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Measurement and Analysis of the Distribution Ratio of Traction Return Current in Guangzhou 25 kV AC Standard Subway
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Guoyang SANG1, Li LIU2, Shangsong YA1, Lingxiao WANG2, Xia CHEN1, Xiaobin CAO2
Urban Rapid Rail Transit | 2025, 38(2) : 61 - 67
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Urban Rapid Rail Transit | 2025, 38(2): 61-67
• Academic Discussion •
Measurement and Analysis of the Distribution Ratio of Traction Return Current in Guangzhou 25 kV AC Standard Subway
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Guoyang SANG1, Li LIU2, Shangsong YA1, Lingxiao WANG2, Xia CHEN1, Xiaobin CAO2
Affiliations
  • 1 Guangzhou Metro Design and Research Institute Co., Ltd. Guangzhou 510010
  • 2 School of Electrical Engineering Southwest Jiaotong University Chengdu 611756
Published: 2025-04-01 doi: 10.3969/j.issn.1672-6073.2025.02.009
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Traction current return system is an important part of traction power supply system. System failures can damage primary and secondary equipment and potentially disrupt train operations. At present, there is limited research on realtime measurement of traction return current distribution for 25 kV AC power supply system subway. This study presents a synchronous testing methodology for measuring current in individual return cables to study return current distribution patterns and verify limitations in SCADA system monitoring. Based on return paths, the current is divided into three groups: station return, parking lot return, and ground return. The study analyzes the proportion and variation pattern of return current in different paths and compared findings with SCADA return current data. Results indicated that despite significant temporal fluctuations in return current magnitude, the distribution ratio remains stable most of the time, with only occasional variations. The average distribution ratios across different time periods vary by less than 1%. However, the SCADA system fails to accurately reflect return current changes. This research establishes return current distribution ratios through empirical testing, providing reference values for similar substations and directions for improving SCADA system monitoring capabilities.

subway  /  traction return current  /  ground return  /  current monitoring  /  return current distribution ratio
Guoyang SANG, Li LIU, Shangsong YA, Lingxiao WANG, Xia CHEN, Xiaobin CAO. Measurement and Analysis of the Distribution Ratio of Traction Return Current in Guangzhou 25 kV AC Standard Subway[J]. Urban Rapid Rail Transit, 2025 , 38 (2) : 61 -67 . DOI: 10.3969/j.issn.1672-6073.2025.02.009
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Article Info
doi: 10.3969/j.issn.1672-6073.2025.02.009
  • Receive Date：2024-04-09
  • Online Date：2025-07-09
  • Published：2025-04-01
Article Data
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History
  • Received：2024-04-09
  • Revised：2024-06-28
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Affiliations
    1 Guangzhou Metro Design and Research Institute Co., Ltd. Guangzhou 510010
    2 School of Electrical Engineering Southwest Jiaotong University Chengdu 611756
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光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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