不同温度下受潮电缆终端头的绝缘状态研究  

Research on Insulation Condition of Damp Cable Joint under Different Temperatures

作　　者：李巍巍[1] 朱轲[1] 吴驰[1] 方欣[1] 朱斌[2] 袁野[2] 张雨津 贾志东[2] 游蛟 

机构地区：[1]国网四川省电力公司电力科学研究院,成都610000 [2]清华大学深圳研究生院,深圳518055

出　　处：《环境技术》2016年第4期6-10,23,共5页Environmental Technology

基　　金：国家自然科学基金(51477085);国网四川省电力公司2015年科技项目(521997150009)

摘　　要：近年来,中压电力电缆在城市输配电网中得到了大量使用,然而电缆附件故障呈现逐年增加的趋势。电缆附件的制作和运行过程中,环境中的水分较易进入附件,导致受潮,从而影响其绝缘状态,最终引发绝缘故障。本文搭建了电缆温升试验平台,选取4条不同程度受潮的终端头的电缆,通过负荷温升试验,在不同温度下,测量受潮终端头的绝缘电阻和介质损耗角正切,研究终端头的绝缘电阻和介质损耗受温度、受潮程度影响的变化规律,进而研究受潮电缆终端头在不同温度下的绝缘状态变化情况。试验中,电缆终端头处出现了不同程度的排水现象。随着温度的升高,受潮终端头由于水分排出受潮程度减轻,绝缘状态逐渐上升;随着温度的继续升高,温度对绝缘材料的影响逐渐成为影响绝缘状态的主要因素,电缆终端头的绝缘状态逐渐下降。In recent years, medium voltage power cable has been widely used in the transmission and distribution network, However, the fault rate of cable accessories increases year by year. During the fabrication and running of cable accessories, the moisture can easily enter into cable accessories and make it damp, which will influence the insulation condition and lead to the failure of cable. In this paper, the temperature-rise test platform for cable was built, and four cables with damp cable joints were selected. The insulation resistance and dielectric loss tangent under different temperatures were measured to study the variation law of insulation resistance and dielectric loss tangent influenced by temperature and damp degree. There was evaporation of moisture during the test. With the rise of temperature, the damp degree of joint was mitigated, and the insulation conditions improved, due to the evaporation of moisture. As the temperature continued rising, the effect of temperature on the insulating materials gradually become the main factor affecting the state of insulation, and the insulation conditions went down.

关 键 词：XLPE电缆 受潮终端头 绝缘电阻 介质损耗角正切 

分 类 号：TM855[电气工程—高电压与绝缘技术]