Abstract
This paper studies the temporal dynamics of power-line frequency electric and magnetic fields in Saint-Petersburg and environs. It is found that electromagnetic fields generated by high-voltage transmission lines (HVTL) constantly change, depending on their loading and weather conditions. The dependence on weather conditions involves both the direct effect of air electrical conductivity as a function of its humidity, and indirect effects including the dependence of energy consumption on temperature and also the correlations between meteorological characteristics. An attempt has been made to evaluate the role of influencing factors.
Highlights
Electromagnetic pollution as a complex and dynamic process is characterized by spatial variability [1], and by temporal dynamics
If mapping based on one-time measurements at as many points as possible suffices to examine spatial variability employing a common methodology within a limited period, temporal dynamics can be studied only within monitoring, namely, multiple systematic measurements, using the common methodology at the same points
It is important to note that for the most loaded high-voltage transmission lines (HVTL) from those studied, namely, HVTL-330 kV in the area of the Devyatkino subway station, the width of a threshold band of the maximum permissible for residential zones strength of 1000 V/m during observations reached 79 m, what exceeds the standard width of the sanitary protection zone almost fourfold (20 m for HVTL-330 kV according to the SanPiN 2.2.1/2.1.1.1200-03)
Summary
Electromagnetic pollution as a complex and dynamic process is characterized by spatial variability [1], and by temporal dynamics. If mapping based on one-time measurements at as many points as possible suffices to examine spatial variability employing a common methodology within a limited period, temporal dynamics can be studied only within monitoring, namely, multiple systematic measurements, using the common methodology at the same points. Electromagnetic pollution is subject to fast changes depending on work of electrical networks and the equipment, and extend in the changeable air environment. Practical measures for protection of the population must have to consider a real electromagnetic situation
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