不同温度下局部气压对XLPE电缆电树枝生长及局放特性的影响

发布时间：2018-01-01 15:06

本文关键词：不同温度下局部气压对XLPE电缆电树枝生长及局放特性的影响　出处：《中国电机工程学报》2016年18期 　论文类型：期刊论文

【摘要】：交联聚乙烯(cross-linked polyethylene,XLPE)电缆绝缘热老化产生的气体可能会在电树枝发生处产生局部高气压,为了研究不同运行状况下局部气压对XLPE电缆电树枝引发和生长特性的影响,以XLPE电缆制作绝缘层切块为试验样品搭建了试验系统,研究了不同温度下局部气压作用在电树枝通道时的局部放电特性和电树枝的生长规律。结果表明:XLPE处于玻璃态时,局部气压对电树枝的引发无明显作用,在生长过程中通道内流注的发展因高气压受阻,树枝发展被抑制;XLPE处于高弹态时,气隙放电的产生导致电树枝引发时间大大缩短。在生长发展期,高温造成XLPE结构上的缺陷促进了高气压下局放的发展。试验发现:高温高气压下电树枝很容易贯穿电缆绝缘,严重威胁XLPE电缆的安全稳定运行。
[Abstract]:Crosslinked polyethylene (cross-linked polyethylene, XLPE) cable insulation thermal aging produced gas may produce local high pressure occurred in the electrical tree, in order to study the local pressure effects in different working conditions of initiation and growth characteristics of electrical tree in XLPE cable, XLPE cable insulation production cuts set up a test system to test sample, study the growth of local pressure under different temperature and partial discharge characteristics of electrical trees in the electrical tree channel. The results showed that the XLPE in the glass state, the local pressure on the electrical tree caused no significant role in the growth process of development in the channel due to the high pressure of the streamer, tree development was inhibited; XLPE in the high elastic state, air gap discharge lead to electrical tree initiation time shortened. In the growth period of development, the structure of the XLPE defect caused by high temperature high pressure gas Promotion Bureau It is found that the electrical branches are easy to run through cable insulation at high temperature and high pressure, which seriously threatens the safe and stable operation of XLPE cables.

【作者单位】：西南交通大学电气工程学院;四川电力设计咨询有限责任公司;
【基金】：国家自然科学基金项目(51577159)~~
【分类号】：TM247
【正文快照】： 0引言交联聚乙烯(cross-linked polyethylene,XLPE)作为电力电缆的主要绝缘材料,具有优良的电气和机械性能。XLPE电缆在运行过程中,由于杂质、气泡等缺陷造成局部电场集中会导致绝缘局部击穿,进而形成树枝状放电通道,长期的放电老化最终导致绝缘击穿,影响电力系统安全稳定运

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