For evaluating power frequency electromagnetic field in working corridor of a high voltage substation

a calculation model of power frequency electric field in working corridor of high voltage substation is proposed by combining boundary element method（BEM） and charge simulation method（CSM） and by considering the interference from switching equipment.According to the structural characteristics of equipment in substation

indirect boundary integral equation of the interface of the suspension electrode and the dielectric is deduced

and the corresponding algebraic equations and calculation formulas of matrix elements are presented.Caculation method of the power frequency electric field in substation is implemented.Furthermore

a typical 500 kV substation is taken as an example to calculate the power frequency electric fileds of single equipment and single-phase equipment in the substation

and simulation is performed with the software IES-Coulomb to verify the correctness of the calculation.The proposed model and calculation method can be applied to design of UHV substation for estimating the power frequency electric field and improving the electric field distribution in working corridor.