Journal of Electric Power Science and Technology,2024,(1):134-143.

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