基于电-热场耦合的35kV电缆中间接头气隙缺陷仿真分析

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Abstract In order to study the performance of cable joints with different sizes of air wedge gaps, the refined model of 35kV cable joint is designed to calculate the electric field and temperature distribution of cable joint under single-phase earthing fault by the finite element method. The results show that the electric field in air gap of cable joint is concentrated which leads to the deterioration of insulation layer. As the length of air gap increases, the maximum electric field in air gap gradually increases. As the depth of the air gap increases, the maximum electric field in air gap decreases at first and then increases. Also, it shows that the accumulation of heat in the air gap will cause the deterioration of insulation. At last, according to actual defect cases, risk pre-control and prevention measures are proposed.

Key words： cable joint air gap electric field temperature distribution

Received: 17 February 2021

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	CHEN Yin
	HUANG Ruimei

Cite this article:

CHEN Yin,HUANG Ruimei. Simulation analysis of 35kV cable joint with air gap defect based on electrothermal field coupling[J]. Electrical Engineering, 2021, 22(10): 46-50.

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http://dqjs.cesmedia.cn/EN/Y2021/V22/I10/46

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