500kV超长变电构架纵向支撑的设计优化

OPTIMIZATION OF LONGITUDINAL SUPPORT DESIGN FOR ULTRA-LONG 500 KILOVOLT SUBSTATION STRUCTURES

500kV变电构架的纵向支撑结构一般采用端部斜撑,对于超长构架,通常需要在构架两端设置双斜撑,使得构架总长度增加,造成配电装置场地占地面积加大。依托金官±500 kV换流站500 kV交流出线构架设计,将超长构架纵向支撑结构优化为柱间支撑,从而取消构架两端斜撑。对端部斜撑方案和柱间支撑方案进行了技术经济比较。结果表明:柱间支撑方案具有不低于端部斜撑方案的结构承载力和抗侧刚度,两种方案的结构耗钢量基本相同,柱间支撑方案的支撑结构占地长度大幅减小,相应减小了构架总长度,减小了配电装置场地占地面积。

End bracing is generally used as longitudinal support in 500 kV substation structures,for ultra-long substation structures,double diagonal braces are usually needed in the both ends of the structures,which increase the total length of the structures,resulting in the increase of the area of the distribution device site.Based on the design of 500 kV substation structures of ±500 kV Jinguan Converter Station,the longitudinal support of ultra-long substation structures was optimized to column bracing,which was caused diagonal braces at both ends to be cancelled.The technical and economic comparison between the end bracing scheme and the column bracing scheme was carried out.The results showed that bearing capacity and lateral stiffness provided by the column bracing scheme were no less than the end bracing scheme,and steel consumption was basically at the same level,but the length of the supporting structure of column bracing scheme significantly decreased,which leading to the total length of substation structures reduced,as well as the area of distribution device site.