This paper should be intended as a contribution to the evaluation of the extremely low frequency (ELF) magnetic field produced by power lines in the context of the human exposure to the magnetic field itself; in particular, we consider those situations where the actual geometry of the conductors and the lay-out of the power line(s) have to be taken into account in order to correctly calculate the field. The main implication is that a 3D model of power line has to be used instead of the simpler 2D model which is based on the Biot-Savart law applied to rectilinear and infinite wires. Purpose of this paper is to give operational formulas to be directly applied in all those situations where a 3D evaluation of the magnetic field is needed in order to quantify the environmental impact of one or more power lines on a certain part of the territory.
SUMMARYThe paper presents a numerical method for evaluating induced voltages and currents, at power frequency, on a buried pipeline due to inductive and conductive coupling with a power line in fault condition; both the systems can have generic layouts represented by broken lines. The algorithm consists of a two steps solution of a two wires transmission line model applied at first to the circuit shield wire(s) with earth return and then to the circuit pipeline with earth return. This calculation method is particularly tailored for industrial and real cases applications.
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