Mohammad Ali Zazoul, Mohammad Reza Monazzam, Jamshid Yazdani Charati, Fatemeh Hosseinzadeh,
Volume 21, Issue 2 (2-2012)
Abstract
Introduction: The power transmission lines are the emission source of extremely low frequency (ELF) electromagnetic fields that are considered to have an adverse impact on human health. Therefore the aim of this study was to evaluate the amount of magnetic flux with extremely low frequencies (ELF) around high voltage power transmission lines in the western areas of Tehran in 2012.
Material and Method: In this study the magnetic flux density was measured around three lines of high voltage electricity transmission (63, 230 and 400 kV). The employed device for magnetic flux measurement was Triple axis TES 1394 tester. The measurements were taken according to IEEE standard procedures (Std 644-1994) in four distance ( 0, 5, 10 and 20 m).
Results: The results showed that the amount of the minimum, mean and maximum of magnetic flux density were 0.14,1.43 ±1.25 and 11.51µT respectively. The flux density was lower than the standard international commission on ionizing radiation protection in all cases.
Discussion and Conclusion: The average level of magnetic flux density was about 1.25% of the exposure limit ICNIRP standard (100 µT) around the three lines. Also the magnetic flux density rate decreases with increasing distance from the line and decreasing flow.
Mohammad Ali Zazouli, Mahmoud Mohammadyan2, Seyed Noroddin Mousavinasab, Mostafa Mohajer Darabi, Adele Sarem Safari,
Volume 28, Issue 169 (2-2019)
Abstract
Background and purpose: Considerable increase on the use of electronic devices increased the rate of public occupational exposure to extremely low frequency electromagnetic fields. Assessment of exposure to these fields is highly important due to potential health hazards. This study aimed at investigating the magnetic flux emission from extremely low frequency electromagnetic fields around power lines of high voltage in Neka (north of Iran) and factors affecting the magnetic flux density.
Materials and methods: In this cross-sectional study, 50 sites around high voltage transmission lines were selected and the magnetic flux density was measured at four different distances from the lines. Humidity and temperature were measured in order to assess their impact on magnetic flux density. The extremely low-frequency magnetic field was measured using an electromagnetic field tester (model TES 1394). Statistical analysis was performed in SPSS V17 applying descriptive statistics and one-way ANOVA.
Results: The highest average magnetic flux density was at the 400 kV power transmission line (2.11 ± 1.36 µT). The average magnetic flux density was higher in the afternoon (2.55 µT) compared with that in the morning. The average values for magnetic flux density under the pylon and between two pylons were 1.18 ± 0.75 and 2.55 ± 1.42 µT, respectively. Magnetic flux density decreased by increasing distance from the wire and the environment moisture.
Conclusion: The average magnetic flux density was lower than the standards set by the international commission on non-ionizing radiation protection and American Conference of Governmental Industrial Hygienists. Hence, the health effects would be negligible.
