@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: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}
}

@inproceedings{MTMT:33045590,
	title = {Aging and failure data supporting network usage tariff calculation},
	url = {https://m2.mtmt.hu/api/publication/33045590},
	author = {Cselkó, Richárd and Szabó, Dávid and Kálecz, György and Németh, Bálint},
	booktitle = {2022 IEEE Electrical Insulation Conference (EIC)},
	doi = {10.1109/EIC51169.2022.9833184},
	unique-id = {33045590},
	abstract = {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.},
	year = {2022},
	pages = {120-123},
	orcid-numbers = {Cselkó, Richárd/0000-0003-3145-1667; Szabó, Dávid/0000-0002-1689-0154; Kálecz, György/0000-0002-0921-6946}
}

@inproceedings{MTMT:33045545,
	title = {Condition Management of Low-Voltage Distribution Cables},
	url = {https://m2.mtmt.hu/api/publication/33045545},
	author = {Cselkó, Richárd and Balogh, Daniel and Kálecz, György and Németh, Bálint and Hartmann, Bálint},
	booktitle = {2022 IEEE Electrical Insulation Conference (EIC)},
	doi = {10.1109/EIC51169.2022.9833192},
	unique-id = {33045545},
	abstract = {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.},
	year = {2022},
	pages = {128-131},
	orcid-numbers = {Cselkó, Richárd/0000-0003-3145-1667; 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}
}

@{MTMT:32556140,
	title = {Különleges villámvédelmi kérdések},
	url = {https://m2.mtmt.hu/api/publication/32556140},
	author = {Kálecz, György and Tóth, Zoltán and Németh, Bálint},
	booktitle = {XI. Mechwart András Ifjúsági Találkozó (MAIT)},
	unique-id = {32556140},
	year = {2021},
	pages = {115-115},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946; Tóth, Zoltán/0000-0002-0429-0629}
}

@CONFERENCE{MTMT:32512233,
	title = {Cost-effective lightning protection of high-performance photovoltaic power plants},
	url = {https://m2.mtmt.hu/api/publication/32512233},
	author = {Kálecz, György and Tóth, Zoltán and Németh, Bálint and Kiss, István},
	booktitle = {22nd International Symposium on High Voltage Engineering},
	doi = {10.1049/icp.2022.0137},
	unique-id = {32512233},
	year = {2021},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946; Tóth, Zoltán/0000-0002-0429-0629}
}

@inproceedings{MTMT:32477531,
	title = {Zone-Based Lightning Protection Method for High-Performance Photovoltaic Power Plants},
	url = {https://m2.mtmt.hu/api/publication/32477531},
	author = {Kálecz, György and Tóth, Zoltán and Szedenik, Norbert and Németh, Bálint and Kiss, István},
	booktitle = {Proc. of 35th International Conference on Lightning Protection & XVI terminational Symposium on Lightning Protection},
	doi = {10.1109/ICLPandSIPDA54065.2021.9627397},
	unique-id = {32477531},
	abstract = {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.},
	keywords = {Lightning protection; PMAS; photovoltaic power plants; lightning protection zone concept},
	year = {2021},
	pages = {01-6},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946; Tóth, Zoltán/0000-0002-0429-0629}
}

@article{MTMT:32068450,
	title = {Nagyfeszültségű távvezetékek primer villámvédelme},
	url = {https://m2.mtmt.hu/api/publication/32068450},
	author = {Kálecz, György and Németh, Bálint},
	journal-iso = {ELEKTROTECHNIKA},
	journal = {ELEKTROTECHNIKA},
	volume = {2021},
	unique-id = {32068450},
	issn = {0367-0708},
	year = {2021},
	pages = {24-26},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946}
}

@article{MTMT:31009237,
	title = {Épületinformatikával támogatott családi házak szekunder villámvédelmi kérdései},
	url = {https://m2.mtmt.hu/api/publication/31009237},
	author = {Kálecz, György and Tóth, Zoltán and Iváncsy, Tamás},
	journal-iso = {ELEKTROTECHNIKA},
	journal = {ELEKTROTECHNIKA},
	volume = {2021},
	unique-id = {31009237},
	issn = {0367-0708},
	year = {2021},
	pages = {27-28},
	orcid-numbers = {Kálecz, György/0000-0002-0921-6946; Tóth, Zoltán/0000-0002-0429-0629}
}