Charge transport in oil impregnated paper insulation under temperature gradient using transient upstream FEM

Abstract

Charge transport in oil impregnated paper impacts the insulation performance of a transformer. This paper proposes a simulation method for the charge transport in oil impregnated paper insulation. The transient upstream finite element method (FEM) is applied to the transport equations of bipolar charges for establishing a numerical simulation model of charge transport in oil impregnated paper insulation. The method is validated by experimental results. The charge transport and electric field distribution in single-layer oil impregnated paper insulation under different temperature gradients is simulated. The trends of the simulation results are seen to agree with the corresponding experimental results. This paper conducts exploratory research into the simulation of charge transportation phenomenon in oil impregnated paper, and is of importance to the design of oil impregnated paper insulation.