Research on 110kV oil impregnated paper capac-itance graded transformer bushings based on the design principle of equal capacitance and steps

Abstract The oil impregnated paper capacitance graded transformer bushings serves as the external connection device of the transformer to support and connect the insulation, and its insulation state is related to the safe and stable operation of substation equipment.In this paper, a simulation model of 110kV oil impregnated paper capacitance graded transformer bushings is constructed on the commercial finite element software platform based on the actual size of the bushing and the principle of equal capacitance and steps. The paper calculate the potential and radial electric field distribution of the bushing under the normal working voltage, and analyze the influence of the aluminum plate on the radial electric field distribution of the bushing, verifying the rationality of the design principle based on equal capacitance and steps.