Test and Analysis on Influence of Stray Current of Urban Rail Transit on DC Bias of 500 kV Transformer

CHEN Lu; WU Tianyi; SU Lei; HUANG Hua; LI Xiaohua; LI Juncong

doi:10.13296/j.1001-1609.hva.2024.10.015

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Test and Analysis on Influence of Stray Current of Urban Rail Transit on DC Bias of 500 kV Transformer

Research & Analysis | 更新时间：2025-04-26

- Test and Analysis on Influence of Stray Current of Urban Rail Transit on DC Bias of 500 kV Transformer
- High Voltage Apparatus Vol. 60, Issue 10, Pages: 147-155(2024)
- 作者机构：
  
  1.国网上海市电力公司，上海　 200122
  2.上海电力大学电气工程学院，上海　 200090
- 作者简介：
- 基金信息：
  
  Science and Technology Project of State Grid Co., Ltd.(520940200013)
- DOI：10.13296/j.1001-1609.hva.2024.10.015
  CLC：
- Received：23 March 2024，
  
  Revised：03 May 2024，
  
  Published：16 October 2024
- 稿件说明：
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CHEN Lu, WU Tianyi, SU Lei, et al. Test and Analysis on Influence of Stray Current of Urban Rail Transit on DC Bias of 500 kV Transformer[J]. High voltage apparatus, 2024, 60(10): 147-155.
DOI：

CHEN Lu, WU Tianyi, SU Lei, et al. Test and Analysis on Influence of Stray Current of Urban Rail Transit on DC Bias of 500 kV Transformer[J]. High voltage apparatus, 2024, 60(10): 147-155. DOI： 10.13296/j.1001-1609.hva.2024.10.015.

摘要

城市轨道交通运行会引起变压器直流偏磁问题，严重威胁电网的安全稳定运行。为研究轨道交通运行对变压器直流偏磁的影响，文中对上海市轨道交通沿线的某500 kV变压器，采用多物理量同步测量方法测试了轨道交通正常运行、高峰运行和停运后的变压器中性点直流、振动和噪声特性，并与2010年地铁刚投运时振动噪声数据进行比较。分析测试结果发现变压器中性点直流、振动噪声特性与轨道交通负荷功率呈现正相关的变化规律。证明了轨道交通运行引起的杂散电流会导致变压器长期直流偏磁运行，为解决类似问题提供了参考性意见。

Abstract

The operation of urban rail transit will cause DC bias of transformer

which will seriously threaten the safe and stable operation of the power grid. In order to study the influence of operation of rail transit on the DC bias of transformer

the multi-physical measurement method is adopted of certain 500 kV transformer along the line of Shanghai rial transit to test the neutral point DC

vibration

and noise characteristics of the transformer during normal operation

peak operation and shutdown of the transformer

and compare with the vibration noise data of the subway in operation in 2010. It is found by the analysis and test result that the neutral point DC

vibrationand noise characteristics of the transformer as well as the load power of the rail transit show a positive correlation. It proves that the stray current caused by rail transit operation will cause the transformer to operate with DC bias for a long time

which provides guidance for the operation and maintenance of the transformer.

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