Additional losses in massive copper conductor due to eddy-currents

Abstract

While measuring the resistive losses in transformer windings, a great difference between the measurement results of additional losses was noticed due to the skin-effect at the transformer without box and the theoretical calculated results. In order to find the reason for the phenomenon, measurements of resistive losses in a massive copper conductor were done in laboratory. Also, tests were performed in inductive furnace for metal melting. The conclusion is that the equivalent propagation depth value of the power must be taken into account instead of the equivalent propagation depth value of the electrical field. Also, the equivalent propagation depth in a cylindrical conductor has higher value than in the event of the conductive plane.