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SARAJLIĆ, M., KITAK, P., SARAJLIĆ, N., PIHLER, J.
Electric Field Strength of the Medium Voltage Post Insulator with Different Number of Ribs
KOMUNALNA ENERGETIKA / POWER ENGINERING, 239
The paper describes the designing of a medium voltage post insulator. The insulator model was designed in Matlab software and calculations of the electric field were in Elefant software. The emphasis is on the external shape of the insulator. The paper presents examples of the insulator with different number of ribs and their influence on the insulator’s electric field strength.
SARAJLIĆ, M., PIHLER, J., RIBIČ, J., KITAK, P.
APPLICATION OF MAYR MODEL IN THE SIMULATION OF ELECTRIC ARC
KOMUNALNA ENERGETIKA / POWER ENGINERING, 23
The paper describes application of Mayr model in the simulation of electric arc. The Mayr simulation model is a part of the MATLAB – SIMULINK, where the simulations of an open electric were performed. The experimental part was performed in the ICEM laboratory at the circuit breaker and switch disconnectors. A comparative analysis has been made of simulation calculations and laboratory measurements.
STOPAR, K., PIHLER, J., KITAK, P.
MEASUREMENT OF ARC FURNACE ELECTRICAL PARAMETERS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 24
Electric-arc furnace is one of the most importance pieces of equipment in the liquid steel production. An electric arc furnace enables a plant to melt scrap as fast as possible with the maximum energy input. An electrical energy input depends on the secondary current and secondary voltage of the furnace transformer tap, influencing the electric-arc burning stability. Electric arc furnace should be driven as efficiently as possible. Therefore, we want to measure electrical parameters during operation of the electric arc furnace to obtain information on its behavior. A measurement of arc furnace electrical parameters is the subject of this article.
KITAK, P.
STEP VOLTAGE DETERMINING BY USING DIFFERENT PROGRAM TOOLS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 25
For the earth rod three processes of the potentials calculations on the ground surface are presented. On the base of potential difference the step voltage is determined. Theoretical calculation of potential distribution can be applied according some assumptions and simplifications. For complex earthing systems a software tool based on an analytical approach of solving the grounding systems can be used (e.g. WinIGS software tool). Third approach is based on a numerical process on finite elements method that enables more complex analysis of potential distribution on the surface and below the surface inhomogeneous earth. For this approach some measures will be shown which reduce the step voltage.
KITAK, P., PIHLER, J., l GLOTIĆ, A., HORVAT, D., ŠPELIČ, D., ŽALIK, B., TIČAR, I.
APPROACHES TO SPATIAL VISUALIZATION OF OVERHEAD LINES ELECTROMAGNETIC FIELD
KOMUNALNA ENERGETIKA / POWER ENGINERING, 17
This paper deals with the art of voxel visualization technique of electromagnetic radiation on the high voltage transmission line. Results are useful for the electrical engineering society, in education, for environmental agencies and other non-experts. Paper covers three main subjects, i.e. the numerical analysis of electromagnetic field by the finite element method, classical electromagnetic field presentation in postprocessor of numerical program tool and visualization of the electromagnetic field with the volume ray casting technique. In the last representation, for each pixel of the displayed image a ray of sight is shot into voxel space and intersection is calculated. This method enables the representation of results independently of the numerical program tools.
VORŠIČ, Ž., PIHLER, J., KITAK, P.
ENVIRONMENTAL IMPACT OF SEMIINSULATED CONDUCTORS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 18
For overhead power lines, there are increasingly used compact conductors with carbon core. If such a conductor is »incomplete« isolated, we get covered conductorm which is mechanically stronger and what is even more important, it is spatially less wasteful. Furthermore, because of the isolation the electric field strength is lower near such a conductor.
There is a design of a covered conductor given in this article, which we could install on the existing 220 kV columns and so increase the transmission capacity of the Slovenian electricity network. The integration of regular energy infrastructure is increasingly demanding, therefore we investigated the impact of such covered conductor for the highest voltage levels to the environment. We compared the analytical calculation of the electric field strength near the proposed covered conductor with the method of finite elements. The results were evaluated according to the regulation on electrictromagnetic radiation in the natural and living environment.
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