Michal Ivančák

Technical University of Košice

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Michal Kolcun

Technical University of Košice

ZČ

Zsolt Čonka

Technical University of Košice

Ján Zbojovský

Technical University of Košice

Dušan Medveď

Technical University of Košice

Maksym Oliinyk

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Marek Pavlík

Technical University of Košice

Juraj Kurimský

Technical University of Košice

György Morva

Obuda University

Roman Cimbala

Technical University of Košice

Martin Vojtek

University of Pardubice

Cooperative Institutions

Technical University of Košice

nLIGHT (United States)

Obuda University

University of Žilina

Institute of Experimental Physics of the Slovak Academy of Sciences

Slovak Academy of Sciences

Mylan (Switzerland)

Weatherford College

Rzeszów University of Technology

Poznań University of Technology

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The shielding effectiveness of building material – brick filled with mineral wool

Marek Pavlík Ján Zbojovský Lukas Kruzelak Michal Ivančák

initially, people were exposed to radiation originating from Earth and the cosmos, a rapid increase in artificial sources of electromagnetic radiation began at the end of the 20th century. This paper deals with research in electromagnetic shielding field. Experiment in this paper is focused on measurement of shielding effectiveness. Measured object was brick filled with mineral wool. Measurements were made for filled bricks with a thickness of 30 cm, 38 cm, 44 cm and 50 cm. The measurement shows that the shielding effectiveness increases with the increasing thickness of the material.

Mineral wool

Brick

10.1109/cando-epe.2018.8601158

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Citations (2)

New way in design of a power station earthing system

Stanislav Ilenin Zsolt Čonka Michal Ivančák Michal Kolcun György Morva

This article discusses the design of a power station earthing system using two methods that are compared to each other. The design was based on the software method using CYMGRID and the mathematical method based on IEEE 80-2000. The process in both methods is aimed at creating a grounding model, determining the overall resistance, overloading the cross-sections of the earthing switches and adhering to the limit values for the touch and step potential. The work compares these analyses and evaluates the differences in design and possible shortcomings, such as the possibility of over-dimensioning or underestimating the grounding system.

Dimensioning

Earthing system

Design process

10.1109/cando-epe.2018.8601127

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Breakdown Driven by Magnetic Field in Gradually Aged Ferrofluid

Acta Physica Polonica A (2020)

Juraj Kurimský Michal Rajňák Roman Cimbala Iraida Kolcunová Bystrík Dolník

This study deals with a specific problem of the impact of magnetic field on the breakdown voltage in gradually aged ferrofluid.The examination was conducted on the samples containing a certain volume of mineral oil with several volume concentrations of iron oxide superparamagnetic nanoscaled particles with surface modified by oleic acid.It is known that certain concentrations of particles in dielectrical insulating oil can improve its electrical withstanding capability.However, the improvement is related to specific operating conditions.In the context of the current research we report a more complex study where the external magnetic field was applied in breakdown voltage tests conducted with the ferrofluid thermally aged for three consecutive 200 h aging periods.The test fixture was designed for the experimental purpose.During the observation, the DC low-level external magnetic field was applied.The interaction of dispersed particles with external electric and magnetic field resulted in a change of the expected breakdown voltages.We present the breakdown voltage variations depending on two-parameters: the thermal aging and application of external magnetic field.The measurements are analyzed statistically.The ability of the particles to act as space charge accumulators at each stage of the experiment is proven.

Ferrofluid

10.12693/aphyspola.137.939

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Modelling microgrid as the basis for creating a smart grid model

PRZEGLĄD ELEKTROTECHNICZNY (2019)

Michal Ivančák

Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informujące swoich czytelników o najnowszych osiągnięciach naukowych i nowoczesnych rozwiązaniach technicznych w Polsce i na świecie, popularyzuje problemy techniczne oraz poszerza wiedzę i kulturę techniczną.

Microgrid

Basis (linear algebra)

10.15199/48.2019.08.11

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Citations (6)

The Impact of a Low-voltage Smart Grid on the Distribution System

Zsolt Čonka Michal Ivančák Maksym Oliinyk Dušan Medveď Michal Kolcun

This paper deals with the impact of a low voltage smart grid on the distribution system. The last European directives 2014/94 / EU, 2009/28/EC and 2010/31 / EU, bring new problems to solve for distribution system operators. The existing networks of distribution systems are not prepared to fulfill these criterions. Paper shows results related with application of this new directives on existing distribution systems.

Distribution grid

10.1109/epe.2019.8778177

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Reducing the Impact of Transient Phenomena of Arc Furnace on Power Network Operation

Dušan Medveď Zsolt Čonka Michal Kolcun Michal Ivančák Maksym Oliinyk

This paper deals with the analysis of the transient phenomena caused by the operation of the electric arc furnace in the 22 kV network, describes the causes of their origin and proposes the possibilities of their reduction with regard to the fulfillment of the quality of electric energy. In particular, it focuses on assessing the short-term flicker rate and the use of the STATCOM device to reduce it. The analysis and subsequent reducing of transient phenomena impact was realized by simulations using the Matlab / Simscape Power Systems tool. The obtained results were evaluated in accordance with the valid European standards and legislation of the Slovak Republic.

Transient (computer programming)

Electric arc furnace

Electric arc

10.1109/epe.2019.8778130

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FROM MODELLING MICROGRID TO CREATING SMART GRID

Acta Electrotechnica et Informatica (2019)

Michal Ivančák Juraj Kurimský Jakub Urbanský

Smart Grid or intelligent networks are the most frequently mentioned topic currently.We can say that research in this area is highly actual.This paper describes the impact of intelligent network elements on the part of a village or microgrid.The modell examines the effect of electric vehicle charging on the stability of distribution network operation.In addition to the chargers, the modell also features renewable sources, which are an inseparable part of the smart grid.

Microgrid

10.15546/aeei-2019-0021

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IMPACT OF ELECTRICAL POWER LOAD TIME MANAGEMENT AT SIZING AND COST OF HYBRID RENEWABLE POWER SYSTEM

Polish Journal of Management Studies (2017)

Miroslav Mikita Michal Kolcun Michal Špes Martin Vojtek Michal Ivančák

10.17512/pjms.2017.15.1.15

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Citations (12)

Analysis of day-ahead generation diagram in power network consisting of renewable energy sources

E3S Web of Conferences (2019)

Zsolt Čonka Dušan Medveď Michal Ivančák Michal Kolcun

This article deals with the analysis of a day-ahead generation diagram in specific part of a power network with renewable energy sources. As a renewable energy source a photovoltaic power plant was chosen. Input data for a day-ahead analysis was obtained from the database of previous measurement that was realised on the existing configuration in off-grid network at the department of authors. The simulation network was created in Matlab/Simscape Power System environment that consisted of rotating generators (for regulation of generated power due to fluctuated power generation from photovoltaic sources) and photovoltaic power plant of variable energy generation and loads. The results refer to a necessity to consider the previous measured data of the weather for prediction of future expectation of a day-ahead load diagram.

10.1051/e3sconf/20198401002

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Experimental Study of High Frequency Electromagnetic Field Penetration Through Building Material - Concrete Wall

Marek Pavlík Ján Zbojovský Maksym Oliinyk Michal Ivančák

Electromagnetic shielding has been enjoying greater attention recently. On one side, it is due to the electromagnetic compatibility of electric and electronic devices. On the other, it is because of the electromagnetic effect on living organisms, a human being included. We are constantly exposed to the electromagnetic field which is why it is important to raise this issue. The proposed contribution presents the results of research into the shielding of a construction object concrete towards the electromagnetic field. Shielding is defined as shielding effectiveness. Shielding effectiveness is defined by a product of reflection and absorption of the electromagnetic field. The experiment in this contribution concentrates on measurement of shielding effectiveness and reflection of the electromagnetic field. Measured object was concrete wall 120 mm thickness composed of cement and water. Based on these observables it is possible to calculate the electromagnetic absorption which is difficult to measure.

Electromagnetic Compatibility

Electromagnetic environment

Penetration (warfare)

Conducted electromagnetic interference

Electromagnetic pulse

Reflection

10.1109/epe.2019.8778183

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Citations (5)