电缆接头内部气隙放电缺陷下的绝缘劣化程度表征方法

发布时间：2018-07-16 18:48

【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。
[Abstract]:In order to study the characterization of the degree of insulation cracking caused by the internal air gap discharge in the insulating material of the cable joint, a plasma chemical vapor gap discharge hybrid model is established. The model considers the Poisson equation, the electron transport equation, the electron energy transport equation, the heavy particle transport equation and the 12 particle plasma chemistry of the main gas in the air gap. At the same time, the two electron emission and the surface charge accumulation process are considered. Based on the above model, the internal air gap discharge process in the insulation material of the cable joint is simulated with the finite element software. The discharge pulse waveform under the different air gap length is calculated by using the parameter scanning method, and the cable is recorded under the different air gap discharge length. The phase of the joint discharge, the number of discharge and the characteristic of the discharge amplitude. The statistical analysis shows that with the increase of the air gap in the cable joint, the phase of the discharge signal, the number of discharge pulse and the amplitude of discharge are distinctions, and the discharge process of the cable joint is divided into the initial stage, the development stage and the prebreakdown stage. The characteristic parameters of the number and discharge amplitude provide a reference basis for evaluating the degree of cracking of the air gap discharge in the cable joint insulation.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网四川省电力公司成都供电公司;国网浙江省电力公司电力科学研究院;
【分类号】：TM247

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