±400 kV直流SF_6气体绝缘穿墙套管研制  

Development of ±400 kV SF_6 Gas-insulated DC Wall Bushing

作　　者：狄谦[1] DI Qian(State Grid Electric Power Research Institute,Beijing 102200,China)

机构地区：[1]国网电力科学研究院,北京102200

出　　处：《高压电器》2018年第8期188-192,198,共6页High Voltage Apparatus

摘　　要：特高压直流穿墙套管是换流站中连接直流场和阀厅的重要关键设备之一,±400 kV直流穿墙套管的研制对于实际工程建设与±800 kV及更高电压等级直流穿墙套管的研制都有着重大意义。文中以额定电压±400 kV,额定电流5 000 A的直流纯SF_6气体绝缘穿墙套管为研制对象。研究了套管在绝缘结构、机械结构及试验工装方面的关键性问题。在绝缘结构设计方面,针对直流电场的特点,建立了直流套管电场优化设计平台;在机械结构设计方面,针对超长导电管挠度较大引起的套管轴对称电场分布畸变的问题,设计了超长导电管内部空间立体结构,有效增大了导管本身惯性力矩;针对超长导电管因热胀冷缩引起的金属材料伸缩问题,设计了带波纹伸缩管的专用接头。经试验验证,满足设计指标,能够应用于直流输电工程中且对更高电压等级直流穿墙套管的研制具有重要参考意义。UHVDC wall bushing is one of the key equipment connected to a DC field and the valve hall in converterstation,the development of ±400 kV HVDC wall bushing for research and development of project needs and ±800 kVas well as higher voltage grade UHVDC wall bushing has a significant. The rated voltage of DC ±400 kV,rated cur-rent 5 000 A pure SF_6 gas insulation wall bushing as research object. The key problems of insulation structure,me-chanical structure and test fixture are studied. In the insulation structure design,according to the characteristics ofDC electric field,a DC electric field optimization design platform of bushing is established. In mechanical structuredesign,the space structure design of the super conductive tube effectively increases inertia torque and solves theproblem of the electric filed distribution distortion caused by large deflection. The design of a special joint with corru-gated tube effectively solves the super conductive tube for metal material expansion problems caused by thermal ex-pansion and contraction. It is proved that it met the design index,and can be applied to DC transmission project andhas important reference significance for the development of high voltage DC wall bushing.

关 键 词：高压穿墙套管 直流 SF6气体绝缘 电场强度 

分 类 号：TM216.5[一般工业技术—材料科学与工程]