一起10kV电缆中间接头击穿故障的原因分析  

Cause Analysis on an Accident of Intermediate Joint Breakdown of 10 kV Cables

作　　者：熊俊 陆国俊 陈志娟[2] 刘刚[2] 阮班义[2] 

机构地区：[1]广州供电局中心试验研究所,广东广州510630 [2]华南理工大学电力学院,广东广州510640

出　　处：《广东电力》2011年第5期89-92,共4页Guangdong Electric Power

基　　金：广东电网公司科技进步项目(DK0010GZ0006)

摘　　要：对广州某地区发生的10kV交联聚乙烯绝缘电缆中间接头击穿故障进行解体检查和分析,判定故障原因可能是冷缩管标线与接头中心线错位12mm,也可能是半导电层倒角不光滑所致。针对此,采用有限元法对接头半导电层处理不合理的各类故障进行电场建模和仿真,并计算接头各部分电场强度的分布。仿真及结算结果验证了击穿机理分析的正确性,同时提出了实际的运行建议。Strip inspection and analysis are employed in intermediate joint breakdown of 10 kV XLPE insulated cables in Guangzhou.It is estimated that the breakdown is either caused by dislocation of 12mm between graticule of cold shrink tube and the central line or chamfer coarseness of semi-conductive layer.Therefore,finite element model is used for modeling of power plants and simulation on unreasonably treated faults in semi-conductive layer,the distribution of electric field intensity in each part of the joint is calculated.The results from simulation and calculation prove the correctness of analysis on breakdown mechanism;in addition,suggestions for practical operation are made.

关 键 词：电缆中间接头 有限元法 电场分布 半导电层 故障机理 

分 类 号：TM247[一般工业技术—材料科学与工程]