To enhance the operational reliability of the 110 kV basin-type insulator

the finite element analysis is adopted to simulate its electric field.Simulation shows that the inner shield ring has an effect on the surface field intensity of the basin-type insulator

and structural improvement of single inner shield ring has little effect on the surface field intensity.Therefore

the dual inner shield ring is used to improve the surface field intensity of the basin-type insulator.After continuous model modification and simulation comparison

the optimum parameters

i.e.

D=5.29 mm

R=212.6 mm

and V=11.93 mm

are selected for the dual inner shield ring.As a result

the maximum field intensity on the basin-type insulator surface is reduced by 8.15%

and the maximum field intensity at the seal ring junction

air gap

or inner shield ring junction is reduced by-0.35%

36.16%

39.45%

respectively.The dual inner shield ring can effectively reduce surface field intensity of the basin-type insulator

so this ring structure may become a reference form miniaturization design and operational reliability enhancement of the product.