Additive Effect of Electric and Magnetic Fields on the Electrical Personnel

2021 ◽  
pp. 27-31
Author(s):  
K.B. Kuznetsov ◽  
◽  
A.R. Zakirova ◽  
Keyword(s):  
Magnetic Fields ◽  
Harmful Effect ◽  
Experimental Studies ◽  
Working Environment ◽  
Field Energy ◽  
Energy Characteristics ◽  
Industrial Enterprises ◽  
Electric And Magnetic Fields ◽  
Permissible Levels ◽  
Field Strengths

The article is devoted to the formation of a safe working environment at the industrial enterprises. Conducted experimental studies allowed to reveal not only the presence of electric and magnetic fields of 50 Hz, but also the spectrum of higher harmonic components at the workplaces of electrical personnel. Similar situation is observed in the electric (freight) alternating current locomotives of the railway transport. This is due to the specific features of electrical installations of two-pole and single-phase traction power supply. The important problem was solved related to the assessment of the additive effects of electric and magnetic fields with their simultaneous effect on the personnel. The new method is proposed for calculating and standardizing electric and magnetic fields of 50 Hz based on consideration of their dose energy characteristics at their simultaneous harmful effects on the personnel. The standardization is proposed to be carried out on the basis of the current maximum permissible levels of the parameters of 50 Hz electric and magnetic fields but in the form of the field energy characteristics based on the definition of the Poynting vector. The additivity of the effect of electric and magnetic fields on the personnel is proposed to be assessed by the additivity coefficient in the form of a quantitative measure of the combined harmful effect of the field strengths components. At the additive standardization of simultaneously two harmful factors of the electric and magnetic field strengths, the standardized indicators of magnetic and electric strengths required for assessing the total energy maximum safe level are reduced by 2 times. Based on the maximum permissible levels of electric and magnetic fields, a graph was built for the changes in the energy load of these fields versus the length of exposure. Technical device was developed that measures the level of energy load of the electric and magnetic fields. Using this device, it is possible to minimize the total effect of harmful factors on the electrical personnel with the help of protective means.

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

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.

49. Evaluation of Electric and Magnetic Fields Around an Induction Cap Sealer

1999 ◽  
Author(s):  
F. Rosenthal ◽  
M. Carter ◽  
S. Hampton ◽  
T. Mays
Keyword(s):  
Magnetic Fields ◽  
Electric And Magnetic Fields

Electric and magnetic fields at power frequencies

2010 ◽  
Vol 29 (Supplement 1) ◽  
pp. 69-83
Author(s):  
Anthony B. Miller ◽  
Lois M. Green
Keyword(s):  
Magnetic Fields ◽  
Electric And Magnetic Fields

Main approaches to prevention of health disorders in workers in contact with physical factors

2020 ◽  
Vol 60 (11) ◽  
pp. 827-829
Author(s):  
Andrey V. Melentyev
Keyword(s):  
Cardiovascular Risk ◽  
Cardiovascular Diseases ◽  
Machine Building ◽  
Working Environment ◽  
Physical Factors ◽  
Noise And Vibration ◽  
Industrial Enterprises ◽  
Increased Risk ◽  
Health Disorders ◽  
Building Enterprises

Introduction. One of the leading causes of occupational health loss, especially in mining and machine-building enterprises, is the combined impact of industrial noise and vibration. The wide prevalence of cardiovascular diseases is one of the most important medical and social problems, due to persistent disability and high mortality, bringing prevention of health disorders to the first place as the basis for preserving labor longevity. The aim of study is to identify the main approaches aimed at preventing health problems in workers who come into contact with vibration and noise at mining and machine-building enterprises. Materials and methods. A survey and survey of 296 industrial workers was conducted. Group 1 (160 people) included men who were exposed to noise and vibration factors above the maximum permissible levels, group 2 consisted of 136 men who did not have direct contact with noise and vibration generating equipment. When conducting an in-depth laboratory and instrumental examination in a hospital setting, all workers additionally calculated the level of cardiovascular risk on the SCORE scale. Statistical analysis was performed using the software package "Statistica 6.0". Results. It is determined that the priority adverse factors of the working environment in production are noise and vibration. It has been shown that individuals who come into contact with these factors are more likely to detect violations of lipid metabolism and endothelial function, have a higher average heart rate and systolic blood pressure, and have an increased risk of developing cardiovascular diseases. Conclusions. Taking into account the obtained results of the proposed diagnostic approaches aimed at the prevention of health disorders among workers of industrial enterprises. If employees are found to have an increased cardiovascular risk, it is necessary to conduct a more in-depth examination and timely medical and preventive measures.

Sign in / Sign up

Export Citation Format

Share Document