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Arc Fault Detection
Fendrychová, Michaela ; Chumak,, Oleksiy (oponent) ; Orságová, Jaroslava (vedoucí práce)
The thesis aims to analyze arc faults in the time, frequency, and mixed time-frequency domains in order to identify methods suitable for the detection arc faults in both AC and DC systems. Current standards in the field of arc fault detection are briefly introduced. Standardized tests according to the IEC 62606:2013 and UL 1699B have been performed to acquire arc fault signal data. Due to the insufficiency of the present standardized testing methods, a novel arc ignition technique based on springed wire is introduced. The obtained data have been analyzed in the time, frequency, and mixed time-frequency domains using the FFT, SFTF, and Wavelet transform. Based on the performed survey of published detection methods and considering the findings, observations, and experience generated during the performed signal analyzes, a detection method applicable in both the AC and DC systems and exploiting the Wavelet transform is proposed.
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Arc Fault Detection
Fendrychová, Michaela ; Chumak,, Oleksiy (oponent) ; Orságová, Jaroslava (vedoucí práce)
The thesis aims to analyze arc faults in the time, frequency, and mixed time-frequency domains in order to identify methods suitable for the detection arc faults in both AC and DC systems. Current standards in the field of arc fault detection are briefly introduced. Standardized tests according to the IEC 62606:2013 and UL 1699B have been performed to acquire arc fault signal data. Due to the insufficiency of the present standardized testing methods, a novel arc ignition technique based on springed wire is introduced. The obtained data have been analyzed in the time, frequency, and mixed time-frequency domains using the FFT, SFTF, and Wavelet transform. Based on the performed survey of published detection methods and considering the findings, observations, and experience generated during the performed signal analyzes, a detection method applicable in both the AC and DC systems and exploiting the Wavelet transform is proposed.
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Characterization of fluctuating discharge
Chumak, Oleksiy ; Hrabovský, Milan
A digital camera coupled with computer has a great potential in an analysis of discharges structures. This work analyzes an approach to visualization of dynamic radiant object. Mapping of brightness uncertainty values is used to show regions of different fluctuation intensity of radiation. The entropy as described by information theory was used as a relevant parameter for an uncertainty value. By a mathematical procedure a relative parameter based on the entropy was evaluated. As result an effects of optics sensitivity or of imperfections of experimental set-up were significantly suppressed.
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Thermal Plasma Assisted Gasification of Polymers
Sforza, T. ; Charlier, C. ; Hrabovský, Milan ; Chumak, Oleksiy
Gasification of various hydrocarbons with help of thermal plasma is studied at the Institute of Plasma Physics. Such treatment can be way of recycling of polymer waste with production of high purity synthesis gas (syngas) mainly composed of hydrogen and CO. A plasma torch with hybrid stabilization of arc used in the reactor allows higher efficiency for gasification than other processes. This work is preparation of the experiment for gasification of PET. Basic description and analysis of the gasification reactor is done. Analysis of reaction taking place is made. On the base of derived information optimal composition flow rates and power balance of the process is calculated.
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Inicializace elektrického oblouku v argonu proudícím přes vodní kanál
Chumak, Oleksiy ; Hrabovský, Milan ; Sforza, T. ; Falier, J.
Inicializace elektrického oblouku v dlouhém plynovém kanálu přes vodní objem je komplikovaná úloha. Je to ale nezbytné pro provoz plazmatronu z hybridní stabilizací oblouku. Proces inicializace byl rozdělen do několika etap: vývoj pilotního oblouku v argonové komoře, šíření ionizovaného argonu přes kanál ve vodním víru, spojení katody a anody vodivým kanálem a vývoj samostatného oblouku mezi katodou a anodou. Výzkum tohoto procesu v různých fázích je předmětem této práce.
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