输电线路长棒形瓷绝缘子的耐污性能
发布时间：2018-09-09 10:13
【摘要】：为研究挂网长棒形瓷绝缘子的耐污性能,采用ANSYS三维有限元和全尺寸人工污秽试验等方法对长棒形瓷绝缘子的电位分布、污闪特性、积污规律及有效爬电距离进行了探讨。仿真结果表明:与盘型结构相比,500k V线路长棒形瓷绝缘子串的电位分布更加不均匀,超过50%运行电压集中在高压侧第1节元件上。试验结果表明:长棒形瓷绝缘子交流污闪电压与串长呈线性关系,与等值盐密呈负幂指函数关系;重污秽条件(ρESDD=0.1mg/cm2及ρESDD=0.125 mg/cm2)下,500 k V线路长棒形瓷绝缘子的U50%较双伞型瓷绝缘子低27%~28.2%;此外,长期挂网测量数据表明,长棒形瓷绝缘子在湿润地区运行时表面污秽度可长期维持在较低水平,推荐爬电距离有效系数K≈0.98;而在半湿润地区污秽度则随时间呈指数函数增长,并且长期会趋于饱和,推荐爬电距离有效系数K≈0.89。以上参数可为不同降水量地区的外绝缘选择提供参考。
[Abstract]:In order to study the antifouling performance of the long rod ceramic insulator, the potential distribution, pollution flashover characteristic, fouling law and effective creeping distance of the long rod porcelain insulator were studied by ANSYS 3D finite element method and full-size artificial contamination test. The simulation results show that the potential distribution of the long rod insulator string of 500kV transmission line is more uneven than that of the disk structure, and more than 50% of the operating voltage is concentrated on the first section element of the high voltage side. The experimental results show that the AC flashover voltage of the long rod porcelain insulator is linearly related to the string length and negative power exponential function to the equivalent salt density. Under the condition of heavy pollution (蟻 ESDD=0.1mg/cm2 and 蟻 ESDD=0.125 mg/cm2), the U50% of the long rod porcelain insulator in 500kV transmission line is 27. 28% lower than that of the double umbrella porcelain insulator. The surface contamination degree of long rod porcelain insulators can be maintained at a low level in wet areas for a long time, and the effective coefficient of creeping distance K 鈮，
本文编号：2232089
[Abstract]:In order to study the antifouling performance of the long rod ceramic insulator, the potential distribution, pollution flashover characteristic, fouling law and effective creeping distance of the long rod porcelain insulator were studied by ANSYS 3D finite element method and full-size artificial contamination test. The simulation results show that the potential distribution of the long rod insulator string of 500kV transmission line is more uneven than that of the disk structure, and more than 50% of the operating voltage is concentrated on the first section element of the high voltage side. The experimental results show that the AC flashover voltage of the long rod porcelain insulator is linearly related to the string length and negative power exponential function to the equivalent salt density. Under the condition of heavy pollution (蟻 ESDD=0.1mg/cm2 and 蟻 ESDD=0.125 mg/cm2), the U50% of the long rod porcelain insulator in 500kV transmission line is 27. 28% lower than that of the double umbrella porcelain insulator. The surface contamination degree of long rod porcelain insulators can be maintained at a low level in wet areas for a long time, and the effective coefficient of creeping distance K 鈮，
本文编号：2232089
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