摘要
全球气候日益变暖,暴雪、重冰和强暴雨等极端恶劣天气频发,输电线路绝缘子(串)在其极端恶劣天气下的电气闪络特性对于中国电网防灾减灾显得尤为重要,亦是国家电网公司建设坚强的智能电网的重要支撑。然而,强暴雨下输电线路绝缘子雨闪事故时有发生,国内外学者对其电气闪络试验的研究尚显不足。因此,笔者以XP-160瓷绝缘子、LXY4-160玻璃绝缘子为试品,开展了人工模拟强暴雨条件下绝缘子串的交流放电试验研究,对强暴雨下污秽绝缘子串的电气闪络试验的试验结果进行了详细分析,研究表明:在强暴雨条件下,绝缘子串雨闪电压与绝缘子下表面污秽无关,并且与串长大致成线性关系;绝缘子串雨闪电压随着雨水流量、雨水电导率的增大而降低,满足负幂函数关系;同时雨帘下落方向不同也会导致绝缘子串雨闪电压不同。文中提出,防治绝缘子串雨闪事故的关键在于防止绝缘子串的雨帘形成及增大淋雨时绝缘子表面电阻,希望研究结果可以指导工程应用实践。
Under the influences of global warming and increasing extreme weather, the rain flashover faults of insulator strings happen with high frequency. Enhanced electrical performance of insulators or insulator strings in extreme weather is important for grid disaster prevention and mitigation,and is also a powerful support for the strong and smart grids in China. However, flashover accidents of insulator strings in heavy rainstorms happen with high frequency, and there is little study on the flashover mechanism and performance of insulator strings in heavy rainstorms. This paper deals with the AC flashover performance of insulator strings in heavy rainstorms. Two types of insulators, XP-160 porcelain insulator and LXY4-160 glass insulator, were tested. The results show that： 1）the rain flashover voltage of the insulator strings is independent on the contamination on lower surface of the insulators, and changes almost linearly with string length;2）the rain flashover voltage decreases with the increase in flux and conductivity of rain, satisfying negative power function relation;and 3）different angles between rain curtain and conductor affect the flashover voltage. It is concluded that preventing formation of rain curtain and increasing surface resistance of insulator can facilitate prevention of rain flashover on insulator strings in rainstorm.
出处
《高压电器》
CAS
CSCD
北大核心
2014年第7期1-7,共7页
High Voltage Apparatus
基金
国家重点基础研究计划(973计划)(2009CB724501)~~
关键词
强暴雨
绝缘子串
闪络电压
污秽
电导率
雨水流量
heavy rainstorm
insulator strings
flashover voltage
contamination
rain conductivity
rain flux
