电缆接头内部气隙放电缺陷下的绝缘劣化程度表征方法

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摘要为研究电缆接头绝缘材料内部气隙放电造成的绝缘裂化程度表征方法,建立基于等离子体-化学的气隙放电混合模型。该模型考虑了泊松方程、电子运输方程、电子能量运输方程、重粒子运输方程以及气隙中主要气体12种粒子等离子化学反应,同时考虑了二次电子发射以及表面电荷积累过程。基于上述模型,结合有限元软件对电缆接头绝缘材料内部气隙放电过程进行仿真。应用参数扫描方法计算得到不同气隙长度下放电脉冲波形,并记录得到不同气隙放电长度下电缆接头放电相位、放电次数及放电幅值特征。统计分析结果表明,随着电缆接头内部气隙增加,放电信号相位、放电脉冲次数以及放电幅值具有明显区别,并将电缆接头放电过程划分为初始阶段、发展阶段、预击穿阶段。基于放电相位、放电次数及放电幅值的特征参数为评估电缆接头绝缘内部气隙放电的裂化程度提供了参考依据。

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	杨帆
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	王晓宇
	杨永明

关键词 ：电缆接头, 气隙放电, 等离子体-化学模型, 劣化评估

Abstract：A plasma-chemical hybrid model was established to study the characterization method of cracking extend for air-gap discharge in internal insulating materials of power cable connector. The model contains the Poisson equation, electron transport equation, electron energy transport equation, heavy particle transport equation and the plasma-chemical reactions of 12 kinds of particles in the air-gap discharge of power cable joint. At the same time, the secondary electrons emission and the surface charge accumulation process were also taken into account. Based on the above model and the finite element software, the air-gap discharge process of insulating materials in the cable connector was simulated. In addition, the discharge pulse waveforms with different gap lengths were obtained using parameter scanning method to count the phase, frequency numbers and amplitude in per circle. Statistics suggest that characteristics of discharge phase, frequency numbers and amplitude have significant differences as the increase of air-gap length. Accordingly, the cracking processes of cable joint were divided into initial stage, development stage, and pre-breakdown stage. The characteristics of phase, frequency numbers and amplitude provide a method for the cracking assessment in the insulating air gap discharge of power cable connector.

Key words： Cable joint gap discharge plasma-chemistry model degradation assessment

收稿日期: 2016-05-30 出版日期: 2017-02-08

PACS:

TM247

作者简介: 杨帆男,1980年生,教授,博士生导师,研究方向输变电设备电磁热力耦合场计算与应用等。E-mail: yangfancqu@gmail.com

引用本文:

杨帆, 杨旗, 程鹏, 王晓宇, 杨永明. 电缆接头内部气隙放电缺陷下的绝缘劣化程度表征方法[J]. 电工技术学报, 2017, 32(2): 24-32. Yang Fan, Yang Qi, Cheng Peng, Wang Xiaoyu, Yang Yongming. Study of Cracking Extent for Gap Discharge in Insulating Material of Power Cable Joint. Transactions of China Electrotechnical Society, 2017, 32(2): 24-32.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I2/24

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