水树枝影响交联聚乙烯电缆绝缘可靠性的试验研究  

Experimental Study of Water Tree Affecting the Reliability of XLPE Cable Insulation

作　　者：沈庆河[1] 郑晓泉[2] 刘嵘[1] 王金锋[2] 刘辉[1] 

机构地区：[1]山东电力研究院,济南250002 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《绝缘材料》2015年第2期44-48,52,共6页Insulating Materials

摘　　要：水树枝生长速度较慢,主要影响聚烯烃绝缘电力电缆的寿命;电树枝生长速度较快,主要影响电缆的可靠性。在高频恒定电压(15k V、20k V)下研究交联聚乙烯电缆中水树枝的生长规律,发现聚烯烃绝缘中的水树枝或电树枝存在相互转化的可能性。试验结果表明:干燥的水树枝引发电树枝的几率最高,湿润水树枝引发电树枝的几率最低,水树枝会影响电缆绝缘的可靠性。Water trees grow very slowly and mainly affect the life of polyolefin insulation power cable.Electrical trees grow very fast and mainly affect the reliability of cable. The growth rule of water treein XLPE cable under high frequency and constant voltage was studied, and the possibility of mutualtransformation between water tree and electrical tree in the polyolefin insulation was found. The resultsshow that the probability of electrical tree intiated by dry water tree and wet water tree is the highestand lowest respectively, and the water tree would affect the reliability of cable insulation.

关 键 词：XLPE 水树枝 电树枝 转化 机理 可靠性 

分 类 号：TM215[一般工业技术—材料科学与工程] TQ325.12[电气工程—电工理论与新技术]