An Educational and Research Computational Scenario for Calculating the Distribution of the Radial Component of the Poynting Vector in the Section of the Simplest Coaxial Cable

An educational and research computational scenario has been developed to calculate the distribution of the radial (transverse) component of the Poynting vector in the section of a coaxial cable with a single-layer core and a single-layer shell at constant voltage and current. It is known that the Poynting vector physically represents the density of the electromagnetic power flux, i.e. it characterizes the flow of electricity at the spatial level. The axial component of this vector, inherent only in the insulation layer, characterizes the main (useful, working) power flow, and the radial component, inherent in all layers, is the power take–off flow for thermal (Joule) losses in current-carrying conductors (core and shell). The educational and research analysis of energy flows in such guiding systems as cable and overhead lines, busbars, waveguides, etc., especially in terms of losses at the integral and spatially distributed level, seems to be an urgent task of the electric power industry and electrical engineering. In this paper, such an analysis is presented using the example of a coaxial cable. The proposed scenario is planned to be applied in practical classes and in the independent work of students of the electric power field of training in the theoretical foundations of electrical engineering (end of the section "magnetostatics").