Abstract
The paper presents a calculation method of the magnetic field under an overhead power line taking into account conductor sag, which is described by the catenary curve. The calculations take into account the variability of the charge distribution along the conductor and wire sag for the eclectic field, while the calculation of intensity of the magnetic field take into account the impact of induced currents in the wires of lightning. The simulation results were compared with results measurements.
Highlights
Transmission lines are used to transfer the electric energy for a long distance transmission between substations
The intensity of the magnetic field depends on the current flowing in the phase conductors, currents induced in the earth wires, and wires deployment, wire suspension height, conductor lengths
H is the maximum height of the conductors suspension, h is the minimum height of the conductors suspension in the middle of the span, S is the conductor sag, S = H-h
Summary
Transmission lines are used to transfer the electric energy for a long distance transmission between substations. Generate magnetic fields that adversely affect living organisms. The intensity of the magnetic field depends on the current flowing in the phase conductors, currents induced in the earth wires, and wires deployment, wire suspension height, conductor lengths. Several publications calculated the magnetic fields created by power transmission lines assume that lines are parallel to a flat ground and the sag is neglected or introduced by taking an effective or average height in between the maximum and the minimum height of the line [2, 3]. The paper presents method of calculation the magnetic field intensity with taking into account sag conductors and comparison of calculation results with measurement results [2, 3]
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