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