New Equivalent Circuit of Oil-Paper Insulation and Its Parameters Identification

In order to finding more perfect dielectric response function, the mixed polarization equivalent circuit model is proposed by combining interface polarization equivalent circuit model in oil paper insulation, which fit the actual relaxation process of oil paper insulation system. At the same time, to resolve complex computational problems of parameters identification quickly, the method of parameters identification for mixed polarization circuit model is presented based on particle swarm optimization algorithm. Finally, through the analysis and comparison of examples, confirmed that the mixed polarization circuit model is correct and has higher accuracy compared to the Debye equivalent circuit model, and can more truly reflect the relaxation process of oil paper insulation system.