Image calculation of electromagnetic field from power lines above a dissipative ground

1985 ◽  
Vol 68 (4) ◽  
pp. 259-265 ◽  
Author(s):  
E. Alanen ◽  
I. V. Lindell
Keyword(s):  
Electromagnetic Field ◽  
Power Lines

Research on Frequency Electromagnetic Field of Parallel Transmission Line

2014 ◽  
Vol 986-987 ◽  
pp. 1992-1995
Author(s):  
Hong Ying Cao ◽  
Bo Tang ◽  
You Xian Peng ◽  
Yu Li ◽  
Bin Chen
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Transmission Line ◽  
Transmission Lines ◽  
The State ◽  
National Standards ◽  
Power Lines ◽  
Three Gorges ◽  
Parallel Transmission ◽  
Electric And Magnetic Field

At present the study mainly for frequency electromagnetic field which is based on a single transmission line meanwhile the value must be in line with the requirements of the workers in the country frequency electromagnetic field. However, for parallel transmission line the maximum of frequency electromagnetic field is still to meet the provisions of the state, therefore in this paper studied the parallel transmission lines. Taking the multiple parallel power lines of China Three Gorges University as an example, the values of electric and magnetic field are calculated and the electromagnetic field is measured based on National standards. Then, compare the measured value with theoretical value, verified the correctness of the superposition algorithm.

scholarly journals Sealing by soldering of microblock packages made of diamagnetic alloys using high-frequency heating

2018 ◽  
pp. 3-8
Author(s):  
V. L. Lanin ◽  
Yu. N. Grishchenko
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Penetration Depth ◽  
High Frequency ◽  
Skin Layer ◽  
Magnetic Core ◽  
Power Lines ◽  
Hf Heating ◽  
Field Penetration Depth ◽  
Field Penetration

The main difficulties of application of high-frequency (HF) heating for sealing by soldering of microblock packages made of aluminum alloys is the low efficiency of heating, long processing time and considerable heating of the internal electronic module while sealing. The purpose of this study was to use effectively the physical phenomena of HF heating in order to optimize the HF heating parameters of sealing by soldering using fusible solders of microwave microblock packages made of diamagnetic alloys. Effects of HF heating (superficial, proximity and concentration of power lines) of the electromagnetic field are applied to sealing using soldering of microwave microblock packages made of diamagnetic alloys. The optimized parameters of HF heating provide energy efficiency and productivity of sealing: frequency of the electromagnetic field and the inductor design. When soldering microelectronic devices containing electronic parts sensitive to the electric field component, the energy of electromagnetic field in the package should be significantly lower than the energy of elements degradation, in which case the skin layer reaches the field penetration depth which is equal to 4 package thickness values. In order to increase the HF heating efficiency, there should be a concentration of the inductor current on the package surface facing the inductor, which is done by using a ferrite magnetic core. Using a ferrite magnetic core inside the inductor concentrates tension of magnetic field due to concentration of power lines of magnetic field in 1,2-1,3 times. The optimal frequency range for HF soldering is 0,4—2,0 MHz when at electromagnetic field penetration depth into the material of the package equal to 4 thickness values of the skin layer, the field strength is 152 times weaker in comparison with the surface.

Study of the Shielding Ability of Mesh Metal Materials from the Electromagnetic Field of Industrial Frequency Power Lines in Urban Environments

2021 ◽  
Vol 25 (2) ◽  
pp. 28-33
Author(s):  
N.A. Litvinova ◽  
I.S. Kyrie
Keyword(s):  
Electromagnetic Field ◽  
Electric Field ◽  
Urban Environments ◽  
Residential Facilities ◽  
Power Lines ◽  
Iron Aluminum ◽  
Metal Materials ◽  
Shielding Material ◽  
Frequency Power ◽  
Industrial Frequency

The results of studies of the practice of use in the construction of residential facilities located next to power lines, mesh metal materials, which have the shielding ability On the example of mesh metal materials (iron, aluminum, copper) used as a shielding material together with the roof of a building and in external walls, indicators reflecting the effectiveness of electromagnetic shielding are obtained. Also, according to the results of the study, it was found that when shielding an electric field of industrial frequency, it is important to take into account not only the material from which the screen is made, but also its.

The architecture of integrated information environment for the automated designing air power lines with regard to electromagnetic safety

10.12737/2394 ◽  
2014 ◽  
Vol 6 (3) ◽  
pp. 58-60
Author(s):  
Фёдоров ◽  
D. Fedorov
Keyword(s):  
Electromagnetic Field ◽  
Automated Design ◽  
Information Environment ◽  
Power Lines ◽  
Air Power ◽  
Electric Component ◽  
Forest Belts ◽  
Database Program ◽  
Multi Level ◽  
Integrated Information

The paper describes the architecture of an integrated information environment for ensuring automated design of air power lines with the influence of natural screens in the form of multi-level forest belts on the distribution of the electric component of the electromagnetic field. Architek tour integrated information environment uses a database of MathLab and MathCd. Presents a picture of the architecture of integrated information environment, showing the interaction of the database program.

scholarly journals Nettfrekvente elektromagnetiske felt og helseeffekter

2009 ◽  
Vol 14 (2) ◽  
Author(s):  
Karl Gerhard Blaasaas ◽  
Tore Tynes
Keyword(s):  
Breast Cancer ◽  
Electromagnetic Field ◽  
Power Lines ◽  
Childhood Leukaemia ◽  
Font Size ◽  
Field Exposure ◽  
Increased Risk ◽  
Power Frequency ◽  
Meta Analyses ◽  
Lateral Sclerosis

<span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><font face="TimesNewRomanPSMT" size="2"><font face="TimesNewRomanPSMT" size="2"><p align="left">I denne artikkelen oppsummeres epidemiologisk kunnskap om mulige helseeffekter etter eksponering for nettfrekvente (50/60 Hz) elektromagnetiske felt. Vi har basert oss på et flertall av vitenskapelige arbeider publisert i perioden 2001-2004 og konklusjoner i rapporter og oversiktsartikler fra perioden før 2001. Det er ikke funnet noen etiologisk sammenheng mellom elektromagnetiske felt og kronisk sykdom. Man vet heller ikke sikkert hvilke egenskaper ved de elektromagnetiske feltene som eventuelt kan fremskaffe sykdom. Eventuell latenstid fra eksponering til sykdomsutvikling er også ukjent. Eksponering over 0,4</p></font></font></span><font face="TimesNewRomanPSMT" size="2"><p align="left"> </p></font></span><p align="left"><span style="font-size: x-small; font-family: Symbol;"><span style="font-size: x-small; font-family: Symbol;">m</span></span><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;">T fra kraftlinjer ser ut til å kunne gi en dobling i risikoen for barneleukemi, og basert på metaanalyser kan ikke resultatene avvises som tilfeldige funn. Holdepunktene for en slik sammenheng er likevel begrenset. Ved vokseneksponering har man i enkeltstudier observert risikoøkninger for brystkreft, leukemi, hjernesvulst og amyotrofisk lateralsklerose. Det er også gjort isolerte funn av abort blant kvinner eksponert under graviditeten. For alle disse endepunktene er funnene allikevel ikke tilstrekkelige til å trekke sikre konklusjoner om sammenheng med eksponering</span></span></p><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><font face="TimesNewRomanPSMT" size="2"><font face="TimesNewRomanPSMT" size="2"><p align="left">This review is based on epidemiologic literature in the period 2001-2004 and conclusions in reports and review articles before 2001, regarding power frequency (50/60 Hz) electromagnetic fields and health outcomes. Twotimes increased risks for childhood leukaemia have been observed among children exposed to magnetic fields above 0.4</p></font></font></span><font face="TimesNewRomanPSMT" size="2"><p align="left"> </p></font></span><p align="left"><span style="font-size: x-small; font-family: Symbol;"><span style="font-size: x-small; font-family: Symbol;">m</span></span><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;">T from power lines, and based on meta-analyses these results can not be regarded as chance alone. The evidence for an association is however, still limited. Increased risks of breast cancer, leukaemia, brain<p align="left">tumor and amyotrophic lateral sclerosis have been observed in isolated studies. Increased risk of spontaneous</p><p align="left">abortion among women exposed during pregnancy has also been reported. None of the observations for any of</p><p>these endpoints are, however, sufficient for any connection to electromagnetic field exposure.</p></span></span></p></span></span>

Calculation of Electromagnetic Field Produced by Mixed Overhead Power Lines

2019 ◽  
Author(s):  
Karolina Kasas-Lazetic ◽  
Gorana Mijatovic ◽  
Dejana Herceg ◽  
Nikola Djuric ◽  
Miroslav Prsa
Keyword(s):  
Electromagnetic Field ◽  
Power Lines ◽  
Overhead Power Lines
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