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Calculation and technical solutions earthing system of transformer substation 110/22 kV
Mašek, Jakub ; Dušek, Igor (referee) ; Bátora, Branislav (advisor)
Master's thesis deals with principles of design of earthing of a substation 110/22 kV. Specific requirements for safety have to be fulfilled when designing power installations exceeding 1kV. The aim of this paper is to design a new earthing system for reconstructed substation 110/22kV considering valid standards. Reconstruction of a property is always more or less complicated by new orders and regulations for construction. Earthing is a part of all electric equipment, therefore it is essential for the design engineer to consider a broad spectrum of requirements, even those seemingly not related to this subject, from legislative requirements to the study of reactions of a human body to electric current. The theoretical part of this work examines different approaches to earthing system's design, and analyzes the origins and earthing standards throughout history. The correctness in consideration of effects of the environment is an often neglected factor. Defining of all types of effects of the environment is a broad field, therefore this paper only summarizes the main principles. The practical part of this paper deals with the basic design of substation's earthing system and it's verification in respect of touch voltage and step voltage according to the Czech national standard ČSN 33 3201 (Power installations exceeding 1kV a.c.) and of company's energetics' standard PNE 33 0000-1 ed.4 (Protection against electric shock in distribution network and transmission system) required by the substation's distributor. This paper later quotes and takes into consideration the requirements of other standards, more or less related to listed documents, creating an interconnected body for design and testing the earthing system.
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Structural optimization of the heat switch part
Zemek, Albert ; Mašek, Jakub (referee) ; Löffelmann, František (advisor)
This diploma thesis deals with the design of a structure for heat transfer path of miniaturized heat switch. The focus is on production using SLM additive technology. The aim is to assess the possibilities of using metal 3D printing on a part intended primarily for heat transfer. This work presents several concepts of structure arrangement, which are further analysed and evaluated. The results show the potential of additive technologies in this area and the proposed structures meet the heat transfer requirement according to the calculations used.
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Modern low-emission combustion chamber for jet engines
Mašek, Jakub ; Nastálek, Ondřej (referee) ; Šplíchal, Miroslav (advisor)
Bachelor´s thesis examines modern low-emission combustion chambers for jet engines. It´s foremost aim is to specify construction parameters of low-emission combustion chambers, compare it´s features and comprise the use of these combustors in civil aviation. Thesis deals with reasons of modern low-emission combustion chamber development and estimate future development in the region of aircraft industry. Another aim is to specify legislations of aviation emissions, history of certification standards and organizations, which make and control these limits.
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Flexible structure development for efficient heat transfer
Černoch, Jakub ; Lazar, Václav (referee) ; Mašek, Jakub (advisor)
Diplomová práce se zabývá teoretickými výpočty a návrhem struktury pro přenos tepla, která je součástí Miniaturizovaného tepelného spínače podle zadaných požadavků Evropské Kosmické Agentury. Základními parametry jsou nízká hmotnost a vysoká tepelná vodivost. Práce navazuje na spínač navržený firmou Arescosmo, který nesplňoval požadované limity zejména v oblasti hmotnosti a tepelné vodivosti. Pomocí teoretických výpočtů hmotnosti a tepelné vodivosti bylo ověřeno 49 variant ve třech základních konceptech – Mechanická struktura, flexibilní struktura složená z drátků a foliová struktura. Z hlediska tepelné vodivosti jako nejlepší struktury vycházejí ty, které jsou založené na použití ochranných kovových opletů. Z dostupných zdrojů byly rovněž navrženy technologie, které by bylo možné využít pro výrobu těchto struktur. Pro splnění požadavků, bude v další fázi projektu nutné vyrobit experimentální vzorky na kterých budou teoretické výpočty a vybrané technologie ověřeny.
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Verification of multi-layer insulation in simulated space environment
Čapka, Filip ; Mašek, Jakub (referee) ; Lazar, Václav (advisor)
První část této práce se zaměřuje na popis momentálně používaných metod termo-regulace u vesmírných plavidel. Zaměřuje se konkrétně na vícevrstvou izolaci zvanou MLI. Která je jednou z hlavních pasivních forem kontroly teploty. Popisuje materiály používané na MLI a dále uvádí problémy, které nastávají při jejím používání a výrobě. V druhé části je poté popsán navrhnutý experiment, který má ověřit funkčnost MLI jako izolaci proti tepelným ztrátám. Na konci jsou shrnuty výsledky tohoto experimentu
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Low NOx emission combustion chamber of turbine engines
Šafránek, Martin ; Mašek, Jakub (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis examines Low NOx emission combustion chamber of turbine engines. It describes in particular the events taking place in the combustion chambers and the mechanisms of generating all monitored emissions. It also focuses on the description of the most important design parameters, their estimated development, assessment and use in civil aviation. Further, this thesis deals with the legislation of various organizations that create certification standards for regulating the amount of emissions emitted.
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The frost susceptibility of the soils and materials to subgrade of the pavements
Mašek, Jakub ; Zajíček, Jan (referee) ; Stehlík, Dušan (advisor)
This diploma thesis deals with the issue of the determination of the frost susceptibility of soils in the subgrades of road structures. The theoretical part compares the ways of testing the frost susceptibility in the Czech Republic and other selected countries of the European Union. Furthermore, it also deals with the development of the frost susceptibility index in the Czech Republic. The empirical part focuses on the laboratory testing of the frost susceptibility of the given sample of soil by the direct frost heave method. Moreover, it also deals with the simulation of penetration of frost by the subgrade and the possibility of shortening the length of the freezing during the direct testing the frost susceptibility.
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Asymptotic stability of systems of linear ordinary differential equations in engineering
Mašek, Jakub ; Opluštil, Zdeněk (referee) ; Tomášek, Petr (advisor)
This bachelors thesis is dealing with stability of system of linear ordinary dierential equations and specially lyapunov stability and asymtotic stability.The are established necessary concepts from the theory of stability and form systems of dierential equations at rst. Furthermore there are listed basic methods for determining the stability of linear dierential equations with constant coecients and they are compared. The next part of thesis is dedicated to trajectory in plane with focus on isolated singular points. At the end are two technical applications and they are linked sections and oscillators.
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Computer control and programming of elements of intelligent electrical instalation KNX
Mašek, Jakub ; Baxant, Petr (referee) ; Bátora, Branislav (advisor)
The goal of this Bachelor thesis is to introduce to students the basics of working with the modern possibilities of buildings electroinstallation with the help of the KNX system. On the following pages is described a brief history of the system, the way it has developed, which organisations have involved in the developement and the needs for which it was created. The next section is focused on the system topology, the scructure of the network and important elements appearing in the decentralised system. Further is the thesis concerned with the principles of telegram communication, it’s process and available software support for the KNX system. The last practical part deals with programming in the KNX system and offers four different practical excercises created for the available laboratory control panel. Each of the excercises includes a problem, technical drawing of electical circuit and the problem analysis, which serves as a manual to solve the excercise step by step. Single excercises are designed to logically and by difficulty follow from lighting circuits, heating and cooling to eventually deleting and preparing the laboratory control panel for next lecture.
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Experimental study on satellite´s passive thermal-regulation units
Mateášik, Timko Marek ; Mašek, Jakub (referee) ; Lazar, Václav (advisor)
Diplomová práca sa zaoberá vplyvom termálnych medzivrstiev na tepelnú kontaktnú vodi- vosť a tepelný kontaktný odpor. Práca sa zameriava na aplikáciu termálnych medzivrstiev pre vylepšenie tepelnej kontaktnej vodivosti v tepelnom spínači a v kozmických zariade- niach obecne. Teoretická časť práce stručne skúma rôzne pasívne termálne kontrolné systémy použí- vane v kozmických zariadeniach, vrátane termálnych medzivrstiev, a vysvetľuje pozadie tejto práce. Táto práca ďalej skúma rôzne termálne medzivrstvy, predovšetkým povlaky a fólie, a uvádza výber vhodnej termálnej medzivrstvy. Experimentálna časť práce skúma povrchové parametre, tepelnú vodivosť a mikrotvr-dosť medených vzoriek, ktoré slúžia ako substrát pre povlak čistého striebra. Ďalej rieši podmienky merania, metódy vyhodnocovania a samotné experimentálne merania. Experimentálne merania sú vykonané v termo-vákuovej testovacej komore a na základe výsledkov sú vyvodené závery. Pre ďalšiu prácu sú uvedené doporučenia.
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