In GIS

the spacer is used for separating adjacent gas compartments

supporting conductor

and insulation. Development of a reliable 1 100 k V spacer is very important to ensure the safe service of a1 100 k V GIS. In this paper

the characters of the 1 100 k V spacer developed by NHVS are introduced

and its dielectric performance and mechanical performance are computed with a finite element analysis software. The results show that the grounding shield ring can weaken the electric field strength in the triple zone. The casting process of the spacer is also introduced. This 1 100 k V spacer has passed type test in High Voltage Apparatus Quality Test & Research Center

where its lightning pulse withstand voltage reached 2 880 k V

and its minimum and maximum burst pressure reached 3.15 MPa and 4.0 MPa

respectively

verifying its high dielectric and mechanical performances.