To analyze the influences of defects on the electric field distribution

we established a basic model of the UHV GIS spacer by the finite element analysis software

ANSYS. Then

the effects of defects

for instance

gap

protrusion and pit on the electric field distribution of GIS spacer were presented. According to the simulation results

the longer and thinner the gap is

the higher the electric field strength will be. Moreover

sizes of protrusion and pit have no relations with the peak value and distribution of electrical field

and positions hardly affect the electrical field enhancement factor. Adhered metallic particles can significantly enhance the electrical field intensity

enhancement factor will decrease with radius position increasing

and a narrower particle will lead to a larger enhancement factor. For suspended metallic particle case

larger size and shorter distance to spacer surface will lead to higher electrical field. Inner voids with different sizes and positions have almost the same electrical field enhancement factor. Among the investigated defects

adhered metallic particles have the most intensification effect on electric field strength

and suspended metallic particles have the effect in the most widespread area.