Distributed capacitance parameters of multi-conductors are the basis of electromagnetic transient analysis. In order to accurately and efficiently obtain the distributed capacitance between multi-conductors of complex structures

the equations with induction coefficient as an unknown quantity are derived based on the electromagnetic field theory firstly. Secondly

the calculation methods of non-zero elements in the coefficient matrix of the derived equations are given. Then

based on the finite element method

the electric field energy is calculated as the right-end element of the equation system

and the induction coefficient matrix is obtained by solving the equation system. Finally

the distributed capacitance is obtained by the induction coefficient. The method is applied to the calculation of distributed capacitance parameters of a two-conductor transmission line model with analytic solutions. The results under different truncated boundary conditions and meshes are compared and analyzed. The results show that the maximum relative error of capacitance calculation is small under the appropriate truncated boundary conditions and mesh size. The proposed method is applied to the calculation of distributed capacitance parameters of typical overhead lines and winding turns. The proposed calculation method

in which only the boundary conditions need to be applied to the multi-conductors during the modeling

constructs and solves the equations

and extracts the distributed capacitance parameters automatically

which greatly improves the efficiency.