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Electronic RLC meter
Dvořák, Radim ; Hanák, Pavel (referee) ; Lattenberg, Ivo (advisor)
This work deals with measurement methods of passive components R, L ,C used almost in every electrical circuit. Work describes progress of choosing the right methods for measurement and also the process of designing the autonomous RLC meter with use of ATMEL microprocessor chips. The RLC meter will be powered from rechargable battery and will be able to measure primary attributes of RLC components.
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Comparison of different types of commercial lithium-ion batteries
Šindelářová, Anna ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
The master's thesis is devoted to the comparison of different types of lithium-ion batteries. Primarily, an introduction to electrochemical power sources and their division is described. Furthermore, the thesis deals only with lithium-ion batteries. In the theoretical part, the chapters discuss the history, the principle of operation and a detailed description of the main battery parts, including used materials. A comparison of commercially available lithium-ion cells with each other as well as with other types of batteries is also included in the theoretical part. The practical part deals with the cyclinf of lithium-ion cells and subsequent evaluation of the effect of temperature on the capacitance and current characteristics of these lithium-ion batteries.
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Stabilized operation of a 400 kV power line
Girga, Eduard ; Špaček, Jaroslav (referee) ; Blažek, Vladimír (advisor)
Electrical wiring 400 kV is the most used transfer wiring in the Czech Republic with length over three thousand kilometers. It is frequently used for running out significant output from the big power plants and for its significance in electrical engineering. Theoretical part of this thesis deals with the cross-section of mainly used methods for high and extra high stable wiring voltage solution. These methods can be generally dividend into precise and rough. Both of these methods will be analyzed in next chapters. Exact solution comes out from the presumption of equally spaced parameters. The rough solution uses substitution of double gates wiring, this method is accurate enough and accelerates the calculation. Former mentioned reasons explains it’s often use in technical practice. The electric line is substituted by T-cell, II-cell or Steinmetz cell according to length and required precision. Special method of rough solution is the broad method which enables to solve randomly knotted network by using II-cell to replace electric wiring between single knots. This method is mentioned in thesis for completeness; the network solved by me is not knotted. Part of the theoretical thesis is the analysis of specific transfer cases. In computing part will be mentioned not only the computation of stable wiring state with precise an rough method - with all former mentioned cell but the computation of specific transfer cases as well. In the end will be concluded all the counts from computing part and from precision view evaluated used methods of the stable wiring solution.
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Electrical properties of nanostructured TaxOy for capacitive applications
Nováková, Tereza ; Boušek, Jaroslav (referee) ; Šimůnková, Helena (advisor)
Cílem diplomové práce bylo nastudovat a popsat mechanismy transportu náboje v tantalovém kondenzátoru. Práce obsahuje stručný teoretický úvod do problematiky kondenzátoru jako součástky a dále se zabývá jednotlivými mechanismy přenosu náboje jako je ohmická, Poole-Frenkel proudová, Schottkyho, tunelovací a emisní složka a také proudem prostorového náboje. V experimentální části byly měřeny ampér-voltové I/V, ampér-časové I/t a impedanční charakteristiky, jejichž data byla následně zpracována pomocí např. Mott-Schottkyho analýzy a byly vyhodnoceny elektrické parametry jako je aktivační energie, koncentrace dopantů, akumulační kapacita nebo potenciálová bariéra. Výsledky, vypočtené veličiny a naměřené hodnoty jsou diskutovány.
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Measurement of precise capacitance decade in environmental chamber
Schinneck, Jakub ; Bartoň, Jan (referee) ; Havlíková, Marie (advisor)
This bachelor’s thesis deals with the control capacitance decade in a climatic chamber. The theoretical part introduces a capacitance decade M525 of the MEATEST company and the program Caliber of the same company. It introduces the methods of capacitance measurement. In the bachelor’s thesis there is the calculation of the uncertainty of measuring devices. On the basis of the lowest uncertainty, we choose the most suitable measuring device. The practical part describes the measuring with the use of prepared procedure for verification of the capacitance of programmable decade. The last part contains the evaluation of the measurement results and their comparison with the manufacturer's specifications.
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2D and 3D Simulation of Electric Fields of MV Source
Kováč, Martin ; Hruška, Ivan (referee) ; Orságová, Jaroslava (advisor)
In the master´s thesis author deals with simulations of electromagnetic fields and their applications in the electric practice at the design of electromagnetic devices. The first part of thesis deals with 3 electromagnetic field simulation softwares, their comparison and selection of the best software for the practical part of the thesis. The second part contains the practical applications of electrostatic and electromagnetic field simulation of HT power supply.
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Quantification of measurement uncertainty using Monte Carlo
Mareš, Jaroslav ; Šedivá, Soňa (referee) ; Havlíková, Marie (advisor)
This master’s thesis is focused on evaluation of standard uncertanities of measurement by method GUM and Monte Carlo and theirs comparation. In first part of this thesis is made the theoretical analysis of evaluation of measurement uncertanities and proposal of methodology for evaluating uncertainties by Monte Carlo method. In the second part is described direct and indirect measuring of resistance, capacitance and inductance, including evaluation of standard uncertanities of those measurings by GUM and Monte Carlo methods. In the end of this thesis is made comparison of achieved results of spoken methods.
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Fractal capacitors properties
Chvíla, Ladislav ; Sedlák, Petr (referee) ; Hruška, Pavel (advisor)
This work is focused on computer simulations of fractal capacitors. The geometry of capacitors and its influence is investigated. Simulations are realized in programs Matlab, SolidWorks and Comsol Multiphysics. There are also several specific examples of different geometrics of capacitors their comparisons and assessment.
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Risk Modelling in Engineering Applications
Konečný, Antonín ; Karpíšek, Zdeněk (referee) ; Popela, Pavel (advisor)
The diploma thesis focuses on risk modelling in engineering applications. The knowledge obtained from statistical methods of operational research, specifically regression analysis, is used. Electrical quantities measured on the stator winding of an electrical machine (generator) are analyzed. Regression analysis and statistical hypothesis testing is performed in Statgraphics software. The success results of the regression analysis for risk reduction are documented in detail and the regression curves are visualized in graphs. Conclusions and recommendations for each generator, as well as general ones, are formulated.
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