Abstract
With the development of electrical power transmission networks, are resulted the increase and continuous consumption of various power production sources, this is what requires the large quantities of energy construction. The increased demand in electric power employment has generated an raised of operating voltage for transmission lines (HV and VHV). The high voltage overhead transmission lines create electric and magnetic fields, and therefore have elevated serious concern questions about their possible potential effects in human body and environmental great associated with the resulting higher levels of electromagnetic fields strength around these power lines. The accurate evaluation of extremely low frequency electromagnetic fields influences produced by the high voltage overhead power lines on human health and the environment are well very known and analysed in several research works and simulation study projects. In this paper we precise examine and present a methodology for plot the lateral profile of magnetic field distribution in close a three-phase overhead transmission line in single circuit flat horizontal configuration at height 1m above the ground level, In order show the essentials factors affecting in the magnetic fields intensity under and in the vicinity of high voltage overhead transmission line in any point of space surface and ground plane, the analytique calculation results of the lateral profile of magnetic flux density behaviour are obtained by program MATLAB software, which makes it possible better analyser and easy represent the transverse profile of the magnetic field around electric power transmission lines, the numerique simulation results are based in image method and the superposition theorem.
Highlights
The process starts with the given line geometry and with its specified loading conditions
From the simulation of magnetic field intensity, we found the following results present below: Fig.4 illustrates the curve of the lateral profile distribution of horizontal, vertical and total components (Bx, By, Bt) of the magnetic field at height 1m above the ground level in the vicinity of three-phase high voltage overhead power line, as a function of the lateral distance of circuit line, according on the numerique simulation, it is very clear the magnetic field strength increases in symmetrically and continuous manner in the two sides positive and negative of the high voltage overhead transmission line in single circuit flat horizontal configuration, decreases rapidly for significative increases of the lateral distance of overhead power line
Depending on the simulation results, we see the magnetic induction values are maximum in the middle point of the power line at a center distance of phase conductors, decrease quite rapidly in symmetrically manner for significative increase of the lateral distance, to reach the lower values when one moves away from the conductors at a center distance far from power line
Summary
The electricity supply generally has electric and magnetic fields associated with it, high-voltage power lines are a particular source of exposure to elevated levels of these fields. The electrical and magnetic fields will be decoupled, that is to say, they will be independent of each other. It is necessary to take into account that the electrical field is due to the difference in voltage between the power line and the ground and that the magnetic field is generated by the current transported by the line. Assuming that the overhead phase bundles are replaced with equivalent single conductors; assuming these conductors carry sinusoidal currents directed along the axis, with complex amplitudes (phasors) denoted by I1, I2 and I3, and assuming no other currents are present, the complex amplitude of the magnetic induction field vector in a point 1m above ground is obtained, from Ampère’s law, as a simple summation of three terms of the magnetic field components in overhead power line
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