3D GIS for surface modelling of magnetic fields generated by overhead power lines and their validation in a complex urban area

This paper presents a study on magnetic field radiated from 132/275kV overhead power lines. The magnetic field radiation from overhead power lines have become a concern to the public due to its adverse health effects such as leukemia in children. A report from World Health Organization (WHO) stated that radiated magnetic fields from overhead power lines may cause leukemia in children if they are exposed to it every day. Therefore, the main objective of this study is to measure the magnetic field radiated from 132/275kV power lines. EMDEX II, a free body meter is used to measure the magnetic field at 1 meter above ground level and the lateral profile was proven using MATLAB calculation. The measurement was done at SJK (T) Gelang Patah and Taman Pulai Utama at a distance of 35 meter from the outermost conductor. The results from both locations show that the radiated magnetic field is much lower than the exposure limit stated in the ICNIRP standard, in which the highest data recorded is only 4mG. The lateral profile magnetic field also shows that exposure to magnetic fields directly below the overhead power line are within the ICNIRP recommended exposure limits. Thus, it can be concluded that the magnetic field radiated by 132/275kV power lines in Malaysia operate at a safe level.

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Assessment of exposure of electric and magnetic fields of industrial frequency on overhead power lines with voltage of 500 and 750 kV

Russian Journal of Occupational Health and Industrial Ecology ◽

10.31089/1026-9428-2020-60-11-797-800 ◽

2020 ◽

Vol 60 (11) ◽

pp. 797-800

Author(s):

Tatyana A. Konshina

Keyword(s):

Magnetic Fields ◽

Numerical Models ◽

Estimation Method ◽

Power Lines ◽

Work Shift ◽

Instrumental Assessment ◽

Electric And Magnetic Fields ◽

Permissible Levels ◽

Overhead Power Lines ◽

Industrial Frequency

Introduction. Certain types of work in the vicinity of overhead power lines may be accompanied by prolonged presence of personnel during the work shift in areas where the maximum permissible levels of electric and magnetic fields of industrial frequency are exceeded. The aim of study is a comprehensive theoretical and instrumental assessment of the exposure of electric and magnetic fields of industrial frequency in places where personnel may stay when working near overhead power lines with a voltage of 500 and 750 kV. Materials and methods. The measurement points were determined using a matrix estimation method, taking into account the location of phases and sanitary protection zones of overhead power lines. The development and calculation of numerical models were carried out in the three-dimensional modeling environment SEMCAD X 14.8.6. Results. As a result of instrumental assessment of electric and magnetic fields of industrial frequency, places with exceeding the maximum permissible levels of the electric field of industrial frequency for a work shift were identified, which indicates the need to limit the time spent by personnel without the use of personal protective equipment. At the same time, no excess of the maximum permissible levels of the industrial frequency magnetic field was detected. Conclusions. The obtained numerical models of 500 and 750 kV overhead transmission lines when evaluating the levels of electric and magnetic fields of industrial frequency showed compliance with the data obtained during field measurements. This allows further research to assess the exposure of personnel performing work without removing voltage on overhead power lines of 500 and 750 kV.

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