Faramarz Majidi, Somaieh Alavi, Reza Azimi Pirsaraei, Abdollah Heidary, Farhad Asgari,
Volume 5, Issue 3 (10-2012)
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Background and Objectives: Electric and magnetic fields in the workplace are one of
the detrimental factors of power plants, transmission lines, electrical wires,
and electrical equipments, therefore, exposure to these fields might be harmful
for human health. This study aimed to provide information about intensity of
the electromagnetic fields at the high voltage electricity posts and its
comparison with the threshold limit value (TLV).
Materials and Methods: The study was conducted at one of the high voltage electricity post in Zanjan City
having 63, 230, and 400 KV power transmission lines. After identifying stations and measuring the intensity of these
fields, GIS maps were prepared and the values were compared with permissible
values.
Results: The measured
magnetic flux density at different parts of the high voltage post showed that
the lowest and highest intensity were
1.69 and 153.7 mG respectively which were lower than the ACGIH TLVs.The lowest
and highest intensity of the electric
field were 0.008 and 38.07 KV/m
respectively. The highest value belonged to the 400 KV line, which exceeds the
recommended ACGIH TLV (25 KV/m).
Conclusion: According
to the results, the magnetic field intensity was below the TLVs, but the
intensity of electric field measured in the 400 KV line was greater than its TLVs. Thus, the strategies and
recommendations for reducing exposure should be taken.
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