To reduce the level of power frequency electric field exposure that may bring health risks to the substation staff

the layout of electric equipment in substation is optimized to reduce the strength of near-ground electric-field of electric equipment. A three-dimensional geometric model of 220 k V outdoor distribution equipment was built and the actual power frequency electric field distribution was simulated by the simulation software. The equipment region with high electric field level was selected as the region to be optimized. Then fitness function and limitations of the particle swarm optimization mathematical model applied to electric problem was raised. To reduce the external electric field distribution as the optimization goal

the overall optimization was calculated. Moreover

based on the results

the device location was finely tuned in order to reduce the high field strength distribution inside the area. The optimized electric field distribution was compared to the original distribution

and it was found that the fitness function value of the overall optimization was reduced by 83.4%

and the fitness function of the regional optimization reduced by 29.1%. Results show that using PSO to adjust equipment layout can reduce the current level of substation power frequency electric field exposure without the increasing of the construction cost.