配电电缆附件复合绝缘界面缺陷类型和位置对电场分布的影响研究

doi:10.19595/j.cnki.1000-6753.tces.210521

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Abstract Distribution cable accessory is the key component of distribution network system, and its composite insulation XLPE/SIR interface is the weakest insulation position. In this study, the typical defects that occur during the installation and operation of cable accessories has been simulated, seven kinds of interface defects, such as bubbles, air gap, water droplets, water film, metal impurity, semi-conductive impurity and insulation impurity, were designed at the interface of composite insulation XLPE/SIR of cable accessories, the internal electric field distortion law of cable accessories with typical defects is studied by establishing the electric field simulation model of interface defects of distribution cable accessories. The simulation results show that the maximum field distortion caused by bubble defect and air gap defect at the interface is 13kV/mm and 4.58kV/mm, respectively. With the increase of bubble defect size, the electric field distortion increases slightly. The maximum electric field distortion caused by water drop defect and water film defect is 2.94kV/mm and 3.74kV/mm, respectively. With the increase of defect size, the electric field distortion becomes more serious. When the defect size is doubled, the maximum electric field distortion caused by water droplets and film increases by 18.7% and 16%, respectively. As the defect moves away from the root of the stress cone, the electric field distortion caused by metal defects and semi-conductive defects increases first and then decreases, the maximum distortion electric field appears at about 2mm away from the stress cone, which is about 3.65kV/mm. In contrast, the maximum electric field distortion caused by insulation defects occurred at the root of the stress cone, which was about 8.74kV/mm, and with the defect away from the root of the stress cone, the electric field distortion shows an obvious downward trend. This work has important guiding significance for fault analysis and operation maintenance of cable accessories of distribution network.

Key words： Electric cable accessory compound insulation interface defect electric field simulation

Received: 15 April 2021

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TM853

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	Li Guochang
	Liang Xiaojian
	Wei Yanhui
	Su Guoqiang
	Lei Qingquan

Cite this article:

Li Guochang,Liang Xiaojian,Wei Yanhui等. Influence of Composite Insulation Interface Defect Types and Position on Electric Field Distribution of Distribution Cable Accessories[J]. Transactions of China Electrotechnical Society, 2022, 37(11): 2707-2715.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210521 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I11/2707

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