scholarly journals Health-Related Electromagnetic Field Assessment in the Proximity of High Voltage Power Equipment

2019 ◽  
Vol 10 (1) ◽  
pp. 260
Author(s):  
Mihaela Frigura-Iliasa ◽  
Felicia Ioana Baloi ◽  
Flaviu Mihai Frigura-Iliasa ◽  
Attila Simo ◽  
Sorin Musuroi ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
High Voltage ◽  
Low Frequency ◽  
Magnetic Flux Density ◽  
Health Issues ◽  
Protective Measures ◽  
Electrical Field Strength ◽  
Overhead Lines ◽  
Field Assessment ◽  
Health Related

With respect to health issues, this paperpresents the results of an electromagnetic field (EMF) assessment in the proximity of a high voltage power station located in South Transylvania, Romania. The main parameters taken into account are, according to all standards and recommendations, the RMS (Root Mean Square) value of low frequency (0–300 Hz) electrical field strength E (in kV/m) and magnetic flux density B (in µT). Measurements were performed near all critical pieces of equipment (transformers, switches, busbars, overhead lines), according to the EMF European Directive. Some measurements were made as a function of distance from the HV (high-voltage) equipment, others as a time variation. The main objective was to verify that specific limits are met and, if necessary, to identify protective measures. Finally, safe exposure times for personnel operating at these sites were determined. In the future, detailed maps of EMF variations will be made available to the power companies.

scholarly journals Biological Effects of a Low-Frequency Electromagnetic Field on Yeast Cells of the Genus Saccharomyces Cerevisiae

2021 ◽  
Vol 21 (2) ◽  
pp. 34-41
Author(s):  
K Sladicekova ◽  
M Bereta ◽  
J Misek ◽  
D Parizek ◽  
J Jakus
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Electromagnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Biological Effects ◽  
Low Frequency ◽  
Growth Dynamics ◽  
Yeast Cells ◽  
Magnetic Flux Density ◽  
Time Points

Abstract Background: Although the scientific community is extensively concerned with the effects of the EMF, the unambiguous explanation of its effects on living structures is still lacking. Goals: The goal of the study was to evaluate the effect of a low-frequency (LF) electromagnetic field (EMF) on the growth and multiplication of the yeast Saccharomyces cerevisiae. Methods: Yeast cells were exposed to a frequency of 900 Hz and a magnetic flux density of 2.3 mT. The duration of each experiment was 8 hours, in the beginning of the measurement the value of frequency, rms (root mean square) value of electric current (2 A), and magnetic flux density were fixed set on the exposure device. A paired experiment was performed, a sample exposed to EMF, and a sample shielded from the field. Subsequently, samples were taken every two hours, the number of cells was recorded, and then the concentration of the yeast cells was evaluated at time points. The time points reflected the exposure time of the samples exposed to EMF. Results: The results indicate that LF EMF at given parameters has an inhibitory effect on the growth and multiplication of yeast cells. Conclusion: Exposure to EMF can cause the differences in growth dynamics between cells exposed to the field and the unexposed ones.

scholarly journals Effect of extremely low frequency electromagnetic field exposure on sleep quality in high voltage substations

2012 ◽  
Vol 9 (1) ◽  
Author(s):  
Tayebeh Barsam ◽  
Mohammad Reza Monazzam ◽  
Ali Akbar Haghdoost ◽  
Mohammad Reza Ghotbi ◽  
Somayeh Farhang Dehghan
Keyword(s):  
Electromagnetic Field ◽  
Sleep Quality ◽  
High Voltage ◽  
Low Frequency ◽  
Field Exposure ◽  
Extremely Low Frequency

scholarly journals Analysis of the Torsional Stability of Split Phases

2019 ◽  
Vol 62 (6) ◽  
pp. 503-513
Author(s):  
I. I. Sergey ◽  
Y. G. Panamarenka ◽  
Y. V. Potachits ◽  
N. A. Yudina
Keyword(s):  
High Voltage ◽  
Climatic Factors ◽  
Short Circuit ◽  
Low Frequency ◽  
Power Lines ◽  
Structural Elements ◽  
Stability Calculation ◽  
Overhead Lines ◽  
Torsional Stability ◽  
Overhead Power Lines

The specificity of overhead power lines is associated with the fact that the length of conductors between the supporting structures can reach tens of thousands of meters. Wires and their components are exposed to climatic factors, viz. wind, rain, ice, snow. As compared to other structural elements, conductors are of the highest flexibility and lowest rigidity, and, therefore, they are the most sensitive elements to these effects. Since the early fifties of the XX century, the increase in energy consumption has caused the construction of high and ultra-high voltage overhead lines with split phases. For these types of conductors, new forms of oscillations have been noticed in the areas between the struts, the essence of which is torqueing the split phase. As a result, there is a violation of the torsional stability of the phase: collision of wires in the middle of sub-span and friction of wires of stranded conductor against each other, which leads to damaging conductors and, as a consequence, to disruption of power supply to consumers. Almost any overhead lines may be subjected to oscillations of wires in the span under the influence of wind. One of the types of such mechanical oscillations is galloping, i. e. low-frequency oscillations of wires with an amplitude reaching the value of the boom of wire sagging, and, taking into account the possibility of elongation of the wire, even exceeding it. Fluctuations in the galloping can cause significant mechanical forces and last long enough to lead to the destruction of structural elements of power lines, viz. wires, insulators, fittings and even pillars. Due to the large amplitude of oscillations, conductors of neighboring phases can approach each other at an unacceptable distance, resulting in a short circuit. The boundary value problem of the torsional stability calculation of the split phase with a given multiplicity of splitting has been set and solved. The critical lengths of the sub-spans at which the stable violation of torsional stability is most likely have been determined. A computer program has been developed, which can be used in the design of high-voltage lines with split phase.

scholarly journals The electromagnetic field around a high voltage 400 KV electrical overhead lines and the influence on the biological systems

2005 ◽  
Vol 18 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Adrian Marincu ◽  
Marian Greconici ◽  
Sorin Musuroi
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
High Voltage ◽  
Biological Systems ◽  
Electric Strength ◽  
Experimental Measurements ◽  
Human Beings ◽  
Overhead Lines ◽  
Electric And Magnetic Field

In this paper the analytical calculus and the experimental measurements of the electric and magnetic field around a high voltage 400KV electrical overhead lines has been analyzed. There have been analyzed the possible influences of the electromagnetic field on the health of the human beings. The calculus has been done using the Mat Lab medium, the experimental measurements of the electric strength have been done using a spherical dipole.

Comparison of high- and low-frequency electromagnetic field analysis

1993 ◽  
Vol 3 (3) ◽  
pp. 363-371 ◽  
Author(s):  
A. Konrad ◽  
I. A. Tsukerman
Keyword(s):  
Electromagnetic Field ◽  
Low Frequency ◽  
Field Analysis
Sign in / Sign up

Export Citation Format

Share Document