抄録
Recently, electric power apparatus tends to be operated under high voltage and larger capacity This makes the electromagnetic environment around the power system so complicated and then, precise measurement and analysis of electromagnetic field are intensely required. However, magnetic field in and around substations is influenced by many factors, such as power-line current conditions, configurations of conductors and ferromagnetic structures, and so on. For this reason, few studies on how such factors affected the magnetic field environment around power system have been reported. In this paper, we investigated the extremely low frequency (ELF) magnetic field environment in 77kV/6.6kV substation. We carried out the simultaneous measurement of the line current and magnetic field distribution in the substation on-site. Based on the current conditions, we could quantitatively characterize the magnetic field environment in 77kV/6.6kV substation. In addition, measurement of an elliptically polarized locus of magnetic field using amorphous wire 3-axis magnetic field sensor was discussed.
