高压支柱瓷绝缘子小角度纵波探伤缺陷案例分析  

Research on Detecting Flaws on the High Voltage Post Insulators of Ceramic Material by Using Small-Angle Longitudinal Wave

作　　者：孙庆峰 柳青山 骆宗义 华正轩 邹君文 刘学广 SUN Qingfeng;LIU Qingshan;LUO Zongyi;HUA Zhengxuan;ZOU Junwen;LIU Xueguang(Zhejiang Electric Power Boiler ＆ Pressure Vessel Supervision and Inspection Institute Company Limited,Hangzhou 310014,China;State Grid Quzhou Power Supply Company,Quzhou Zhejiang 324012,China;State Grid Jinhua Power Supply Company,Jinhua Zhejiang 321017,China4.State Grid Ningbo Power Supply Company,Ningbo Zhejiang 315016,China)

机构地区：[1]浙江省电力锅炉压力容器检验所有限公司,杭州310014 [2]国网浙江省电力有限公司衢州供电公司,浙江衢州324012 [3]国网浙江省电力有限公司金华供电公司,浙江金华321017 [4]国网浙江省电力有限公司宁波供电公司,浙江宁波315016

出　　处：《浙江电力》2018年第9期28-30,共3页Zhejiang Electric Power

摘　　要：针对某供电公司220 k V基建变电站35 k V高压支柱瓷绝缘子小角度纵波探伤缺陷案例,运用X射线数字成像技术检测、绝缘电阻试验、泄漏电流试验、解剖后宏观检查、孔隙性试验等技术手段,对小角度纵波探伤缺陷支柱瓷绝缘子进行了检测分析。试验结果表明,该支柱瓷绝缘子DR检测无异常缺陷显示,但其绝缘电阻值偏低、泄漏电流超标,解剖后发现瓷体内部存在大面积黄芯,且孔隙性试验不合格。综合分析检测结果,判定该支柱瓷绝缘子不符合挂网运行使用要求。In this paper,based on the unqualified result of the small-angle longitudinal wave detection of a35kV high voltage post insulator of ceramic material in a 220 kV converting station of a power supply compa-ny,technical methods like X-ray digital radiography （DR）detection,insulation resistance test,leakage cur-rent test,macro examination after disassembly and porosity test are used to analyze this high voltage post in-sulator. The tests show that no flaws are found by DR in this ceramic post insulator,but its insulation resis-tance is lower than standard level and its leakage current is higher than standard level;besides,large yellowcore inside is found and porosity test is not up to the standard. In conclusion, the ceramic post insulator can-not be used in power grid for operation.

关 键 词：高压支柱瓷绝缘子 小角度纵波探伤 数字成像技术 缺陷 原因分析 

分 类 号：TM855[电气工程—高电压与绝缘技术]