Contribution analysis of neutral current for the substations invaded by stray current from multiple metro lines
Contribution analysis of neutral current for the substations invaded by stray current from multiple metro lines
As a type of convenient and environmentally friendly transportation tool, urban rail transit has been constructed as vital infrastructure in numerous cities over the world. Currently, direct current (DC) traction power supply mode has been applied as mainstream for most of metro lines. However, along with long-term service, the insulation performance between steel track and concrete sleeper deteriorates gradually, possibly causing traction current leaking from rail to ground, forming as ‘stray current’. It possibly invades into transformers through their grounding poles, causing local thermal surge, abnormal vibration or even power quality degradation. At present, only relying on the passively protecting method via installing fixed impedance at the grounding pole can hardly cope with the transiently-varying stray current. Tracing the origin of stray current especially under the scenario of multiple metro lines becomes essential, as the periodicity of traction current from each metro line can be extracted as ‘fingerprint’. A boundary element model of a region with multiple metro lines is launched based on practical geological data, for evaluating the route and distribution of stray current. Based on the Wavelet Transform (WT) method, the correlation is found precisely via comparing periodic feature between the traction current of different metro lines and the neutral current measured synchronously at substations. Moreover, an origin tracing method for clarifying the contributions made by different metro lines on the substation's neutral current is proposed via analyzing the local periodicity of traction current and neutral current, for laying the solid foundation of precise suppression from origin.
Contribution degree calculation, Frequency domain analysis, Neutral current, Stray current
Cao, Ye
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Xiao, Song
6ffa9657-513e-4b86-86a2-e560d3c09c72
Yan, Jingdong
d02a6d81-81a1-4349-a4e2-390ad22809b0
Liu, Chenyang
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Li, Tiangeng
ff8c9bad-e85b-481c-bcbc-29a4a4e6f556
Liu, Xiao
ca28a636-ce25-49c4-bd7b-b5d70d2b7726
Wu, Guangning
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Guo, Yujun
db49d009-9359-4f5d-b676-b49bf966171f
Hou, Jiefu
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He, Yongdong
6b220f58-67fd-483c-8a37-85e3eab30fe6
Zhang, Xueqin
8d218e64-cb62-4a76-b50a-a068f059f450
Erneste, Nibishaka
1d2e3a6e-9431-4372-b19d-3029fe8c16e6
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
19 May 2025
Cao, Ye
23b38e0e-1a14-4983-ac51-9f7b85f3b37f
Xiao, Song
6ffa9657-513e-4b86-86a2-e560d3c09c72
Yan, Jingdong
d02a6d81-81a1-4349-a4e2-390ad22809b0
Liu, Chenyang
5f161610-b8e9-4576-a37e-6fc18278c811
Li, Tiangeng
ff8c9bad-e85b-481c-bcbc-29a4a4e6f556
Liu, Xiao
ca28a636-ce25-49c4-bd7b-b5d70d2b7726
Wu, Guangning
bfc77dce-7b97-40eb-863a-b4041cd3ebcf
Guo, Yujun
db49d009-9359-4f5d-b676-b49bf966171f
Hou, Jiefu
9fd04c57-7c4a-4b9d-934b-ccbf67dfbe66
He, Yongdong
6b220f58-67fd-483c-8a37-85e3eab30fe6
Zhang, Xueqin
8d218e64-cb62-4a76-b50a-a068f059f450
Erneste, Nibishaka
1d2e3a6e-9431-4372-b19d-3029fe8c16e6
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Cao, Ye, Xiao, Song, Yan, Jingdong, Liu, Chenyang, Li, Tiangeng, Liu, Xiao, Wu, Guangning, Guo, Yujun, Hou, Jiefu, He, Yongdong, Zhang, Xueqin, Erneste, Nibishaka and Sykulski, Jan K.
(2025)
Contribution analysis of neutral current for the substations invaded by stray current from multiple metro lines.
International Journal of Electrical Power and Energy Systems, 169, [110773].
(doi:10.1016/j.ijepes.2025.110773).
Abstract
As a type of convenient and environmentally friendly transportation tool, urban rail transit has been constructed as vital infrastructure in numerous cities over the world. Currently, direct current (DC) traction power supply mode has been applied as mainstream for most of metro lines. However, along with long-term service, the insulation performance between steel track and concrete sleeper deteriorates gradually, possibly causing traction current leaking from rail to ground, forming as ‘stray current’. It possibly invades into transformers through their grounding poles, causing local thermal surge, abnormal vibration or even power quality degradation. At present, only relying on the passively protecting method via installing fixed impedance at the grounding pole can hardly cope with the transiently-varying stray current. Tracing the origin of stray current especially under the scenario of multiple metro lines becomes essential, as the periodicity of traction current from each metro line can be extracted as ‘fingerprint’. A boundary element model of a region with multiple metro lines is launched based on practical geological data, for evaluating the route and distribution of stray current. Based on the Wavelet Transform (WT) method, the correlation is found precisely via comparing periodic feature between the traction current of different metro lines and the neutral current measured synchronously at substations. Moreover, an origin tracing method for clarifying the contributions made by different metro lines on the substation's neutral current is proposed via analyzing the local periodicity of traction current and neutral current, for laying the solid foundation of precise suppression from origin.
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Accepted/In Press date: 17 May 2025
e-pub ahead of print date: 19 May 2025
Published date: 19 May 2025
Keywords:
Contribution degree calculation, Frequency domain analysis, Neutral current, Stray current
Identifiers
Local EPrints ID: 502921
URI: http://eprints.soton.ac.uk/id/eprint/502921
ISSN: 0142-0615
PURE UUID: 1298d8c6-3724-4a00-a73f-f3fb89f5d7a0
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Date deposited: 14 Jul 2025 16:31
Last modified: 22 Aug 2025 01:33
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Contributors
Author:
Ye Cao
Author:
Song Xiao
Author:
Jingdong Yan
Author:
Chenyang Liu
Author:
Tiangeng Li
Author:
Xiao Liu
Author:
Guangning Wu
Author:
Yujun Guo
Author:
Jiefu Hou
Author:
Yongdong He
Author:
Xueqin Zhang
Author:
Nibishaka Erneste
Author:
Jan K. Sykulski
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