Magnetic field around the new 400kV OH power transmission lines in Libya

In this paper, the magnetic field produced around a 400kV over-head power transmission lines recently commissioned in Libya will be analytically computed. The approximate computations will be done using the image method and applying Ampere's (Biot-Savart's) law considering quasi-static fields and an infinite line sources parallel to a perfectly conducting flat ground plane. The computation domain considered is the 2D free space in the lateral directions perpendicular to the line conductors at 1 and 4m above ground level. The objective of this work is to investigate how safe is the transmission corridor limits (±30m, ROW edges) set by the Libyan government and to account for public awareness. The way of investigation is simply by comparing the field levels to the electromagnetic fields exposure level limit standards set by the ICNIRP. The resulted field values considering different loads are much less than the general public exposure level limit (B=100 µT) recommended by the ICNIRP.