Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid
Abstract In urban power networks, a common practice is to bond numerous high‐voltage cable circuits to a single grounding grid located in underground tunnels, primarily for reasons of installation convenience. In these situations, excessively high levels of sheath currents were often detected during...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2025-06-01
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| Series: | High Voltage |
| Online Access: | https://doi.org/10.1049/hve2.12503 |
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| author | Gen Li Wenjun Zhou Chengke Zhou Hang Wang Chen Pan |
| author_facet | Gen Li Wenjun Zhou Chengke Zhou Hang Wang Chen Pan |
| author_sort | Gen Li |
| collection | DOAJ |
| description | Abstract In urban power networks, a common practice is to bond numerous high‐voltage cable circuits to a single grounding grid located in underground tunnels, primarily for reasons of installation convenience. In these situations, excessively high levels of sheath currents were often detected during routine inspections, but no electrical faults were found to be responsible. Previous publications ignored the currents flowing through the shared grounding points into the closed sheath loops of different circuits. In this paper, a mathematical model is established for the current circulating among sheath loops of different circuits, and the factors influencing the circulating current were analysed. The abnormal excessive sheath current is demonstrated to be an increase in the circulating current due to the combined effect of electromagnetic coupling and the shared grounding grid. The circulating current depends on the induced voltages which, in turn, depends on the cable layouts and load currents. The effects of these factors are evaluated in various scenarios. The increase of the circulating current is verified in a field case where four electrically healthy cable circuits sharing the same grounding points were found to have abnormal excessive sheath currents. |
| format | Article |
| id | doaj-art-6b4904ecca544d3ba34c0e212b60bcb4 |
| institution | DOAJ |
| issn | 2397-7264 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | High Voltage |
| spelling | doaj-art-6b4904ecca544d3ba34c0e212b60bcb42025-08-20T03:14:54ZengWileyHigh Voltage2397-72642025-06-0110368969810.1049/hve2.12503Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding gridGen Li0Wenjun Zhou1Chengke Zhou2Hang Wang3Chen Pan4School of Electrical Engineering and Automation Wuhan University Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaHubei Engineering Research Center for Condition Monitoring of New Energy and Power Grid Equipment Hubei University of Technology Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaAbstract In urban power networks, a common practice is to bond numerous high‐voltage cable circuits to a single grounding grid located in underground tunnels, primarily for reasons of installation convenience. In these situations, excessively high levels of sheath currents were often detected during routine inspections, but no electrical faults were found to be responsible. Previous publications ignored the currents flowing through the shared grounding points into the closed sheath loops of different circuits. In this paper, a mathematical model is established for the current circulating among sheath loops of different circuits, and the factors influencing the circulating current were analysed. The abnormal excessive sheath current is demonstrated to be an increase in the circulating current due to the combined effect of electromagnetic coupling and the shared grounding grid. The circulating current depends on the induced voltages which, in turn, depends on the cable layouts and load currents. The effects of these factors are evaluated in various scenarios. The increase of the circulating current is verified in a field case where four electrically healthy cable circuits sharing the same grounding points were found to have abnormal excessive sheath currents.https://doi.org/10.1049/hve2.12503 |
| spellingShingle | Gen Li Wenjun Zhou Chengke Zhou Hang Wang Chen Pan Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid High Voltage |
| title | Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| title_full | Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| title_fullStr | Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| title_full_unstemmed | Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| title_short | Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| title_sort | analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid |
| url | https://doi.org/10.1049/hve2.12503 |
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