换流站交流滤波器用避雷器瓷外套疑似放电痕迹分析  

Analysis on the Suspected Discharge Trace of Outer Insulating Porcelain of AC Filter Arrester in Convertor Station

作　　者：罗新 张煌 何进西 齐向东 LUO Xin;ZHANG Huang;HE Jinxi;QI Xiangdong(Guangzhou Bureau,CSG EHV Power Transmission Company,Guangzhou 510663,China;School of Electric Power,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]南方电网超高压输电公司广州局,广州510663 [2]华南理工大学电力学院,广州510640

出　　处：《电瓷避雷器》2020年第2期119-124,共6页Insulators and Surge Arresters

摘　　要：避雷器瓷外套是保护避雷器不受外界环境影响的一道防线,瓷外套保持绝缘性能良好对避雷器的安全运行具有重要意义。利用有限元法建立了避雷器三维模型,研究了晴天和雨天、工频电压和操作过电压下避雷器顶部螺栓对瓷外套电场的影响,并分析了现场避雷器的疑似放电痕迹产生原因。结果表明,螺栓过长使得空气间隙平均电场强度增大,遭受操作过电压时很可能发生击穿;淋雨状态下,螺栓形成水柱后,螺栓和伞裙空气间隙击穿很可能发生击穿;伞裙形成水柱后,伞裙间空气间隙也很可能发生击穿,形成放电痕迹。因此,在运行中应避免避雷器顶部法兰螺栓过长,或采取螺栓反装措施。The porcelain of the arrester is to protect arrester from the influence of the external environ-ment,so keeping the insulation performance of the porcelain well is a great significance for the safe oper-ation of the arrester.The three dimensional model of the arrester is established by the finite elementmethod,the influence of the top bolt of the arrester on the electric field under the clear and rainy days,and the power frequency voltage and the operating overvoltage are studied.Besides,the causes of suspec-ted discharge trace of field arresters are analyzed.The results show that the average electric field strengthof the air gap increases with the longer bolt,and the breakdown is likely to occur when the overvoltage issubjected.In the rain state,the bolt and the air gap of the shed profile are likely to break through whenthe water column is formed,and the air gap between the shed profile is likely to break after the shed pro-file forms the water column,forming a discharge trace.Therefore,it is necessary to avoid too long boltson the top flange of the arrester,or to take the opposite arrangement measures.

关 键 词：避雷器 瓷外套 绝缘性能 电场 淋雨 伞裙 

分 类 号：TM862[电气工程—高电压与绝缘技术]