微米级异物对GIS设备绝缘状态影响研究  

Study on Influence of Micron⁃level Metal Dust on the Insulation Condition of GIS

作　　者：牛勃 孙尚鹏 魏莹 陈磊 马飞越 伍弘 NIU Bo;SUN Shangpeng;WEI Ying;CHEN Lei;MA Feiyue;WU Hong(Power Research Institute of State Grid Ningxia Power Co.,Yinchuan 750001,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,银川750011

出　　处：《高压电器》2022年第3期93-100,共8页High Voltage Apparatus

摘　　要：断路器分合闸过程中不可避免产生微米级金属粉尘,对GIS设备内部绝缘状态具有重要影响。文中以真型363 kV GIS为基础,搭建了可进行520 kV工频耐压、1175 kV雷电冲击耐压的试验平台,用以开展微米级异物下GIS设备绝缘状态影响研究。首先基于2000次机械操作开展微米异物分布特征研究,获取了触头不同磨损次数下的微米级异物变化趋势。其次在不同操作次数下采用脉冲电流法进行放电量检测,同时联合特高频、超声波局部放电检测法,分析不同检测方法对微米级异物放电检测灵敏度。最后采用人工预埋的方式开展微米级金属粉尘对GIS设备绝缘性能的影响,并采用雷电冲击试验方法进行绝缘裕度校核,获取了微米级异物对设备绝缘性能的影响。文中通过微米级异物在真型设备内不同数量不同位置的试验以及对应试验下的局放检测研究,可为设备运维过程中微米级异物对绝缘状态的影响提供技术支撑。Micron⁃level metal dust is inevitably generated during the opening and closing operation of circuit break⁃er,which has a significant influence on the internal insulation condition of GIS equipment.The real 363 kV GIS equipment is taken as the foundation in this paper,a test platform for power frequency withstand voltage at 520 kV and lightning impulse withstand voltage at 1175 kV is set up to carry out the study on the influence of insulation con⁃dition of GIS under micron⁃level foreign matter.First,the study on the distribution of the micro⁃level foreign matter is developed on the basis of 2000 times mechanical operation and the variation trend of micron⁃level foreign matter un⁃der different wear numbers of the contact is obtained.Then,the pulse current method is applied for discharge detec⁃tion under different operation numbers.At the same time,the UHF and ultrasonic partial discharge detection meth⁃ods are combined to analyze the sensitivity of different detection methods to the micron⁃level foreign discharge detec⁃tion.Finally,the artificial embedded method is adopted to study the influence of micron⁃level metal dust on the insu⁃lation performance of GIS,and the insulation margin is checked by the lightning impulse test method and the influ⁃ence of micro⁃level foreign matter on the insulation performance of the equipment is obtained.The study of partial dis⁃charge detection for different quantities of micron⁃level foreign objects at different equipment positions in this paper can provide technical support for evaluating the the influence on insulation condition of the equipment during the op⁃eration and maintenance period.

关 键 词：微米级异物 局部放电 绝缘裕度 GIS 带电检测 

分 类 号：TM595[电气工程—电器] TM855