Study on a 110 kV combined prefabricated joint fault caused by premature failure of grounding grid

Huang, Jian; Ye, Zhechi; Zhang, Gengbin; Bao, Shuzhen; Wang, Pengyu; Liu, Gang

doi:10.1016/j.engfailanal.2022.106701

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…A grounding grid is an important device used in substations for work grounding, lightning grounding, and protective grounding, to ensure the safety of people, equipment, and systems [1][2][3]. In the case of a lightning strike or power system failure that releases a large amount of current to the ground, the grounding grid plays a role in quickly dissipating the current and reducing the contact voltage and step voltage [4,5].…”

Section: Introductionmentioning

confidence: 99%

Review on Soil Corrosion and Protection of Grounding Grids

Zhao,

Meng,

Ren

et al. 2024

Materials

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The corrosion of grounding grid materials in soil is a prominent factor in power and electrical equipment failure. This paper aims to delve into the corrosion characteristics of grounding grid materials and the corresponding methods of safeguarding against this phenomenon. Firstly, the influencing factors of the soil environment on the corrosion of the grounding grid are introduced, including soil physicochemical properties, microorganisms, and stray currents. Then, the corrosion behavior and durability of common grounding grid materials such as copper, carbon steel, and galvanized steel are discussed in detail and compared comprehensively. In addition, commonly used protective measures in China and outside China, including anti-corrosion coatings, electrochemical protection, and other technologies are introduced. Finally, it summarizes the current research progress and potential future directions of this field of study.

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Section: Introductionmentioning

confidence: 99%

Review on Soil Corrosion and Protection of Grounding Grids

Zhao,

Meng,

Ren

et al. 2024

Materials

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show abstract

“…However, the discharge behavior of actual faulty cable joints is more complicated. In previous studies in engineering failure analysis of the cable joint, Huang et al [14] analyzed a breakdown fault case of 110 kV combined prefabricated cable joint. It is found that the floating potential caused by grounding failure is responsible for the epoxy insulator breakdown.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Grounding Failure-Insulation Failure of 10 kV Cable Joints: Prerequisites of an Explosion in Enclosed Cable Trench

Zhao

Liu

Guo

et al. 2023

Preprint

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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.

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“…However, the discharge behaviour of actual faulty cable joints is more complicated. In previous studies in engineering failure analysis of the cable joint, Huang et al [14] analyzed a breakdown fault case of 110 kV combined prefabricated cable joint. It is found that the floating potential caused by grounding failure is responsible for the epoxy insulator breakdown.…”

Section: Introductionmentioning

confidence: 99%

Evolution of grounding failure‐insulation failure of 10 kV cable joints: Prerequisites of an explosion in enclosed cable trench

Zhao

Liu

Guo

et al. 2023

IET Generation Trans & Dist

Self Cite

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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 cross‐linked polyethylene–silicon rubber 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 to prevent analogous distribution network cable joint fault accidents.

show abstract

Study on a 110 kV combined prefabricated joint fault caused by premature failure of grounding grid

Cited by 8 publications

References 18 publications

Review on Soil Corrosion and Protection of Grounding Grids

Review on Soil Corrosion and Protection of Grounding Grids

Evolution of Grounding Failure-Insulation Failure of 10 kV Cable Joints: Prerequisites of an Explosion in Enclosed Cable Trench

Evolution of grounding failure‐insulation failure of 10 kV cable joints: Prerequisites of an explosion in enclosed cable trench

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