摘要
绝缘子污闪特性在高海拔地区的输电线路外绝缘选择中起着重要作用,其相关研究主要在人工模拟条件下进行。为此,研究了自然环境高海拔地区绝缘子的污闪特性,通过理论分析提出了高海拔条件下的污闪模型,并在高海拔现场采用湿污法测量了LXY-70型标准悬式玻璃绝缘子的交流污闪特性。结果表明,LXY-70型绝缘子的污闪电压和污秽度满足负幂指数函数关系,并随着污秽度的不断增加而呈现一定的饱和趋势,污秽影响特征指数b的范围为0.288 9～0.314 5;绝缘子交流污闪电压与串长近似呈线性关系;高海拔条件下,随着海拔高度的升高,环境温度的上升,污闪电压下降,其气压影响特征指数m为0.597;其污闪电压正比于绝对温度之比的幂函数,其温度影响指数w为0.272。
The pollution flashover performance of insulators is one of the key factors to be considered in the selection of external insulation for transmission lines at high altitude areas,but at present,most related researches are performed in artificial simulation environments.Therefore,we study the insulator＇s pollution flashover performance in natural environment at high altitude.On the basis of theoretical analysis,a model of pollution flashover at high altitudes is proposed.The AC pollution flashover performance of the glass insulator LXY-70 is also experimentally tested and researched at the high altitude sites using wet pollution method.The test results show that,in high altitude environment,the relation between AC pollution flashover voltage of LXY-70 insulator and the pollution influencing characteristic value is an exponential function with negative power,which shows a saturated tendency along with the increase of pollution and has a pollution influencing characteristic value from 0.288 9~0.314 5.The relation between the AC pollution flashover voltage of LXY-70 insulator and the length of the insulator string is linear.Along with the ascending of the altitude and the environment temperature,the pollution flashover voltage decreases.The influencing characteristic exponent of atmospheric pressure on the pollution flashover voltage is 0.597.The pollution flashover voltage is in a direct proportion to the power function of the ratio of absolute temperatures,and the influencing exponent of temperature is 0.272.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2012年第10期2582-2588,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724501/502/503)
国家创新研究群体基金(51021005)~~
关键词
高海拔现场实验
交流(AC)
标准悬式玻璃绝缘子
污闪电压
气压
温度
high altitude field tests
alternating current（AC）
standard suspension glass insulator
pollution flashover voltage
atmospheric pressure
temperature
