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Induction heating for small applications
Hrbáč, Lukáš ; Foral, Štěpán (referee) ; Krbal, Michal (advisor)
This bachelor’s thesis covers the topic of induction heat and possible solutions for small applications. There is theoretical knowledge needed for design of an induction device and also principles of induction heat. In the thesis, there is described resonant circuit, which is the main part of induction heating device. Furthermore, usual interpretations of driver and power circuits are analyzed. This work describes different ways how to adjust operating frequency to achieve better results. This thesis also includes verification of functionality of such a device, measurement of operating parameters and efficiency. Instructions for laboratory exercise dealing with induction device are attached in the appendix.
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Testing of Surge Arresters
Jeřábek, Lukáš ; Paar, Martin (referee) ; Krbal, Michal (advisor)
This bachelor's thesis is devoted to metal oxide surge arresters. After historical and theoretical introduction, which explains their principles and describes their characteristical properties, analysis of the standard IEC 60099-4 and testing according to the standard with focus on the type tests follows. This chapter is also amended with review of the standard's imperfections and with its most probable future development. The work concludes with a market survey, a review of the largest manufacturers and a comparison of their products.
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Testing of MV Distribution Transformers
Czajtányi, Róbert ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The aim of this thesis was to get acquainted with the electrical properties of distribution transformers, which are used in the area of high voltage technology. Further aim was to describe the existing diagnostic methods according to the standards and to introduce the measuring workstation. Finally, the diagnostic of transformer was performed, and the results were evaluated.
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Design of Measuring and Recording System for 100 kV AC/DC Haefely KIT
Sirotsin, Aliaksandr ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
This bachelor thesis is devoted to the design of a measuring and recording system for a 100 kV construction KIT. It describes the Haefely KIT 100kV, reveals the analysis of the principle of the operation of the measuring instrument DMI 551 and the design of the measuring system. In addition to it this work presents the calculation of harmonic distortion, ripple, peak, mean and rms values from the measured data and their measurement. The practical part of the thesis is completed with verifying the individual functional parts of the measuring system, including calibration.
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Surge arresters testing
Chrástecký, Lukáš ; Krbal, Michal (referee) ; Toman, Petr (advisor)
This work deals with voltage surges in electrical grids, overvoltage protection and testing of surge arresters. The first part of thesis is focused on the issue of overvoltage impulses caused by different sources and their description. The next part of the thesis deals with surge arresters and it is focused on their classification, attributes and possible applications. The last part of the work describes standards and testing of surge arresters. Thesis includes a scheme of laboratory exercise for testing of a surge arresters.
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Effect of Light Source Position on Operating Parameters
Múdry, Peter ; Krbal, Michal (referee) ; Baxant, Petr (advisor)
The main task of this bachelor’s thesis is to find out, how does the working position of light source influence the lighting parameters of light source and possibly other closely related variables as temperature of light source etc. Purpose of this work is to measure luminous flux of some selected light sources’, where significant influence on luminous flux caused by working position of source can be expected and to process measured results. This work processes: lighting parameters of light sources’, theoretical information about influence of temperature and position on operating parameters of light sources, optimal working conditions of light sources and deals with electrical discharge in lightings.
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Light sources in extreme operational conditions
Martiš, Jan ; Krbal, Michal (referee) ; Pavelka, Tomáš (advisor)
The purpose of this work is to inform about how various external influences can affect the operational characteristics of light sources. In the first part of the work, the light sources are categorized based on their principle of operation and the basic parameters and properties of different light source types are listed. Then the individual influences (voltage changes, temperature, operational position) and their possible effect on the operational characteristics of different types of light sources are analysed. Further, possible procedures for measuring light sources under altered conditions are mentioned and the results of practical measurements on selected light sources are presented. The last part of the work deals with ways to decrease the influence of altered operating conditions on the operation of light sources.
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Fast Transient Phenomena in High Voltage
Vala, Martin ; Dohnal, Petr (referee) ; Krbal, Michal (advisor)
This work deals with research and description of the fast transients in high voltage technics. First part deals with division of fast transients and description of an impulse wave properties. Second part is focused on atmospheric overvoltage description and on direct and indirect lightning surge protection methods. Next, there are described the main characteristics and division of the surge protection devices in the work. In the next part, there are introduced some sort of high voltage generators, used for meassurement of impulse wave in a transmission line. In the last part there is stated an analysis of practical measurement of impulse weaves and surge arresters by using a Marx generator.
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Lighting design of pizzeria
Rotrekl, Matěj ; Krbal, Michal (referee) ; Škoda, Jan (advisor)
The thesis has been created and to be applied for the use of the object of Pizzeria restaurant in Moravský Písek. Within this thesis there was a literature search used focused on the lighting system design. The IT technology was used, especially the Relux and Vivaldi applications. The current condition of the lighting system in the object has been evaluated by using the manual measuring and the actual module within the Relux application. The current condition has been evaluated as truly insufficient for the kitchen related work environment. Moreover, in each room a relatively strong glare has been detected. The following step was to design a new lighting system that meets all the criteria set by Standard IEC 12464-1. The new lighting system provides visual comfort and accurate visual performance for the personnel working within this environment. The thesis also comes up with the suggestions of the dynamic lighting scenes, which have been created by using the Vivaldi application for each room. Given the parameters of the existing lighting system, the overall reconstruction of the system has been recommended. The recommended lighting system suggested in this thesis is possible to be used for such reconstruction as it meets all the parameters and criteria of the illuminance.
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Measurement of HV equipments by electronic bridge.
Kumičák, Ivan ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The main idea of this thesis is measurements of dielectric materials by using a device Tettex. The thesis is about basic physic properties of dielectric materials. The determination of a dielectric material is considered. The behavior of these materials in electrical fields and reasons, those can have an influence on it, are considered as well. In the text are described measuring methods of chosen parameters of dielectric materials by device Tettex and its functional principles. There are an evaluation of measurements, which were done, and a discussion about achieved results.
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