TY - JOUR AU - Kálecz, György AU - Kiss, István AU - Németh, Bálint TI - Evaluation of electric field distortion at the Gaisberg Tower for continuing current measurements in lightning discharges JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2702 PY - 2024 PG - 9 SN - 1742-6588 DO - 10.1088/1742-6596/2702/1/012003 UR - https://m2.mtmt.hu/api/publication/34589136 ID - 34589136 N1 - Ossila Conference code: 197237 Export Date: 4 March 2024 Funding details: H2020 Euratom, 900014 Funding text 1: This research has received funding from the Euratom research and training programme under grant agreement N° 900014. AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Székely, László AU - Kiss, István AU - Donghyeok, Gwak TI - Investigation of the separation of conductive and insulating objects on a laboratory made electrostatic separator JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2702 PY - 2024 SN - 1742-6588 DO - 10.1088/1742-6596/2702/1/012010 UR - https://m2.mtmt.hu/api/publication/34581022 ID - 34581022 N1 - Export Date: 18 March 2024 Correspondence Address: Kiss, I.; Budapest University of Technology and Economics, Hungary; email: kiss.istvan@vet.bme.hu AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Székely, László AU - Kiss, István TI - Comparison of Collection Efficiency of ESP in a Numerical Model Using One and Multiple Independent Power Supplies JF - PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING AND COMPUTER SCIENCE J2 - PERIOD POLYTECH ELECTR ENG COMP SCI VL - 68 PY - 2024 IS - 1 SP - 21 EP - 26 PG - 6 SN - 2064-5260 DO - 10.3311/PPee.22492 UR - https://m2.mtmt.hu/api/publication/34013072 ID - 34013072 N1 - Export Date: 19 February 2024 Correspondence Address: Székely, L.; Department of Electric Power Engineering, Műegyetem rkp. 3., Hungary; email: szekely.laszlo@vet.bme.hu LA - English DB - MTMT ER - TY - CHAP AU - Abualasal, Ahmad AU - Kiss, István TI - Biodegradability Testing of Transformer Oils: Review T2 - 2023 IEEE 6th International Conference and Workshop Óbuda on Electrical and Power Engineering (CANDO-EPE) PB - IEEE CY - Danvers (MA) SN - 9798350328751 T3 - Proceedings of International Conference and Workshop Óbuda on Electrical and Power Engineering, ISSN 2831-4492 PY - 2023 SP - 213 EP - 216 PG - 4 DO - 10.1109/CANDO-EPE60507.2023.10418015 UR - https://m2.mtmt.hu/api/publication/34719414 ID - 34719414 N1 - IEEE Hungary Section Conference code: 197115 Export Date: 4 March 2024 AB - 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. LA - English DB - MTMT ER - TY - CHAP AU - Abualasal, Ahmad AU - Kiss, István TI - Measurement of Complex Dielectric Constant of Transformer Oils Using HF Spectrum and Short-Circuited Coaxial Cable T2 - 2023 IEEE 6th International Conference and Workshop Óbuda on Electrical and Power Engineering (CANDO-EPE) PB - IEEE CY - Danvers (MA) SN - 9798350328751 T3 - Proceedings of International Conference and Workshop Óbuda on Electrical and Power Engineering, ISSN 2831-4492 PY - 2023 SP - 207 EP - 212 PG - 6 DO - 10.1109/CANDO-EPE60507.2023.10418033 UR - https://m2.mtmt.hu/api/publication/34719411 ID - 34719411 N1 - IEEE Hungary Section Conference code: 197115 Export Date: 4 March 2024 AB - 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. LA - English DB - MTMT ER - TY - CHAP AU - Székely, László AU - Kiss, István ED - Association, of Energy Engineers TI - LABORATORY-SIZE ESP EXAMINATION USING DC AND AC POWER SUPPLY T2 - 2023 AEE World Energy Conference and Expo PB - Curran Associates CY - Red Hook (NY) SN - 9781713883937 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34554397 ID - 34554397 N1 - Conference code: 195760 Export Date: 2 February 2024 Correspondence Address: Székely, L.; Budapest University of Technology and Economics, Hungary; email: szekely.laszlo@vet.bme.hu AB - 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. LA - English DB - MTMT ER - TY - CHAP AU - Székely, László AU - Kiss, István AU - Cselkó, Richárd ED - Németh, Bálint TI - Investigating the reliability of needle-plane experiments with dust layer T2 - Proceedings of the 16th International Conference on Electrostatic Precipitation PB - Springer International Publishing CY - Cham SN - 9783031345289 T3 - Lecture Notes in Electrical Engineering, ISSN 1876-1100 ; 1052. PY - 2023 SP - 227 EP - 233 PG - 7 DO - 10.1007/978-3-031-34526-5_18 UR - https://m2.mtmt.hu/api/publication/34012957 ID - 34012957 N1 - Export Date: 19 October 2023 Correspondence Address: Székely, L.; Budapest University of Technology and EconomicsHungary; email: szekely.laszlo@vet.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Kálecz, György AU - Kiss, István AU - Németh, Bálint TI - Szélerőmű és villámvédelmi felfogó? JF - ELEKTROTECHNIKA J2 - ELEKTROTECHNIKA VL - 2023 PY - 2023 IS - 3-4 SP - 8 EP - 10 PG - 3 SN - 0367-0708 UR - https://m2.mtmt.hu/api/publication/33864866 ID - 33864866 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kálecz, György AU - Tóth, Zoltán AU - Kiss, István AU - Németh, Bálint TI - Theory behind the Zone Concept for External Lightning Protection of Photovoltaic Power Plants JF - ELECTRIC POWER SYSTEMS RESEARCH J2 - ELECTR POW SYST RES VL - 209 PY - 2022 SN - 0378-7796 DO - 10.1016/j.epsr.2022.108025 UR - https://m2.mtmt.hu/api/publication/32787321 ID - 32787321 N1 - Export Date: 19 May 2022 CODEN: EPSRD Correspondence Address: Kálecz, G.; Department of Electric Power Engineering, Hungary; email: kalecz.gyorgy@vet.bme.hu LA - English DB - MTMT ER - TY - CHAP AU - Kiss, István AU - Székely, László AU - Cselkó, Richárd TI - Examination of voltage-current characteristics of corona discharge in an electrostatic precipitator in case of significant dust space charge T2 - 2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) SN - 9781665419079 PY - 2021 SP - 303 EP - 306 PG - 4 DO - 10.1109/CEIDP50766.2021.9705458 UR - https://m2.mtmt.hu/api/publication/32685193 ID - 32685193 N1 - Scopus:hiba:85126033586 2022-10-12 16:52 befoglaló egyiknél nincsenek szerzők LA - English DB - MTMT ER -