Power Frequency Еlectromagnetic Fields of Electrical Installations in Buildings

Introduction: All components of the power supply system are sources of electric and magnetic fields of industrial frequency of 50 Hz, both posing risks to human health. Estimation of predicted magnetic field levels from switchboards and transformers inside buildings is challenging and implies the importance of full-scale measurements of electromagnetic fields from built-in electrical equipment.

Objectives: To establish the levels of 50 Hz electromagnetic fields during operation of built-in electrical installations in industrial, public, and residential premises.

Materials and methods: We studied 50 Hz electromagnetic fields generated by electrical installations located in buildings. EMF levels were measured near transformers, switchboards, and switchgear. The electromagnetic situation in the rooms above the electrical equipment was investigated. The assessment of EMF levels was carried out in accordance with the current hygienic standards.

Results: The intensity of electric fields near the equipment and in the surveyed premises was significantly lower than that of magnetic fields. The excess of maximum permissible levels at workplaces of operators servicing EMF sources in residential buildings was not detected. In the rooms of public buildings located above electrical installations, measured values of magnetic field induction ranged from 0.18 to 31 µT. The intensity of magnetic fields depended on the current load and the distance from EMF sources.

Discussion: Electromagnetic field intensity depends on specifications of equipment, current loads, and distances from the sources of electromagnetic fields. Induction of 50 Hz magnetic fields in adjacent rooms may exceed hygienic standards set for residential and public buildings. Additional adverse factors include instability of magnetic fields caused by current load changes and significant magnetic field gradients in premises.

1. Bessou J, Deschamps F, Figueroa L, Cougnaud D. Methods used to estimate residential exposure to 50 Hz magnetic fields from overhead power lines in an epidemiological study in France. J Radiol Prot. 2013;33(2):349–365. doi: 10.1088/0952-4746/33/2/349

2. Smirnova EE, Kataeva ES. Using of environmentally safe electricity sources to enhance environmental safety of the urban planning condition. In: Safety in Construction: Proceedings of the Fourth All-Russian Scientific and Practical Conference with international participation, St. Petersburg, November 21–22, 2019. St. Petersburg: SPbGASU Publ., 2019:126–131. (In Russ.)

3. Bukhtiyarov IV, Rubtsova NB, Paltsev YuP, Pokhodzei LV, Perov SYu. [Innovations in the issue of ensuring electromagnetic safety of workers and the population.] In: Man and Electromagnetic Fields: Proceedings of the Fifth International Conference, Sarov, May 23–27, 2016. Sarov: RFNC-VNIIEF Publ., 2017:47–54. (In Russ.)

4. Boltaev AV, Gazya GV, Khadartsev AA, Sinenko DV. The electromagnetic fields effect on chaotic dynamics of cardiovascular system parameters of workers of oil and gas industry. Ekologiya Cheloveka [Human Ecology]. 2017;(8):3–7. (In Russ.) doi: 10.33396/1728-0869-2017-8-3-7

5. Ryabov YuG, Andreev YuV. Preservation of the health and working capacity of the personnel of modern industrial workplaces and the population by providing comfortable electromagnetic conditions in the human environment. Tekhnologii Elektromagnitnoy Sovmestimosti. 2002;(1):3–12. (In Russ.)

6. Khan MW, Juutilainen J, Roivainen P. Registry of buildings with transformer stations as a basis for epidemiological studies on health effects of extremely low-frequency magnetic fields. Bioelectromagnetics. 2020;41(1):34–40. doi: 10.1002/bem.22228

7. Gajšek P, Ravazzani P, Grellier J, Samaras T, Bakos J, Thuróczy G. Review of studies concerning electromagnetic field (EMF) exposure assessment in Europe: Low frequency fields (50 Hz – 100 kHz). Int J Environ Res Public Health. 2016;13(9):875. doi: 10.3390/ijerph13090875

8. Sirav B, Sezgin G, Seyhan N. Extremely low-frequency magnetic fields of transformers and possible biological and health effects. Electromagn Biol Med. 2014;33(4):302–306. doi: 10.3109/15368378.2013.834447

9. Valič B, Kos B, Gajšek P. Typical exposure of children to EMF: exposimetry and dosimetry. Radiat Prot Dosimetry. 2015;163(1):70–80. doi: 10.1093/rpd/ncu057

10. Pedersen C, Johansen C, Schütz J, Olsen JH, Raaschou-Nielsen O. Residential exposure to extremely low-frequency magnetic fields and risk of childhood leukemia, CNS tumours and lymphoma in Denmark. Br J Cancer. 2015;113(9):1370–1374. doi: 10.1038/bjc.2015.365

11. Salvan A, Ranucci A, Lagorio S, Magnani C, SETIL Research Group. Childhood leukemia and 50 Hz magnetic fields: findings from the Italian SETIL case-control study. Int J Environ Res Public Health. 2015;12(2):2184–2204. doi: 10.3390/ijerph120202184

12. McColl N, Auvinen A, Kesminiene A, et al. European Code against Cancer 4th Edition: Ionising and non-ionising radiation and cancer. Cancer Epidemiol. 2015;39(Suppl 1):S93–100. doi: 10.1016/j.canep.2015.03.016

13. Kheifets L, Ahlbom A, Crespi CM, et al. Pooled analysis of recent studies on magnetic fields and childhood leukaemia. Br J Cancer. 2010;103(7):1128–1135. doi: 10.1038/sj.bjc.6605838

14. Kheifets L, Oksuzyan S. Exposure assessment and other challenges in non-ionizing radiation studies of childhood leukaemia. Radiat Prot Dosimetry. 2008;132(2):139–147. doi: 10.1093/rpd/ncn260

15. Lyubimova NS, Volkov AB, Martemyanov VA. Electromagnetic safety of buildings. Tekhnicheskie Nauki – ot Teorii k Praktike. 2013;(28):158–169. (In Russ.)

16. Kalyada TV, Plekhanov VP. Topicality of monitoring of industrial frequency magnetic fields of 50 Hz in residential and public buildings. Gigiena i Sanitariya. 2019;98(6):597–600. (In Russ.) doi: 10.18821/0016-9900-2019-98-6-597-600

17. Ryabov YuG, Lomaev HV, Repin AA. Normalization of safe and comfortable conditions in the premises of inhabited and public buildings for electricity factors. Tekhnologii Elektromagnitnoy Sovmestimosti. 2019;(4(71)):72–83. (In Russ.)

18. Rozov VYu, Kundius ED, Pelevin DYe. Active shielding of external magnetic field of built-in transformer substations. Electrical Engineering and Electromechanics. 2020;(3):60–66. (In Russ.) doi: 10.20998/2074-272X.2020.3.04

19. Kandel S, Hareuveny R, Yitzhak NM, Ruppin R Magnetic field measurements near stand-alone transformer stations. Radiat Prot Dosimetry. 2013;157(4):619–622. doi: 10.1093/rpd/nct170

20. Çam ST, Fırlarer A, Özden S, Canseven AG, Seyhan N. Occupational exposure to magnetic fields from transformer stations and electrical enclosures in Turkey. Electromagn Biol Med. 2011;30(2):74–79. doi: 10.3109/15368378.2011.566772

21. Zaryabova V, Shalamanova T, Israel M. Pilot study of extremely low frequency magnetic fields emitted by transformers in dwellings. Social aspects. Electromagn Biol Med. 2013;32(2):209–217. doi: 10.3109/15368378.2013.776431

22. Yitzhak NM, Hareuveny R, Kandel S, Ruppin R. Time dependence of 50 Hz magnetic fields in apartment buildings with indoor transformer stations. Radiat Prot Dosimetry. 2012;149(2):191–195. doi: 10.1093/rpd/ncr226

23. Navarro-Camba EA, Segura-García J, Gomez-Perretta C. Exposure to 50 Hz magnetic fields in homes and areas surrounding urban transformer stations in Silla (Spain): environmental impact assessment. Sustainability. 2018;10(8):2641. doi: 10.3390/su10082641

24. Hareuveny R, Kandel S, Yitzhak NM, Kheifets L, Mezei G. Exposure to 50 Hz magnetic fields in apartment buildings with indoor transformer stations in Israel. J Expo Sci Environ Epidemiol. 2011;21(4):365–371. doi: 10.1038/jes.2010.20

25. Thuróczy G, Jánossy G, Nagy N, Bakos J, Szabó J, Mezei G. Exposure to 50 Hz magnetic field in apartment buildings with built-in transformer stations in Hungary. Radiat Prot Dosimetry. 2008;131:469–473.

26. Röösli M, Jenni D, Kheifets L, Mezei G. Extremely low frequency magnetic field measurements in buildings with transformer stations in Switzerland. Scie Total Environ. 2011;409:3364-3369.