Simulation of coupled electric and thermal fields in coaxial cables

This paper deals with the heat generated by ohmic losses in imperfect dielectric insulation of the DC electric cables at a step voltage (with load or no load). A description is given for the solution of coupled electric and heat dissipation problems in high-voltage (HV) insulation formed by solid dielectrics. The problem is described by a coupled thermal-electric set of equations. 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 and/or the heat sources. The scope of this paper is to present some aspects of computational aspects in simulation of coupled electric and heat dissipation problems in insulation of the electric cables.