±1100 kV直流纯SF_6气体绝缘穿墙套管关键技术研究

Key Technology of ± 1100 kV DC Pure SF_6 Insulated Wall Bushing

±1100 k V直流纯SF_6气体绝缘穿墙套管(以下简称±1100 k V直流穿墙套管)为目前世界电压等级最高的直流设备,也是直流输电系统中的关键设备。依托昌吉至古泉±1100 k V特高压直流输电工程,以±1100 k V直流穿墙套管为研究对象,建立了套管的三维物理模型,从直流绝缘材料、电场强度、机械强度及温度场等方面进行优化设计,并制造了±1100 k V直流穿墙套管样机。该样机顺利通过了全套型式试验验证,其各项性能指标均满足工程要求。通过该套管的研制,掌握了特高压直流SF_6气体穿墙套管的关键技术,并可以推广应用到其他电压等级产品中。

± 1100 k V DC pure SF_6 insulated wall bushing（ hereinafter referred to as ± 1100 k V DC wall bushing） is the world＇s highest voltage level DC equipment,and also the key equipment in DC transmission system. Based on the national Changji-Guquan ± 1100 k V UHVDC transmission project,taking ± 1100 k V DC bushing as the research object,this paper establishes the three-dimensional physical model of the bushing,carries out the optimal design from aspects of DC insulation material,electric field strength,mechanical strength and temperature field,and manufactures ± 1100 k V DC wall bushing prototype. The prototype successfully passes the complete type test,w hose performance indexes all meet the requirements of the project. Through the development of the bushing,the key technology of the UHVDC SF_6 wall bushing has been mastered,and it can be applied to other voltage grade products