35kV DNF7型分段引线手车柜绝缘击穿故障研究  

Insulation Breakdown Fault of 35 kV DNF7 Type Sectionalized Feeder Switchgear

作　　者：周家玮 郑经纬 ZHOU Jiawei;ZHENG Jingwei(State Grid Ultra High Voltage Branch,SMEPC,Shanghai 200063,China)

机构地区：[1]国网上海市电力公司超高压分公司,上海200063

出　　处：《电力与能源》2024年第6期767-769,共3页Power & Energy

摘　　要：分析了一起发生在上海电网某220 kV变电站的35 kV四/五分段引线手车柜绝缘击穿故障案例。通过现场检查、解体分析以及绝缘件性能测试,发现故障根源在于长期运行的DNF7型开关柜触头盒绝缘材料老化、吸潮后绝缘性能下降。基于此,提出了针对性的故障处理措施和后续防范策略,包括加强局放检测、制定开关柜改造计划和绝缘件大修方案,以避免类似故障发生。This paper provides a detailed analysis of a 35 kV fourth/fifth type sectionalized feeder switchgear insu⁃lation breakdown fault that occurred at a 220 kV substation in Shanghai.Through on-site inspections,disassem⁃bly analysis,and insulation material performance testing,the root cause of the fault was identified as the insula⁃tion performance reduction of the DNF7 switchgear contact box insulation material due to the aging and mois⁃ture absorption after the long-term operating.Thereupon,targeted fault handling measures and follow-up preven⁃tive strategies are proposed,including strengthening partial discharge detection,developing a switchgear modifica⁃tion plan,and implementing insulation component overhauls to prevent similar faults from recurring.

关 键 词：配电网 手车柜 绝缘击穿 跟踪电阻测试 

分 类 号：TM73[电气工程—电力系统及自动化]