青藏直流工程换流站交流侧外绝缘特性  

External Insulation Characteristic for AC Field in DC Projects Converter Station of Qing-Tibet Plateau

作　　者：曹晶[1,2] 陈勇[1,2] 万启发[2] 何宝龙[3] 孟可风[3] 戴敏[2] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国网电力科学研究院,武汉430074 [3]青海电力科学试验研究院,西宁810008

出　　处：《高电压技术》2009年第10期2411-2415,共5页High Voltage Engineering

基　　金：国家电网公司科技项目(200806)~~

摘　　要：为获得我国青藏高海拔地区220kV换流站设计依据,结合我国青藏高海拔±500kV直流工程,在4000m左右高海拔地区,开展220kV换流站真型构架典型电极以及棒-板操作冲击、雷电冲击试验研究。利用升降法在2.5～4.0m间隙距离内给出换流站交流侧典型电极操作、雷电冲击放电特性曲线。讨论不同海拔高度下操作冲击和雷电冲击放电电压的校正方法,并给出海拔或大气校正因数。通过分析试验数据,推荐换流站交流侧软母线对构架最小空气间隙的选择方法。研究结果表明,在相同的间隙距离下,棒-板间隙的冲击放电电压较典型电极低,同时,在4000m海拔高度下,雷电过电压成为控制换流站构架尺寸的主导因素。In accordance with the project of ±500 kV DC of Qing-Tibet Plateau, at the altitude approximately 4000 m, the real tower test of the typical electrode of 220 kV converter station and rod-plane air gap under switching impulse, lightning impulse were experimentally researched. The switching and lightning impulse flashover characteristic of air gap between 2.5 m and 4.0 m were analyzed. The correction method Of switching and lightning impulse flashover voltage under high altitude was discussed, and the altitude or weather correction coefficient was given. The proper way of determining the least air gap of the electrode to the tower was also recommended. The test results indicate that flashover voltage of rod：plane air gap is lower than that of the typical＇electrode at the same distance, and the lightning impulse voltage becomes the leading factor for controlling the dimensions of the tower of converter station at the altitude of 4000 m areas.

关 键 词：高海拔 换流站 真型构架 放电特性 海拔修正 间隙选取 

分 类 号：TM854[电气工程—高电压与绝缘技术]