Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Josef Pihera"'
Autor:
Ondřej Kozák, Josef Pihera
Publikováno v:
Energies, Vol 14, Iss 9, p 2567 (2021)
The behaviour of partial discharge as consequences of an alternating current (AC) is already well defined. AC partial discharges have completely different behaviour, background physics and parameters than partial discharges (PD) under direct current
Externí odkaz:
https://doaj.org/article/6c69b2018159406f89759ce148123a8f
Publikováno v:
Advances in Electrical and Electronic Engineering, Vol 7, Iss 3, Pp 432-436 (2008)
Modern power electric drives brought advantages in induction motor control. In the same time appeared problems with high frequency square waveform voltage (pulse stress) produced by the voltage converters. Voltage converters produce repetitive pulses
Externí odkaz:
https://doaj.org/article/3716be26b8054bc2bc1aa19e43c66705
Partial discharges suppression in slot part of rotating machines is an issue to be solved using the different attempts. Since decades the conductive layers of main wall slot insulation are used. Besides their resistivity / conductivity which allows p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f2a2b45c800fdfad74532d20955b4ef
http://hdl.handle.net/11025/50542
http://hdl.handle.net/11025/50542
Publikováno v:
2021 IEEE Electrical Insulation Conference (EIC).
Composites with the epoxy matrix are still the most common composites used in high voltage electrical insulation systems. Polyimides are materials with excellent heat resistance and high electrical strength for application, where high overall enduran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84ef440a2e09b727572727ea50328ffc
https://doi.org/10.1109/eic49891.2021.9612336
https://doi.org/10.1109/eic49891.2021.9612336
Autor:
Josef Pihera, Ondřej Kozák
Publikováno v:
Energies, Vol 14, Iss 2567, p 2567 (2021)
Energies
Volume 14
Issue 9
Energies
Volume 14
Issue 9
The behaviour of partial discharge as consequences of an alternating current (AC) is already well defined. AC partial discharges have completely different behaviour, background physics and parameters than partial discharges (PD) under direct current
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f47d745d12b6677672bc11209d6ae8b0
https://www.mdpi.com/1996-1073/14/9/2567
https://www.mdpi.com/1996-1073/14/9/2567
Publikováno v:
2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
The aim of this article is to verify the possibility of using inductive coupling for the on-line measurement of partial discharges MV cables. At its principle, inductive coupling records partial discharges that cause current changes over this couplin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::863470256968ba72c0634427f72a8f82
https://doi.org/10.1109/diagnostika49114.2020.9214744
https://doi.org/10.1109/diagnostika49114.2020.9214744
Publikováno v:
2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
The breakdown phenomena and determination of dielectric strength is one of the essential topics in the field of insulating materials for high-voltage applications. In the case of basic thermosetting plastics, including epoxy resins, dielectric breakd
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::524385ef8b359892a61f9a839e9afd8d
https://doi.org/10.1109/diagnostika49114.2020.9214597
https://doi.org/10.1109/diagnostika49114.2020.9214597
Autor:
Josef Pihera, Pavel Prosr, Tereza Krejnicka, Petr Kadlec, Martin Hirman, Radek Polansky, Ondrej Musil, R. Pavlica, J. Komarek
Publikováno v:
2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
This paper is focused on the analysis of selected dielectric parameters stability under the conditions of selected accelerated climatic aging. This stability is analyzed for glass fiber reinforced composites with different thermosetting matrix suitab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::defd176695b5c65572d88c48e3db8d47
https://doi.org/10.1109/diagnostika49114.2020.9214665
https://doi.org/10.1109/diagnostika49114.2020.9214665
Autor:
Josef Pihera, Robert Albrecht, Jaroslav Hornak, Pavel Trnka, Oldrich Turecek, Jonas Nyberg, Kai Saksela, Ladislav Zuzjak
Publikováno v:
2020 IEEE 3rd International Conference on Dielectrics (ICD).
Problems related to PD activity within dielectric systems stressed by high voltage have been known for over a hundred years. This phenomenon over the years caused numerous fails of electric machinery and equipment. Therefore, the detection of the pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42b49d5712dfc6c82142470335312039
https://doi.org/10.1109/icd46958.2020.9341902
https://doi.org/10.1109/icd46958.2020.9341902
Publikováno v:
Composites Science and Technology. 163:96-104
The influence of electrospun nanofibres made from polyamide 6 (PA6) on the gas bubble size distribution by volume in fibre/thermoset-matrix systems cured without a vacuum was comprehensively studied via various methods. An analysis of the microstruct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::039441d44cd06de85493628802f49387
https://doi.org/10.1016/j.compscitech.2018.05.019
https://doi.org/10.1016/j.compscitech.2018.05.019