Estimating Sag and Wind-Induced Motion of Overhead Power Lines With Current and Magnetic-Flux Density Measurements

2017 ◽  
Vol 66 (5) ◽  
pp. 897-909 ◽  
Author(s):  
Arsalan Habib Khawaja ◽  
Qi Huang
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Power Lines ◽  
Magnetic Flux Density ◽  
Density Measurements ◽  
Induced Motion ◽  
Overhead Power Lines

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.

scholarly journals Reduction of Magnetic Flux Density of Parallel Overhead Power Lines by Optimization of Phase Wires Hanging Order

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Andrii Vitaliyovich Dymerets ◽  
Dmitro Anatoliyovich Revko ◽  
Oleksii Vasyliovich Krasnozhon ◽  
Andrii Vasiliovich Krasnozhon
Keyword(s):  
Magnetic Fields ◽  
Magnetic Flux ◽  
Flux Density ◽  
Low Frequency ◽  
Power Lines ◽  
Magnetic Flux Density ◽  
Safe Level ◽  
Electric And Magnetic Fields ◽  
Efficiency Comparison ◽  
Overhead Power Lines

Overhead power lines are one of the largest sources of the low-frequency magnetic fields. Such magnetic fields occur the harmful effects on human health and other biological objects. The current size of the security zones doesn’t provide a safe level of the magnetic flux density outside them. Therefore, the task of reducing the magnetic flux density value of the overhead power lines outside the security zone is urgent. Some overhead power lines have sections where two lines pass parallel to each other at a short distance. For such lines the method of phase wires hanging order optimization can be applied. For efficiency comparison of different hanging orders was chose two types of electricity pylons: portal (PB330-7) and triangular (P330-3). The cases both lines done by the same pylons were investigated. Analyze of different hanging orders efficiency was performed by mathematical simulation using MATLAB software. The magnetic flux density computation inside the security zone and outside it was done by a specialized simplified methodology of power lines electric and magnetic fields calculation. It is shown that in case of identical phase wires hanging order and the same currents direction of two parallel lines there is a significant increasing of magnetic flux density value at the border of the security zone and outside it for both types of the electricity pylons. It is determined that with a certain hanging order it is possible to achieve a significant reduction of the magnetic flux density value. For lines with electricity pylons of a portal type (PB330-7) the most efficient is the mirror order. It allows to obtain a decreasing of magnetic flux density more than 30 percent at the security zone border and more than 50 percent outside it. For pylons of a triangle type (P330-3) the most efficient is the nonsymmetrical order. It provides the decreasing of magnetic flux density up to 20 percent. In case of opposite currents direction, the most efficient is the same hanging order for both types of electricity pylons. It is shown that optimal phase wires hanging order allows to decrease the magnetic flux density value outside the security zone border, to reduce the distance to border of the area with safe level of the magnetic flux density, to increase the phase current value at which the magnetic flux density value reaches the safe level within the security zone.

scholarly journals Magnetic flux density measurements from grain boundary phase in 0.1 at% Ga-doped Nd–Fe–B sintered magnet

2020 ◽  
Vol 178 ◽  
pp. 533-538 ◽  
Author(s):  
Youngji Cho ◽  
Taisuke Sasaki ◽  
Ken Harada ◽  
Atsuko Sato ◽  
Takehiro Tamaoka ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Magnetic Flux ◽  
Flux Density ◽  
Boundary Phase ◽  
Magnetic Flux Density ◽  
Sintered Magnet ◽  
Density Measurements

scholarly journals THE ENVIRONMENTAL HYGIENIC ASSESSMENT OF THE ELECTROMAGNETIC SITUATION NEAR SANITARY PROTECTION ZONE OF POWER LINES

2018 ◽  
Vol 97 (2) ◽  
pp. 132-137
Author(s):  
O. A. Grigoriev ◽  
Yu. D. Gubernskiy ◽  
V. A. Alekseeva ◽  
A. S. Prokofyeva ◽  
Mikhail E. Goshin
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
World Health ◽  
Power Lines ◽  
Magnetic Flux Density ◽  
Residential Areas ◽  
Epidemiological Surveys ◽  
Under Construction ◽  
The Impact

The article gives the review of criteria for the assessment of an electromagnetic situation near power lines. Settlement modeling has been executed and the actual data is characterizing a condition of the electric and magnetic field in the territory near power lines of 500 kV and 220 kV. The research of the impact of the power-frequency magnetic field from power lines in the apartments on the example of the building under construction located at distance of 60 m from the power line of 500 kV is reported. Values of the magnetic flux density at the borders of sanitary-protective zones of power lines were shown to meet Russian sanitary standards. At the same time outside this zone to the adjacent residential areas, there was fixed the excess in the performance of the magnetic flux density according to the standards recommended by the World Health Organization (WHO). The measurement of the magnetic flux density on different floors of the building under construction has shown that the maxima, recognized at floors 4 and 5 (0.3 mT) are on the border of the range recommended by the WHO; in case of the recalculation of these values on a maximum load of the line an obvious excess of the indices recommended by the WHO is observed. Thus, the area of the residential development in modern conditions may actually be located in the strip residential areas with uncertain criteria of the safety assessment, respectively, the population living in such conditions, is a potential contingent for epidemiological surveys on the program of the international electromagnetic WHO project.

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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