Abstract
There could be areas near a high voltage power transmission lines where electric field strength can exceed maximum permissible values and could be harmful to workers. Territory of the open switch–gear with a metallic fence can be dangerous especially because the power line wires there are at a relatively low height. Therefore, it is important to know surely what the values of electric field strength are near a fence. The expressions for calculation of electric field strength at any observation point near the three-phase line with near the line set metallic fence dependently on the geometrical parameters of line and fence and the coordinates of observation point are presented in the paper. 2D approach is applied to implement the task. Values of electric field strength, obtained applying the analytical method, were compared with the numerically calculated ones. The comparison showed that difference between results obtained by analytical calculations and results obtained by numerical modelling is not greater than 10%. The results show that there is some area near the fence in which the electric field strength exceeds permissible values.DOI: http://dx.doi.org/10.5755/j01.eie.22.6.17218
Highlights
According to the Directive 2013/35/ES of the European Parliament and of the Council [1] workers can’t work in the workplaces where the effective value of 50 Hz alternating electric field exceeds 10 kV/m The admissible values of electric field depend on impact time and the field with value – 10 kV/m can act workers not more than 10 min according to Lithuanian standards [2]
We investigate the electric field near the metallic fence situated in neighbourhood of the high voltage line analytically and by modelling in this paper
Calculation technique of the electric field strength near the metallic fence situated under high voltage line is proposed
Summary
According to the Directive 2013/35/ES of the European Parliament and of the Council [1] workers can’t work in the workplaces where the effective value (rms) of 50 Hz alternating electric field exceeds 10 kV/m The admissible values of electric field depend on impact time and the field with value – 10 kV/m can act workers not more than 10 min according to Lithuanian standards [2]. The results of electric field distribution investigation in 330 kV open switch-gear are presented in [3]. There are some areas, in which electric field strength values exceed the limit established by Directive in 1,8 m height because the height of high voltage wires is reduced to 6,5 m in open switch-gear. The dangerous values of electric field may be near the grounded metallic installations. It is clear from the results that electric field could have greater values at the high voltage power lines. Territory of the open switch–gear is dangerous especially because the height of line wires there is low and electric field gains the greater values. We investigate the electric field near the metallic fence situated in neighbourhood of the high voltage line analytically and by modelling in this paper. We applied an assumption that electric field distributes without inertia in all investigation area
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