Abstract
This paper considers the method for the calculation of magnetic flux density in the vicinity of overhead distribution lines which takes into account the higher current harmonics. This method is based on the Biot–Savart law and the complex image method. The considered method calculates the values of the magnetic flux density for each harmonic component of the current separately at all points of interest (usually lateral profile). In this way, it is possible to determine the contributions of individual harmonic components of the current intensity to the total value of magnetic flux density. Based on the contributions of individual harmonic components, the total (resultant) value of the magnetic flux density at points of interest is determined. Validation of the computational method is carried out by comparison of the results obtained by the considered calculation method with measurement results. Furthermore, the application of the calculation method was demonstrated by calculating magnetic flux density harmonics in the vicinity of two overhead distribution lines of typical phase conductor arrangements.
Highlights
Advances in technology and increased energy requirements have brought with them a significant increase in the number of nonlinear loads, as well as the use of converter-based distributed generation units
The method for the calculation of magnetic flux density harmonics in the vicinity of overhead lines is validated by the comparison of calculated magnetic flux density with measurement results given in the literature [26]
This paper consider a method for the calculation of magnetic flux density harmonics in the vicinity of overhead lines
Summary
Advances in technology and increased energy requirements have brought with them a significant increase in the number of nonlinear loads, as well as the use of converter-based distributed generation units. Protection (ICNIRP) [18] published guidelines for limiting exposure to time-varying electric and magnetic fields in the frequency range (1 Hz–100 kHz) These guidelines relate to instances when the fields are caused by pure sine currents and voltages, and instances when their harmonic distortion is present. When it comes to simultaneous exposure to multiple frequency fields, which is the case in the vicinity of power facilities with currents polluted by harmonics, specific criterion regarding reference levels should be applied [18]. A method for magnetic flux density harmonics calculation in the vicinity of overhead lines is considered. The considered method is applied to calculate magnetic flux density harmonics in the case of a currently operational medium voltage overhead lines.
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