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Wireless Energy Transfer
Lašo, Matej ; Paar, Martin (referee) ; Krbal, Michal (advisor)
The aim of this Bachelor's thesis is to give complex information about wireless energy transfer and its historical evolution. The thesis then continues with describing the devices that are using wireless energy transfer and the effects this method is having on human health and the ways protecting against its effects. The second part, concerning practical measurements, aims at measuring on special pads using the wireless transfer on which I have made all my calibrations and measuring of magnetic flux and efficiency of this transfer.
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Design of the morning sun simulator
Suský, Stanislav ; Krbal, Michal (referee) ; Štěpánek, Jaroslav (advisor)
This work deals with the introduction of the influence of electromagnetic radiation on circadian rhythms and their influence on the organism. The work describes circadian rhythms and their influence on the organism, the location and description of functions of important organs and the influence of electromagnetic radiation on these organs. There are described light sources and their influence on circadian rhythms.
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Electrical machines fault simulator
Krátký, Michal ; Krbal, Michal (referee) ; Šlezingr, Jan (advisor)
The goal of this bachelor’s thesis is the laboratory task focused on vibrodiagnostics of rotating electrical machines. The thesis is divided into theoretical and practical part. The theoretical part is made of information related to rotating electrical machine mainly its faults and technical diagnostics. Besides that the vibrodiagnostics is involved into the theoretical part as well. The practical part deals with the design of laboratory task focused on vibrodiagnostics of rotating electrical machines. There is shown how vibrations influence the machine during the operation. There is used asynchronous machine 1LA7080 and vibrometer MV-5L and noncontact tachometer UNI-T UT372 for this experiment. The second task is the starting current diagnostics. The starting current ofthe engine with the rotor asymmetry 1LA7080 and rotor symmetry 1LA7090 is going to be analyzed here. On these engines will be shown, how current flicks affectthe magnetic field of the engine in the air gap.
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Ecology in lighting
Špidlík, Jan ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
This bachelor’s thesis is focused on introduction to ecology in lighting technology. There are briefly described individual light sources and chemical substance used in the manufacture of components. For clarity is amount of toxic mercury in each light source displayed in well-arranged picture. Thesis is also focused on the influence of lighting technology in the environment and impact on the ecosystem. Closer look is made upon influence of mercury on environment and human life and also overall influence of mining metals and its devastating consequences for ecosystem. This work also deals with post processing of light sources by collective systems.
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Methods of ignition spark gaps
Pekárek, Dominik ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
This thesis deals with methods of spark gap ignition. The thesis describes spark gap ignition by external electrode, by Rogowski electrode and by lasers. Advantages and disadvantages of these methods are also discussed. In the final part of the thesis there is described experiment with high voltage spark gap.
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Efficiency of Converting Electric Energy to Light in Current Light Sources
Krbal, Michal ; Pavelka, Tomáš (referee) ; Baxant, Petr (advisor)
The goal of this diploma’s thesis is to inform about present development of light sources, new technologies and about achieved parameters of these light sources. The thesis is mainly directed to describe efficiency of transformation electric energy to light at single types of light sources. There are described the concrete technical parameters of sources quoted by manufacturers and the contructional solution of single types of light sources. There is created a graphic comparation of electrotechnical and light parameters of the light sources.
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Degradation of liquid insulators for high voltage
Komárek, Filip ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
This bachelor's thesis deals with measurement of liquid insulators. Mainly it deals with diagnostic tests of transformer oil. Diagnostic tests are needed to identify oil status and to determine the parameters of the oil. The status of the used oil determines its type of degradation and progress of degradation. For the determination of degradation it is necessary to know the composition of the essential oil, to determine how it has changed the structure of the oil and the oil did not contain before use. To determine the basic electrical properties of the oil are used in diagnostic tests such as dielectric strength and dissipation factor. This work is in addition to a summary of diagnostic tests observation of mineral oil with an unknown degree of degradation and behavior of impurities in mineral oil once the electric field.
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Tesla coil proposition for HV spark gap source
Siuda, Petr ; Krbal, Michal (referee) ; Dohnal, Petr (advisor)
Tato bakalářská práce se zabývá základním seznámením s Nikolou Teslou a s jeho vynálezem Teslova transformátoru a jeho využití v elektrochemické praxi. Práce je rozdělená do čtyř částí. V úvodní části je stručně shrnut život elektrotechnika Nikoly Tesly a rozebrána problematika Teslova transformátoru. Druhá část je zaměřena na možné druhy a buzení Teslova transformátoru, výběr nejvhodnější varianty pro návrh základních komponent polovodičově buzeného teslova transformátoru pro VN jiskrový zdroj. Ve třetí části je popsán návrh budícího obvodu a desky plošných spojů. Dále je zde popsána výroba jednotlivých komponent a jejich základní technická dokumentace. V poslední, čtvrté části je popsáno oživení, měření a odzkoušení funkčního vzorku.
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Diagnosis of high voltage capacitors for cascade voltage multiplier
Baev, Dmitriy ; Špinka, Jiří (referee) ; Krbal, Michal (advisor)
The main subject of the final thesis is to find a suitable method for measuring the partial discharge (PD) in the dielectric of high-voltage capacitor. In the theoretical part of my thesis contains from the mechanisms of origin and the harmful effects of partial discharge at high voltage insulation of capacitor. It describes the global galvanic method of partial discharge measurement, the principle of cascade voltage multiplier, its main components are high-voltage capacitor and diode, facilities quality measurement of capacitors for voltage multipliers, advantages and disadvantages and principles of HIPOTRONICS DDX-8003 with the pulse discrimination system. In the experimental part of the diploma thesis is familiar with the diagnostics of high – voltage capacitors by means of laboratory measurements on the electronic bridge and with the help of partial discharge measurement system. Design of suitable electrode arrangement is described which eliminates the influence of corona which makes it impossible to measure partial discharges and the dissipation factor (tg ). Analysis data from measurement and determination of quality level, eventual degradation of measured capacitors. The result of this project should be designed the methodology for finding of poor – quality capacitors in order to increase the reliability of the voltage multiplier.
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Thermal degradation of insulation materials from the cable industry
Kučera, Filip ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
The aim of this bachelor thesis is to get acquainted with the properties and parameters of insulation materials of various types (PVC, PE). Measure these properties with a Tettex 2830/2831. Perform a theoretical analysis of the aging of insulating materials and propose a procedure for the formation of thermal degradation. Finally, find out how the properties of insulating materials, electrical strength and mechanical properties change due to thermal degradation.
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