Abstract
The excessive electric field intensity on the surface of the grading ball of the converter transformer bushing will lead to corona discharge, which may damage the secondary control system of the thyristor. Therefore, it is necessary to calculate the electric field intensity on the surface of the converter transformer bushing and the grading ball. In this paper, a three-dimensional finite element model of bushing and grading ball of converter transformer is established, the electric field distributions on the surface of bushing and grading ball are obtained, and the maximum electric field intensity is extracted. The results show that the maximum electric field intensity is at the end of the grading ball in the upper bushing, which is 9.02 kV/cm. The influence of the maximum diameter of grading ball, the distance to the wall, the distance to the ground and the capacitor core on the electric field is analyzed. The results show that the maximum electric field intensity of the upper grading ball can be reduced to 8.46 kV by reducing the distance to the ground. The results can provide reference for the optimization design of the bushing and grading ball structure of the converter transformer, and ensure the safe and stable operation of the converter transformer.
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