Experimental Analysis of Third Harmonic on Zero Line Heating Influence Based on COMSOL

Abstract

In the study of zero-line heating fire hazard caused by the third harmonic, the harmonic content in a high harmonic incidence place is measured, and an indoor physical experiment platform is built as well. Based on the experimental platform, the third harmonic heating experiment on zero lines is carried out with different wire diameters. The heating pattern of zero lines under different working conditions is obtained, which could provide a certain experimental basis for electrical fire prevention in public places. Based on the COMSOL multi-physical field coupling simulation software, the third harmonic heating model of zero line is established, and the curve of temperature distribution gradient and zero line temperature is obtained. The comparison between simulation results and experimental results verifies the accuracy of the simulation model. It provides a theoretical method for a reasonable selection of zero-line diameter, arrangement of zero line layout, and prevention of electrical fire.