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局部气压对交联聚乙烯电缆电树枝生长特性的影响

DOI: 10.13336/j.1003-6520.hve.2015.08.016, PP. 2650-2656

Keywords: 交联聚乙烯,电树枝,局部气压,分形维数,扩展系数,局部放电

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Abstract:

为了研究局部气压对交联聚乙烯(XLPE)电缆电树枝引发和生长的影响,分别以XLPE电缆制作插针缺陷和XLPE绝缘层切块为试验样品搭建了试验系统,研究了局部气压作用在电缆绝缘层内壁和电树枝通道内时的局部放电特征和电树枝的生长规律。结果表明气压作用在绝缘层内壁对电树枝的引发和初期的生长没有明显影响,在生长后期对电树枝的生长速度有促进作用,树枝分形维数减小,扩展系数增大;气压作用在电树枝通道内会导致放电模式转变为流注放电,放电脉冲几乎分布在整个相位上。分析表明绝缘层内壁高气压导致大面积高温软化区产生形变是促进电树枝生长的主要因素;树枝通道内高气压使气体密度增加导致碰撞电离加剧是流注放电发生时间提前的原因。

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[32]  通信作者: 周利军1978—,男,博士,教授,博导,主要从事电气设备状态检测与故障诊断方面的教学和研究,E-mail: ljzhou10@163.com

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