Metal particles mixed into the bushing on the valve side of the converter transformer and cracks in the capacitor core are common faults at present. The research on electric field distribution of the bushing under different voltages and the influence of defects on the electric field distribution are of great significance to the optimization design and failure analysis of the bushing. In this paper

the ±800 kV UHV converter transformer bushing is taken as a prototype

a ±72.5 kV epoxy-impregnated paper capacitive bushing simulation model is set up

the potential and electric field distribution of the bushing under AC and DC voltage is calculated

and the influence of two defects on the electric field is researched. The results show that the bushing

in case of containing metal particles or crack defects

has a greater influence on the distortion of the electric field. The research results not only provide a basis for the subsequent analysis of partial discharge tests of different defects in the scaled bushing model

but also provide a reference for the optimal design of epoxy-impregnated paper capacitive bushing.