Abstract
The verification of the limits of the population’s exposure to the magnetic field generated by double-circuit power lines from field measurements carried out on site is not trivial. It requires knowledge of the power line current instant values during the measurement period, the determination of the relationship between current and field at the measurement points (made more complex by the double-circuit overhead line configuration) and the use of that relationship to extrapolate the field values. Nevertheless, the verification of exposure limits for double-circuit power lines from on-site measurements is often conducted with rough, or not particularly stringent, procedures. A practical and straightforward procedure of general validity for non-optimized double-circuit lines is proposed here. No specific measurement position or conductors disposition knowledge is required as well as no complex three-dimensional finite element method code is necessary. The procedure, potentially also applicable to high- and extra-high-voltage lines, is validated on a medium-voltage (15 kV) double-circuit overhead power line study case. Exposure limits assessment suggests that if the line is operated at its rated capacity (230/285 A), the 3 μT quality target is missed. Results are provided with a 95% confidence interval ranging from ±100 nT to ±140 nT in all the cases.
Highlights
Electromagnetic fields (EMFs) produced by overhead power lines continue being among the topics collecting most of the attention from both specialized and the general public
This paper proposes a magnetic field calculation procedure for doublecircuit overhead powerlines requiring the sole knowledge of on-site field measurements and the corresponding line currents
This work described a straightforward methodology explicitly developed for nonlinear regression and the least mean squares techniques, it can estimate the proportionoptimized double-circuit overhead power lines
Summary
Electromagnetic fields (EMFs) produced by overhead power lines continue being among the topics collecting most of the attention from both specialized and the general public. Low-frequency EMFs produced by overhead lines are classified as nonionizing radiations incapable of producing mutagenic effects, their capability to induce biological tissue heating remains associated (without any solid and scientific-sounding evidence) with human health effects as cancer development [1,2]. This fear spreading in the general public was accentuated by a set of, debunked, epidemiological studies which emphasized an alleged correlation between low-frequency EMF and childhood leukemia [3,4,5,6,7].
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