Abstract
In recent years, electric power transmission lines and power apparatus tend to be operated under higher voltage and larger capacity. These trends cause changes in the electromagnetic environment around them, and thus the precise measurement and analysis are required. Magnetic field distribution around power transmission line is very complicated because of the three-phase current condition, the three-dimensional configuration of conductors, the existence of ferromagnetic structure, and so on. Moreover, little attempt has been ever tried to measure the relationship between power-line current condition and the magnetic field distribution; thus, the effects of current condition, for example harmonic component have not been fully understood.
From these backgrounds, we firstly measured the magnetic field distribution using reduced-scale transmission line model under the current condition including harmonics. Next, at the site of actual power transmission line, we simultaneously measured the magnetic field distribution and the current of power lines. As a result, the effect of harmonic component on the magnetic field distribution was quantitatively clarified.
