Optimization of Capacitor Core Parameters for Rubber-Impregnated Fiber Bushing of Ultra-High Voltage AC Transformer

The rubber-impregnated fiber high-voltage bushing boasts properties such as fire, explosion and moisture resistance, which have been widely promoted over recent years. The capacitor core is one of the core components of the Ultra-high voltage (UHV) AC rubber-impregnated fiber bushing, which is accident-prone as a result of its complex working conditions. On the basis of the initial structural parameters of 1100 kV AC transformer rubber-impregnated fiber bushing, this paper constructs a finite element model of 1100 kV AC transformer rubber-impregnated fiber bushing, which mainly focuses on the analysis of the electric field distribution of the capacitor core, analyzes the influence law of the length, thickness and spacing of the pole plate of the capacitor core on the maximum electric field strength, thereby proposing a bushing capacitor core design scheme. The results show that, in comparison with the initial scheme, the maximum Electric field strength at the end of the capacitor core pole plate is 16.886 kV/mm, which is 17.8% lower than that of the initial scheme, while the maximum electric field strength in the radial direction is 5.420 kV/mm, which is 7.6% lower than that of the initial scheme. The results can give references to the structural design of the 1100 kV AC transformer rubber-impregnated fiber bushing.