SUMMARY A new practical approach to the shifted frequency method for grounding impedance measurements of high‐voltage substation is presented in this paper. The results obtained by the proposed method are compared with the corresponding results obtained by the transition method as well as by the heavy‐current injection method. It is shown that the proposed approach gives an accurate assessment of the grounding impedance in the presence of power frequency interference. This method is easy to implement. Copyright © 2014 John Wiley & Sons, Ltd.

Power frequency electric and magnetic field levels which occur inside 110/x kV substations are analyzed in this paper in order to assess the exposure of workers to these fields. The analysis is based on results of electric field strength and magnetic flux density measurements inside 110/x kV substations in Serbia. The measurements were performed along the transport routes, near the HV/MV equipment and the power transformers, as well as inside and in the vicinity of the control buildings, with the purpose of estimating maximum field levels which can occur inside these substations. In order to estimate the exposure of workers to these fields, the obtained results were compared to the action levels prescribed by Directive 2013/35/EU. The first objective of the analysis performed is to reach general conclusions about field levels which can occur inside substations of the mentioned voltage level. The second objective is to check whether these levels comply with the action levels prescribed by Directive 2013/35/EU.

The paper presents the methodology for determining the area in the vicinity of overhead power lines where the levels of non-ionizing radiation are significant in the context of current regulations referring to the protection of the general public in the Republic of Serbia. A brief review of Serbian legislation on protection of the general public from power frequency electromagnetic fields is given. The zones of influence of 110 kV, 220 kV and 400 kV transmission overhead power lines are determined by calculations. The configurations of power lines which result in the widest zone of influence are analyzed for each voltage level. The influence of phase conductor heights on the width of the zone is also considered. Determining the width of the zone of influence is very important for planning the construction of new power lines near residential areas, as well as for the construction of residential buildings near existing lines. It is also significant when it is necessary to determine the locations in the vicinity of overhead power lines where more detailed testing of non-ionizing radiation should be performed by measurements.

Рад се бави актуелном проблематиком изложености људи електричним и магнетским пољима. На примеру трансформаторске станице 400/110 kV дат је детаљан приказ испитивања електричних и магнетских поља индустријске учестаности. Добијени резултати су анализирани и упоређени са референтним граничним нивоима прописаним националном регулативом из области заштите становништва од нејонизујућег зрачења. Кључне речи: трансформаторска станица 400/110 kV, електрично пољe, магнетска индукција, нејонизујуће зрачење, зона повећане осетљивости.

Рад се бави актуелном проблематиком изложености људи високофреквентном електромагнетском пољу у животној средини. У раду су приказани резултати испитивања која су спроведена у зонама повећане осетљивости које се налазе у близини базних станица мобилне телефоније и радио и телевизијских предајника. Добијени резултати су анализирани и упоређени са референтним граничним нивоима прописаним националном регулативом из области заштите становништва од нејонизујућег зрачења. Кључне речи: електромагнетско поље, нејонизујуће зрачење, јачина електричног поља, зона повећане осетљивости, базна станица мобилне телефоније, радио предајник, ТВ предајник.