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 - 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 - CHAP AU - Cselkó, Richárd AU - Szabó, Dávid AU - Kálecz, György AU - Németh, Bálint ED - IEEE, , TI - Aging and failure data supporting network usage tariff calculation T2 - 2022 IEEE Electrical Insulation Conference (EIC) PB - IEEE CY - Piscataway (NJ) SN - 9781665480239 T3 - Electrical Insulation Conference and Electrical Manufacturing Expo, ISSN 2334-0975 PY - 2022 SP - 120 EP - 123 PG - 4 DO - 10.1109/EIC51169.2022.9833184 UR - https://m2.mtmt.hu/api/publication/33045590 ID - 33045590 N1 - Export Date: 13 September 2022 Correspondence Address: Cselko, R.; Budapest University of Technology and Economics, Hungary; email: cselko.richard@vik.bme.hu AB - With the emergence of distributed and household power generation, the network usage tariffs based on the net energy consumption are becoming more and more unsuitable to express the real value of the service provided by the network operator. Assets are aging and are subjected to external overstresses even when in standby. Novel load patterns, e.g., due to electric vehicle charging, may cause accelerated aging.Accordingly, operators are seeking methods to calculate the real costs associated with asset aging and failures, which can be the basis of fair and realistic network usage tariffs. In this article, a methodology is proposed for such calculation for selected distribution network components. It considers standby aging, insulation life models and statistics of random failures and external overstresses for medium voltage buried cables, overhead line conductors and transformers.The method enables the estimation of the life consumption rate and other associated costs at any operational state, which can be the basis of tariff calculation. LA - English DB - MTMT ER - TY - CHAP AU - Cselkó, Richárd AU - Balogh, Daniel AU - Kálecz, György AU - Németh, Bálint AU - Hartmann, Bálint ED - IEEE, , TI - Condition Management of Low-Voltage Distribution Cables T2 - 2022 IEEE Electrical Insulation Conference (EIC) PB - IEEE CY - Piscataway (NJ) SN - 9781665480239 T3 - Electrical Insulation Conference and Electrical Manufacturing Expo, ISSN 2334-0975 PY - 2022 SP - 128 EP - 131 PG - 4 DO - 10.1109/EIC51169.2022.9833192 UR - https://m2.mtmt.hu/api/publication/33045545 ID - 33045545 N1 - Export Date: 13 September 2022 Correspondence Address: Cselko, R.; Budapest University of Technology and Economics, Hungary; email: cselko.richard@vik.bme.hu AB - Distribution grid operators face various challenges today. In general, many of the assets in the current grid are approaching the end of their design lifetime and it is feared that they will soon be unable to perform their tasks safely and reliably. Furthermore, there are major risks associated with the increasing penetration of electric vehicles and residential solar generation. This phenomenon is changing the load patterns seen so far, presumably causing the accelerated aging of cables. At the same time, as the cables are subjected to different mechanical, thermal and electrical stresses during their operation, the condition of each device may differ. Low-voltage cables are in most cases weakly documented and have been operated in the run-to-failure strategy due to the lack of interest and sufficient diagnostic methods. Though in the future, the available methods may be broader, in the current situation, the condition management needs to be solved based on scattered and inaccurate information. This paper describes the development of a condition management strategy to support maintaining a more reliable low-voltage power grid and to identify the most important degrading factors that require investigation. LA - English 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 - Kálecz, György AU - Tóth, Zoltán AU - Németh, Bálint ED - Mohos, András ED - Táczi, István ED - Tóth, Zoltán TI - Különleges villámvédelmi kérdések T2 - XI. Mechwart András Ifjúsági Találkozó (MAIT) PB - Magyar Elektrotechnikai Egyesület, Mechwart András Ifjúsági Társaság CY - Budapest SN - 9789639299436 PY - 2021 SP - 115 EP - 115 PG - 1 UR - https://m2.mtmt.hu/api/publication/32556140 ID - 32556140 LA - Hungarian DB - MTMT ER - TY - CONF AU - Kálecz, György AU - Tóth, Zoltán AU - Németh, Bálint AU - Kiss, István TI - Cost-effective lightning protection of high-performance photovoltaic power plants T2 - 22nd International Symposium on High Voltage Engineering C1 - Xi'an PY - 2021 PG - 4 DO - 10.1049/icp.2022.0137 UR - https://m2.mtmt.hu/api/publication/32512233 ID - 32512233 LA - English DB - MTMT ER - TY - CHAP AU - Kálecz, György AU - Tóth, Zoltán AU - Szedenik, Norbert AU - Németh, Bálint AU - Kiss, István TI - Zone-Based Lightning Protection Method for High-Performance Photovoltaic Power Plants T2 - Proc. of 35th International Conference on Lightning Protection & XVI terminational Symposium on Lightning Protection PB - IEEE SN - 9781665423465 PY - 2021 SP - 01 PG - 5 DO - 10.1109/ICLPandSIPDA54065.2021.9627397 UR - https://m2.mtmt.hu/api/publication/32477531 ID - 32477531 AB - n the name of sustainability, renewable energy production plays an increasing role in the electricity generation. With the spread of photovoltaic power plants, new challenges are emerging for experts to maintain grid stability due to their dependence of sunlight intensity. The fact, that power generation of these power plants can be unpredictable, must be considered. In addition, growing in numbers also means that the lightning protection of photovoltaic power plants is more and more important to ensure their energy generation during appropriate weather conditions. According to the standardized procedure, the lightning protection of these systems can be constructed. The paper indicates, the calculations strictly based on the standard are leading to a protection system that is not cost-efficient and – in most cases – elements of the primary protection system can be neglected without significantly lowering the protection level. In order to demonstrate a more efficient way to create primary protection, a real photovoltaic power plant is featured in this article. The method to examine the geometry and plan a more efficient primary lightning protection system is based on the PMAS theory. Different zones of the examined photovoltaic power plant are selected to present the calculation. LA - English DB - MTMT ER - TY - JOUR AU - Kálecz, György AU - Németh, Bálint TI - Nagyfeszültségű távvezetékek primer villámvédelme JF - ELEKTROTECHNIKA J2 - ELEKTROTECHNIKA VL - 2021 PY - 2021 IS - 3 SP - 24 EP - 26 PG - 3 SN - 0367-0708 UR - https://m2.mtmt.hu/api/publication/32068450 ID - 32068450 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kálecz, György AU - Tóth, Zoltán AU - Iváncsy, Tamás TI - Épületinformatikával támogatott családi házak szekunder villámvédelmi kérdései JF - ELEKTROTECHNIKA J2 - ELEKTROTECHNIKA VL - 2021 PY - 2021 IS - 1-2 SP - 27 EP - 28 PG - 2 SN - 0367-0708 UR - https://m2.mtmt.hu/api/publication/31009237 ID - 31009237 LA - Hungarian DB - MTMT ER -