高海拔换流站相间操作冲击放电特性分析  

Analysis on Phase-to-phase Switching Impulse Discharge Characteristic of High Altitude Converter Station

作　　者：曹晶[1,2] 万启发[2] 张勤[2] 陈勇[2] 周文俊[1] 霍峰[2] 胡伟[2] 孟可风[3] 康钧[3] 

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》2010年第12期2896-2901,共6页High Voltage Engineering

基　　金：国家电网公司科技项目(SGKJJSKF[2009]554)~~

摘　　要：相间操作冲击放电特性是影响换流站设计尺寸的一个重要方面。我国正在设计建设的青藏高海拔直流联网工程拉萨换流站即将建在约4000m左右的高海拔地区,随着海拔的增加,空气间隙放电电压将明显下降。为解决青藏换流站空气间隙选择和海拔校正问题,首次在平原地区以及近4000m高海拔地区,利用升降法开展换流站真型构架典型电极相间操作冲击试验研究,得到典型电极相间操作冲击放电特性曲线。结合现有标准中海拔及气象校正公式进行分析和比较,并给出校正因数,同时,基于不同海拔点试验数据拟合出线性形式的海拔校正算式。研究结果表明,受到海拔高度影响后,高海拔换流站典型电极相间操作冲击平均击穿场强比低海拔低近40%,提出线性形式校正方法的校正误差小于现有标准中推荐方法,其校正误差绝对值可以控制在<4%。Phase-to-phase switching impulse performance plays an important role in the design of converter station.Lhasa converter station of Qing-Tibet Plateau DC Interconnection Engineering will be built at the altitude approximately 4000m.Discharge voltage of air gap will be decreased sharply when the altitude increase.In order to solve the problems of air gap selection and altitude correction of the project,the real tower test research of the typical electrodes of converter station under phase-to-phase switching impulse voltage were experimentally performed respectively both at flat area and high altitude area.The test results of phase-to-phase switching impulse discharge performance were reported.Altitude or weather correction coefficients were given in accordance with the existing standards and test results based on different altitude were fitted to liner form formula.It indicated that the phase-to-phase average discharge field intensity of high altitude was lower about 40percent than flat area,and correction error of the liner form formula is lower than that of the existing standards,by which the absolute value of correction error can be controlled at less than 4percent.

关 键 词：高海拔 换流站 空气间隙 相间操作冲击 放电特性 海拔校正 

分 类 号：TM721.1[电气工程—电力系统及自动化]