Calculation and optimization on electric field intensity of ultra-high voltage transformer coil

The 3-D substantial model is built for an ultrahigh voltage transformer coil, the equipotential shielding and the bushing end. This model is properly simplified according to the symmetrical structure of the coil. The electric field intensity around the transformer high-voltage coil and the equipotential shielding are calculated on the basis of the finite element method. It is found that the distribution of the electric field is determined, and the maximum electric field intensity at top and bottom are 8.91×10⁶ V/m and 7.06×10⁶ V/m, respectively. The maximum electric field intensity is significantly decreased by 18% with the zero-order optimization method. The results of the calculation and optimization provide basis for designing the coil and equipotential shielding of an ultra-high voltage transformer.