电缆中间接头硅橡胶电树枝生长与形貌特性研究  

Growth and Morphological Characteristics of Electrical Tree in Silicone Rubber at Cable Joint

作　　者：李伟 任志刚 刘弘景 周峰 吴麒麟 李明艺 

机构地区：[1]国网北京电科院,北京100075

出　　处：《电力系统及其自动化学报》2017年第6期78-82,共5页Proceedings of the CSU-EPSA

基　　金：国家电网公司科技资助项目(内置局放传感器高压电缆系统的研究)

摘　　要：电缆中间接头硅橡胶(SiR)电树枝的生长已经成为影响交联聚乙烯(XLPE)电缆安全运行的主要因素。本文针对一起电缆中间接头电树枝引发的绝缘击穿故障,模拟研究了SiR绝缘橡胶件的高压屏蔽电极纵向合模缝位置存在气泡对SiR电树枝产生的起始电压及其形貌特征的影响。结果表明:气泡显著降低了SiR电树枝的起始电压,在起始阶段较易产生树枝状和松枝状电树枝,并呈现阶跃式增长。研究成果对降低电缆电树枝生长引发的绝缘击穿事故具有一定的理论与工程价值。The growth of electrical tree in silicone rubber （SIR） at cable joint has become one of the main factors affecting the operation safety of cross-linked polyethylene （XLPE）cables. In this paper, with the focus on an insulation breakdown fault caused by the electrical tree at cable joint, the influence of air bubble at the vertical mold joint of high voltage shielding electrode on the initial voltage and morphological characteristics of SiR electrical tree growth is simulated. The obtained results indicate that the air bubble significantly reduces the initial voltage of electrical tree growth in SiR ; and at the beginning, it is easier to generate the dendritic and pine-like trees, which are characterized by step growth. The findings are of theoretical and engineering values to the reduction of insulation breakdown fault induced by the growth of electrical tree in cables.

关 键 词：电缆接头 硅橡胶 电树枝 气泡 局部放电 绝缘击穿 

分 类 号：TM615[电气工程—电力系统及自动化]