摘要
针对一起近期发生的35 kV电缆中间接头击穿故障,进行了故障接头解体检查和故障原因分析,指出了电缆中间接头压接管施工工艺存在严重缺陷,导致了压接管、电缆主绝缘及预制式接头之间存在台阶气隙,以及局部场强高度集中引起局部放电,最终导致中间接头绝缘击穿,提出了因施工工艺不当导致电缆接头故障的防范措施。
Aiming at the breakdown of the 35 kV cable intermediate joint that occurred recently,the disassembly inspection of the faulty joint and the cause analysis of the fault were performed.The serious defects were found in the construction process of the intermediate joint pressure pipe,resulting in a step between the crimping pipe,the main insulation of the cable and the prefabricated joint.Air gaps,which led to high local concentration of partial field intensity and partial discharge,and eventually insulation breakdown of the intermediate joints.The preventive measures for cable joint failure due to improper construction process were proposed.
作者
黄锋
李婧
HUANG Feng;LI Jing(Electric Power Research Institute,Guangxi Power Grid Co.,Ltd.,Nanning 530023,China)
出处
《电力与能源》
2019年第2期165-167,共3页
Power & Energy
关键词
电缆
中间接头
故障分析
防范措施
power cable
intermediate joint
fault analysis
preventive measures