一起10 kV箱式柱上断路器击穿故障分析及处理  

Analysis and Treatment of a Breakdown Fault Happening to 10 kV Box-Mode Column Circuit Breaker

作　　者：李啸 赵高超 惠杰 袁玉国 LI Xiao;ZHAO Gao-chao;HUI Jie;YUAN Yu-guo(Changzhou Boil Electric Power Automation Equipments Co.,Ltd,Changzhou 213025,China)

机构地区：[1]常州博瑞电力自动化设备有限公司,江苏常州213025

出　　处：《电工电气》2023年第12期45-48,共4页Electrotechnics Electric

摘　　要：针对某架空线路上的断路器故障导致保护跳闸动作,重合闸未能消除异常,现场发现B相绝缘套管桩头有明显烧蚀发黑的现象,对下杆的故障断路器进行绝缘电阻和套管端子水平度试验,明确了故障部位;查看馈线终端动作报告,拆解并查看箱内元器件情况,对绝缘套管开展X光透视和电场仿真分析,得出故障原因为B相带电主回路贯穿受损的环氧树脂层对壳体产生击穿放电,沿面闪络后引发单相接地故障;对同批次的套管进行机械和电气性能测试,排除套管本身缺陷问题,明确套管开裂原因为其受到瞬间碰撞或人为搬抬时的外力作用导致环氧树脂层受内应力并出现肉眼不可见的裂纹。提出了加强环氧树脂浇注的生产工艺,适时开展工频耐压试验等防范措施。A circuit breaker fault occurring to the overhead lines causes trip protection,the reclosing breaker failed to eliminate the abnormality,and the B-phase insulation sleeve pile head is found to have obvious ablation and blackening phenomenon.Through carrying out the insulation resistance test and bushing terminal levelness test to the fault circuit breaker of the lower pole,the fault part is located.Then,the paper views the feeder terminal action report,disassembles and checks the components in the box,and carries out X-ray fluoroscopy and electric field simulation analysis on the insulation sleeve.It finds out that B-phase charged main circuit penetrates the damaged epoxy resin layer,which produces disruptive discharge to the shell and leads to the single-phase grounding fault after the surface flashover.The mechanical and electric performance tests have been taken to the same batch of sleeves to eliminate their own defects,and the reason for sleeve cracking is the external force produced by instantaneous collision or artificial lifting causes the epoxy resin layer to bear internal stress to generate cracks invisible to the naked eye.Therefore,the paper puts forward preventive measures such as strengthening the production process of epoxy resin pouring and carrying out power-frequency voltage-withstand test in time.

关 键 词：断路器 绝缘套管 击穿 环氧树脂 故障分析 

分 类 号：TM561[电气工程—电器]