高海拔下特高压交流同塔双回输电线路导线电晕损失研究

针对目前我国特高压交流同塔双回输电常用的8×LGJ-630/45导线,基于在西宁市平安县(2 200 m)搭建的特高压电晕笼,系统的研究了8×LGJ-630/45导线在干燥、中雨(6 mm/h)、大雨(12 mm/h)及湿导线的条件下的电晕损失,首次获得了实际高海拔点8×LGJ-630/45导线的电晕笼电晕数据。并以1 000 kV特高压交流同塔双回输电工程典型塔型为例,通过有限元计算软件仿真计算电晕笼内导线和实际线路导线表面电场强度,采用电晕损失等效法,计算了在高海拔地区导线的电晕损失,获得了同塔双回输电线路的电晕损失数据。为我国将来在高海拔地区建设特高压交流输电线路导线选型提供了参考依据。

The Study of Corona Loss of UHV AC Double circuit transmission line on the same towerat High Altitude Area

The research on corona loss in high altitude area of 8×LGJ-630 conductor which is commonly used in UHV AC double circuit transmission in the same tower is studied in this paper based on the UHV corona cage built in the Ping An county(2200m), Xining City.The test conditionincludes dryness, moderate rain(6mm/h),heavy rain(12mm/h)and humidity.For the first time, the corona data of 8×LGJ-630/45 conductors in the corona cage at high altitude were obtained. Then throughfinite element method simulation calculating the electric field intensity of the corona cage wire and the actual line conductor, the corona loss of UHV AC double circuit transmission line in high altitude area is analyzed by the example of typical tower type of 1000kV UHV AC double circuit transmission line on the same tower with corona loss equivalent method. the corona data of double circuit transmission lines on the same tower at high altitude were obtained. It provides reference basis for the selection of UHV AC transmission lines in high altitude area in the future.