@article{MTMT:34589136,
	title = {Evaluation of electric field distortion at the Gaisberg Tower for continuing current measurements in lightning discharges},
	url = {https://m2.mtmt.hu/api/publication/34589136},
	author = {Kálecz, György and Kiss, István and Németh, Bálint},
	doi = {10.1088/1742-6596/2702/1/012003},
	journal-iso = {J PHYS CONF SER},
	journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES},
	volume = {2702},
	unique-id = {34589136},
	issn = {1742-6588},
	abstract = {Upward lightning requires a distinct approach compared to downward (cloud-to-ground) lightning. Some lightning strikes are triggered by objects on the ground itself. The occurrence of such strikes depends on various factors, including the object’s geometric dimensions, structure, relative location within its environment, as well as the distribution and location of electrical charges within the thundercloud. This phenomenon takes place more and more often due to the spread of wind farms and higher buildings. In this article, simulation and calculation is carried out regarding the Gaisberg Tower in Austria which is actively used as a measurement and research site for lightning purposes. A finite element simulation is carried out to assess the electric field characteristics in the geometry. The close electric field measurement instruments are located 170 m away from the tower on an enclosure which must be considered during data analysis. The result of the created model is validated by former measurement data which confirms the arrangement of the model and creates the opportunity to directly transform the values of the electric field from the field mill to the tower during appropriate conditions.},
	keywords = {CLOUDS; Wind power; Lightning discharge; Lightning protection; Geometric dimensions; Towers; Wind farm; Cloud-to-ground lightning; Electrical charges; Lightning strikes; Electric field distortions; continuing current; Relative location; Upward lightning},
	year = {2024},
	eissn = {1742-6596},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946}
}

@article{MTMT:34581022,
	title = {Investigation of the separation of conductive and insulating objects on a laboratory made electrostatic separator},
	url = {https://m2.mtmt.hu/api/publication/34581022},
	author = {Székely, László and Kiss, István and Donghyeok, Gwak},
	doi = {10.1088/1742-6596/2702/1/012010},
	journal-iso = {J PHYS CONF SER},
	journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES},
	volume = {2702},
	unique-id = {34581022},
	issn = {1742-6588},
	abstract = {Electrostatic separators are widely used to separate conductive and insulating objects up to some millimetres in size. Modelling of such equipment has been presented in several studies; laboratory and numerical models have been analysed. However, there are such situations, where larger samples of the order of centimetres have to be separated, as milling them into smaller size particles is not allowed or feasible. It was found that electrostatic separation can be used even in such cases but in a different arrangement than in the "traditional"constructions. This paper is a continuation of a previous study, in which the separation of a constructed laboratory separator was examined. The model was built in a circular plate arrangement with high voltage needle electrodes above the edge of cylinder's mantle, where the discharges are generated. The slope of the circular plate is steadily decreasing, so the samples on the edge of the plate produce an increasing angle of inclination along the circumference. Charged samples stick to the plate, uncharged ones fall off. Some key parameters as rotation speed, electrode distance, voltage level and position of ionizer electrodes were varied. © Published under licence by IOP Publishing Ltd.},
	keywords = {Electrodes; Electric discharges; Separators; Voltage levels; Circular plates; electrostatic separation; Rotation speed; Electrode distances; Keys parameters; High-voltage needle; Needle electrodes; Small size particles; Traditional constructions},
	year = {2024},
	eissn = {1742-6596}
}

@article{MTMT:34013072,
	title = {Comparison of Collection Efficiency of ESP in a Numerical Model Using One and Multiple Independent Power Supplies},
	url = {https://m2.mtmt.hu/api/publication/34013072},
	author = {Székely, László and Kiss, István},
	doi = {10.3311/PPee.22492},
	journal-iso = {PERIOD POLYTECH ELECTR ENG COMP SCI},
	journal = {PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING AND COMPUTER SCIENCE},
	volume = {68},
	unique-id = {34013072},
	issn = {2064-5260},
	year = {2024},
	eissn = {2064-5279},
	pages = {21-26}
}

@inproceedings{MTMT:34719414,
	title = {Biodegradability Testing of Transformer Oils: Review},
	url = {https://m2.mtmt.hu/api/publication/34719414},
	author = {Abualasal, Ahmad and Kiss, István},
	booktitle = {2023 IEEE 6th International Conference and Workshop Óbuda on Electrical and Power Engineering (CANDO-EPE)},
	doi = {10.1109/CANDO-EPE60507.2023.10418015},
	unique-id = {34719414},
	abstract = {Numerous investigations are being carried out to further examine the features of the ester fluids because of their impressive performance as an alternative to traditional mineral oils in the power transformer. Given that these materials can be used in so many industrial equipment, not to mention the power transformer, environmental impact was a key research focus. Several techniques for evaluating the biodegradability of ester fluids used in electrical transformers have been illustrated in this paper, providing information about their potential as greener substitutes for traditional mineral oil-based insulating fluids. Ester fluids, particularly those made from vegetable oils, have become more popular because of their improved biodegradability and less environmental impact. As a result, the case of interest concerned the methods and rates of ester fluid biodegradation in various environmental settings as well as the impact of ester fluid type on biodegradability. This review emphasizes the necessity for continued research to improve the formulations and environmental management techniques of ester fluids used in transformer applications because of their biodegradability. This is important for developing sustainable power distribution systems. © 2023 IEEE.},
	keywords = {ESTERS; PERFORMANCE; HYDROCARBONS; BIODEGRADATION; Environmental impact; biodegradability; biodegradability; environmental management; Industrial research; Electric power distribution; ecotoxicity; ecotoxicity; Power transformers; Mineral oils; Electric transformer testing; Oil filled transformers; Insulating fluid; Research focus; ester oil; ester oil; Industrial equipment; Management techniques; Oil based; Biodegradability testing; Electrical transformers},
	year = {2023},
	pages = {213-216}
}

@inproceedings{MTMT:34719411,
	title = {Measurement of Complex Dielectric Constant of Transformer Oils Using HF Spectrum and Short-Circuited Coaxial Cable},
	url = {https://m2.mtmt.hu/api/publication/34719411},
	author = {Abualasal, Ahmad and Kiss, István},
	booktitle = {2023 IEEE 6th International Conference and Workshop Óbuda on Electrical and Power Engineering (CANDO-EPE)},
	doi = {10.1109/CANDO-EPE60507.2023.10418033},
	unique-id = {34719411},
	abstract = {Power transformer insulation has been getting a wide interest ever since this technology was put in service. Until these days many studies to develop the transformer insulation are being held. The purpose of this study is to investigate the dielectric constant of some liquids that can be used as an insulation material either specifically for the power transformer or for other applications using the high frequency and vector network analyzer device. Applying the test material as a dielectric in a model that simulates the coaxial cable design, the dielectric constant was measured using the reflected wave spectrum of a short-circuited coaxial line. As this is a new method of measurement; the results were compared with the actual complex dielectric constant values for each liquid to evaluate the accuracy of the experiment and check if there a chance of improvement. Further studies can be carried using this method which opens the way to further study the dielectric properties of different materials. © 2023 IEEE.},
	keywords = {ESTERS; complex networks; complex dielectric constant; insulation; dielectric liquids; permittivity; Insulation materials; High frequency HF; Short circuit; Measurements of; Power transformers; coaxial cables; Electric network analyzers; Dielectric permittivities; Oil filled transformers; Insulating oil; Dielectric permittivity; Coaxial cable; Timing circuits; Power transformer insulation; Spectra's; Vector-network analyzers; ester liquids; Ester liquid},
	year = {2023},
	pages = {207-212}
}

@inproceedings{MTMT:34554397,
	title = {LABORATORY-SIZE ESP EXAMINATION USING DC AND AC POWER SUPPLY},
	url = {https://m2.mtmt.hu/api/publication/34554397},
	author = {Székely, László and Kiss, István},
	booktitle = {2023 AEE World Energy Conference and Expo},
	unique-id = {34554397},
	abstract = {There are case studies and research results on the technology for many industrial electrostatic precipitators (ESP), as well as ESPs built in laboratories where a single parameter is being investigated. Like laboratory-scale ESPs, household-sized ESPs already exist but have not yet been widely used in practice. One reason for this may be that high voltage AC/DC converters and power electronics are expensive and not worth the investment. In our research, we tested a laboratory-size ESP with AC and DC power supply, intending to see how the efficiency of the separator changes when the DC HV rectifier is omitted. During the measurements, current-voltage characteristics were recorded and by keeping the voltage constant below the breakdown voltage, the separation was also investigated. The results did not show significant differences between the two supplies mode in the case of the examined construction. © 2023 AEE World Energy Conference and Expo.},
	keywords = {research results; Laboratories; Investments; Industrial research; Electric rectifiers; Current voltage characteristics; Rectifying circuits; current-voltage characteristics; Case-studies; DC converter; Power-electronics; Single parameter; High-voltages; Laboratory size; AC power supplies; Dc power supply},
	year = {2023}
}

@inproceedings{MTMT:34012957,
	title = {Investigating the reliability of needle-plane experiments with dust layer},
	url = {https://m2.mtmt.hu/api/publication/34012957},
	author = {Székely, László and Kiss, István and Cselkó, Richárd},
	booktitle = {Proceedings of the 16th International Conference on Electrostatic Precipitation},
	doi = {10.1007/978-3-031-34526-5_18},
	unique-id = {34012957},
	year = {2023},
	pages = {227-233}
}

@article{MTMT:33864866,
	title = {Szélerőmű és villámvédelmi felfogó?},
	url = {https://m2.mtmt.hu/api/publication/33864866},
	author = {Kálecz, György and Kiss, István and Németh, Bálint},
	journal-iso = {ELEKTROTECHNIKA},
	journal = {ELEKTROTECHNIKA},
	volume = {2023},
	unique-id = {33864866},
	issn = {0367-0708},
	year = {2023},
	pages = {8-10},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946}
}

@article{MTMT:32787321,
	title = {Theory behind the Zone Concept for External Lightning Protection of Photovoltaic Power Plants},
	url = {https://m2.mtmt.hu/api/publication/32787321},
	author = {Kálecz, György and Tóth, Zoltán and Kiss, István and Németh, Bálint},
	doi = {10.1016/j.epsr.2022.108025},
	journal-iso = {ELECTR POW SYST RES},
	journal = {ELECTRIC POWER SYSTEMS RESEARCH},
	volume = {209},
	unique-id = {32787321},
	issn = {0378-7796},
	year = {2022},
	eissn = {1873-2046},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946; Tóth, Zoltán/0000-0002-0429-0629}
}

@inproceedings{MTMT:32685193,
	title = {Examination of voltage-current characteristics of corona discharge in an electrostatic precipitator in case of significant dust space charge},
	url = {https://m2.mtmt.hu/api/publication/32685193},
	author = {Kiss, István and Székely, László and Cselkó, Richárd},
	booktitle = {2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)},
	doi = {10.1109/CEIDP50766.2021.9705458},
	unique-id = {32685193},
	year = {2021},
	pages = {303-306}
}