Numerical Simulation of Coupled Electromagnetic and Thermal Fields in Cable Terminations

This paper deals with the distribution of the conduction current in a high-voltage cable termination with an imperfect insulation or polluted insulation. The thermal effect of the conduction current in an imperfect insulation is included in the model. The case of the variable resistivity of the insulation is included in the analysis of the termination. The effect of a semiconductor control tube is presented. The mathematical model for the electromagnetic field is developed on the basis of Maxwell equations. The heat transfer is described by the heat conduction equation. The numerical models are derived by the Galerkin procedure for axisymmetric fields. The equations are coupled because most of the heat sources are the effects of the electric field and the material properties are temperature-dependent. In our target examples, the coupling between the two fields is a material property as the electrical conductivity or, the heat source