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Evolution of Grounding Failure-Insulation Failure of 10 kV Cable Joints: Prerequisites of an Explosion in Enclosed Cable Trench
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  • Yifeng Zhao,
  • Gang Liu,
  • Yaodong Guo,
  • Chenglong Huang,
  • Zhaoming He,
  • Ran Hu
Yifeng Zhao
South China University of Technology
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Gang Liu
South China University of Technology
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Yaodong Guo
South China University of Technology
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Chenglong Huang
South China University of Technology
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Zhaoming He
South China University of Technology
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Ran Hu
South China University of Technology

Corresponding Author:[email protected]

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Abstract

An explosion accident in an enclosed cable trench caused by the discharge of 10 kV three-phase cable joints is discussed. Combined with the disassembly analysis, the fault recording data analysis, and the validation of experiment, the evolution of the cable joint fault is deduced and discussed. The results show that the trigger of the cable joint fault is the creepage discharge at the XLPE-SiR insulation interface. This results in the partial breakdown and the grounding failure of three-phase cable joints. Under the long-term floating potential and current thermal effect, the insulations are gradually ablated and decomposed into a large amount of combustible gas. Finally, the accumulated combustible gas is ignited by the arc caused by a three-phase short circuit at the moment of the reclosing operation. The analytical method and conclusions proposed in this paper can provide suggestions and guidance for the analysis of similar fault accidents in the future.
29 Mar 2023Submitted to IET Generation, Transmission & Distribution
30 Mar 2023Submission Checks Completed
30 Mar 2023Assigned to Editor
13 Apr 2023Reviewer(s) Assigned
12 May 2023Review(s) Completed, Editorial Evaluation Pending
13 May 2023Editorial Decision: Revise Minor
16 May 20231st Revision Received
18 May 2023Submission Checks Completed
18 May 2023Assigned to Editor
21 May 2023Reviewer(s) Assigned
05 Jun 2023Review(s) Completed, Editorial Evaluation Pending
05 Jun 2023Editorial Decision: Accept