DISTRIBUTION OF TEMPERATURE AND ELECTRIC FIELD INTENSITY IN A CYLINDRICAL LAYER OF POLYMER DIELECTRIC

A nonlinear one-dimensional problem has been formulated for steady heat conduction at a constant difference of electric potentials on the inner and outer surfaces of a cylindrical layer of polymer dielectric with a temperature dependent thermal conductivity coefficient and specific electrical resistivity. A fixed temperature value on the inner surface of this layer is assumed, and a total thermal resistance between its outer surface and the surrounding environment is assigned. The problem formulation is transformed to integral relations making it possible to calculate distributions of temperature and electric field intensity through the layer thickness. An example is provided of a quantitative analysis of these distributions for a cross-linked polyethylene layer. The results of such analysis make it possible to identify possible areas of application of polymer dielectrics in various electric devices, including those used as electrical insulation of high-voltage direct-current cables and to establish conditions of a thermal breakdown of a dielectric layer
   
Author:  V. S. Zarubin, G. N. Kuvyrkin, I. Yu. Savel′eva
Keywords:  nonlinear heat conduction problem, polymer dielectric, electrical insulation of high-voltage cables, integral relations
Page:  1108