scholarly journals Reduction of magnetic field level in residential old buildings from overhead power lines by means of active screening

2021 ◽  
pp. 24-29
Author(s):  
B. I. Kuznetsov ◽  
T. B. Nikitina ◽  
I. V. Bovdui ◽  
V. V. Kolomiets ◽  
B. B. Kobylianskiy
Keyword(s):  
Magnetic Field ◽  
Residential Buildings ◽  
Experimental Studies ◽  
Spatial Arrangement ◽  
Power Lines ◽  
Active Screening ◽  
Overhead Power Lines ◽  
Active Shielding ◽  
The Magnetic Field ◽  
Storey Building

Aim. Reduction of the magnetic field induction to the level of modern sanitary standards by means of active screening in residential old buildings which are located near existing typical overhead power lines are considered. Active shielding of the magnetic field inside a single-storey and multi-storey building is considered. During the design the number, configurations, spatial arrangement of the shielding windings, as well as the currents in the shielding windings were determined. Methodology. The design problem for the system of active shielding reduced to solving the minimax vector optimization problem. The vector of objective function in this minimax problem is calculated based on Biot-Savart's law. The solution of this problem is based on multi-agent optimization algorithms. Results. The results of theoretical and experimental studies of the systems of active shielding of the magnetic field generated by various overhead power lines inside a single and multi-storey building are presented. Originality. The possibility of reducing the induction of the initial magnetic field inside the shielded space to the level of sanitary standards is shown. Practical value. From the point of view of the practical implementation for a reasonable choice of the number and spatial arrangement of shielding windings of systems for active shielding of the magnetic field generated by various overhead power lines inside residential buildings of different storey’s are given.

scholarly journals SYNTHESIS OF AN ACTIVE SHIELDING SYSTEM OF THE MAGNETIC FIELD OF POWER LINES BASED ON MULTIOBJECTIVE OPTIMIZATION

2016 ◽  
Vol 0 (6) ◽  
pp. 26-30 ◽  
Author(s):  
B. I. Kuznetsov ◽  
T. B. Nikitina ◽  
A. V. Voloshko ◽  
I. V. Bovdyj ◽  
E. V. Vinichenko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Multiobjective Optimization ◽  
Power Lines ◽  
Active Shielding ◽  
The Magnetic Field ◽  
Shielding System

scholarly journals The influence of conductive passive parts on the magnetic flux density produced by overhead power lines

2019 ◽  
Vol 32 (4) ◽  
pp. 555-569
Author(s):  
Slavko Vujevic ◽  
Tonci Modric
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Biological Effects ◽  
Research Work ◽  
Power Lines ◽  
Magnetic Flux Density ◽  
Human Beings ◽  
Overhead Power Lines ◽  
The Magnetic Field

There has been apprehension about the possible adverse health effects resulting from exposure to power frequency magnetic field, especially in the overhead power lines vicinity. Research work on the biological effects of magnetic field has been substantial in recent decades. Various international regulations and safety guidelines, aimed at the protection of human beings, have been issued. Numerous measurements are performed and different numerical algorithms for computation of the magnetic field, based on the Biot- Savart law, are developed. In this paper, a previously developed 3D quasistatic numerical algorithm for computation of the magnetic field (i.e. magnetic flux density) produced by overhead power lines has been improved in such a way that cylindrical segments of passive conductors are also taken into account. These segments of passive conductors form the conductive passive contours, which can be natural or equivalent, and they substitute conductive passive parts of the overhead power lines and towers. Although, their influence on the magnetic flux density distribution and on the total effective values of magnetic flux density is small, it is quantified in a numerical example, based on a theoretical background that was developed and presented in this paper.

MAGNETIC FIELD MEASUREMENT FROM 132/275 KV OVERHEAD POWER LINES

2016 ◽  
Vol 79 (1) ◽  
Author(s):  
Viloria Sherryl Jimbin ◽  
N. A. Ahmad
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
World Health ◽  
Power Lines ◽  
Magnetic Field Measurement ◽  
Exposure Limits ◽  
Overhead Power Lines ◽  
The Magnetic Field ◽  
Leukemia In Children ◽  
Lateral Profile

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. 

scholarly journals Overhead power lines magnetic field reducing in multi-story building by active shielding means

2021 ◽  
pp. 23-29
Author(s):  
B. I. Kuznetsov ◽  
T. B. Nikitina ◽  
I. V. Bovdui ◽  
V. V. Kolomiets ◽  
B. B. Kobylianskiy
Keyword(s):  
Magnetic Field ◽  
Computer Simulation ◽  
Magnetic Flux ◽  
Flux Density ◽  
Experimental Research ◽  
Magnetic Flux Density ◽  
Phase Conductors ◽  
Overhead Power Lines ◽  
Active Shielding ◽  
Storey Building

Aim. Reducing of magnetic flux density of magnetic field in multi-storey building, generated by overhead power lines to the sanitary standards level by active shielding means. The tasks of the work are the synthesis, computer simulation and experimental research of three-circuits system of active shielding, which includes three shielding coils. Methodology. When synthesizing the system of active shielding of magnetic field, are determined their number, configuration, spatial arrangement and of shielding coils as well as the shielding coils currents and resulting magnetic flux density value in the shielding space. The synthesis is based on the multi-criteria game decision, in which the payoff vector is calculated on the basis on quasi-stationary approximation solutions of the Maxwell equations. The game decision is based on the stochastic particles multiswarm optimization algorithms. Results. Computer simulation and experimental research of three-circuit system of active shielding of magnetic field, generated by overhead power lines with phase conductors triangle arrangements in multi-storey building are given. The possibility of initial magnetic flux density level reducing in multi-storey building to the sanitary standards level is shown. Originality. For the first time to reducing of magnetic flux density of magnetic field in multi-storey building the synthesis, computer simulation and experimental research of three-circuit system of active shielding of magnetic field generated by single-circuit overhead power line with phase conductors triangular arrangements carried out. Practical value. Practical recommendations from the point of view of the practical implementation on reasonable choice of the spatial arrangement of three shielding coils of three-circuit system of active shielding of the magnetic field generated by single-circuit overhead power line with phase conductors triangular arrangements in multi-storey building are given.

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