Transmission power lines are a common source of extremely low frequency(ELF) magnetic fields which are usually analyzed as serial lines in one direction.Overhead vertical-type double-circuit power lines,which are gene...Transmission power lines are a common source of extremely low frequency(ELF) magnetic fields which are usually analyzed as serial lines in one direction.Overhead vertical-type double-circuit power lines,which are generally used in Japan,sometimes carry different current for each circuit and change direction.In this paper,we focused on both the angle of direction change and the current balance in order to clarify the characteristics of distribution of magnetic fields at a height of 1 m.The magnetic field distributions were analyzed considering both the angle of power lines changing direction and the current balance of each circuit.The total magnetic field under overhead vertical-type double-circuit power lines with same current was generally reduced in comparison with that under a single-circuit power line due to phase difference.The total magnetic fields around the turning point where the change of transmission lines direction increased because each circuit came closer in that area.The component of B_z effect on total magnetic field was greatest around the maximum of total magnetic fields nearby the turning point.展开更多
文摘Transmission power lines are a common source of extremely low frequency(ELF) magnetic fields which are usually analyzed as serial lines in one direction.Overhead vertical-type double-circuit power lines,which are generally used in Japan,sometimes carry different current for each circuit and change direction.In this paper,we focused on both the angle of direction change and the current balance in order to clarify the characteristics of distribution of magnetic fields at a height of 1 m.The magnetic field distributions were analyzed considering both the angle of power lines changing direction and the current balance of each circuit.The total magnetic field under overhead vertical-type double-circuit power lines with same current was generally reduced in comparison with that under a single-circuit power line due to phase difference.The total magnetic fields around the turning point where the change of transmission lines direction increased because each circuit came closer in that area.The component of B_z effect on total magnetic field was greatest around the maximum of total magnetic fields nearby the turning point.
