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.