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Software for evaluation of data from CVVOZE laboratory
Petráček, Dominik ; Šimek, David (referee) ; Pikula, Stanislav (advisor)
The diploma thesis is focused on the innovation of partially user-unsuitable software which is used in the CVVOZE short-circuit laboratory for the evaluation of testing of switching and protection devices. The introductory part of the work presents a technical laboratory, which is used for research and development in the field of electrical devices with possibility of testing of short circuits and over-currents. At the first part of thesis, there is made a description of the technical laboratory. The following past is a chapter with basic introduction of tested devices and standard testing conditions of electrical devices in the laboratory. Then following a description of the original evaluation software is made and its shortcomings are pointed out. The practical part is devoted to the creating in LabVIEW, implementation and verification of the functionality of the new evaluation software.
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Design of earthing switch for diconnecter of generator
Petrič, Peter ; Šimek, David (referee) ; Bušov, Bohuslav (advisor)
This master thesis is focused on the design of earthing switch for the indoor three pole generator disconnector from IVEP, a.s. The main task of the theoretical part of the master thesis was mechanical and electrical calculations on the contact system and the design of two variants of earthing switch construction. It has been proposed two variants of earthing switch construction. The first variant included three earthing knives for each pole of earthing switch and the other variant included two earthing knives for each pole. The aim of the practical part of this diploma thesis was to create a model of the earthing switch for generator disconnector, to simulate the heating of the contact system by passing the short-circuit current and to prepare the production documentation. For modeling, calculations and simulations were used Autodesk Inventor 2018, Matlab and Ansys Workbench.
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Analysis of electrodynamic forces in electrcal apparatus
Dobrovolný, Jan ; Valenta, Jiří (referee) ; Šimek, David (advisor)
The master thesis deals with the phenomena called electro-dynamic force in the electrical apparatus. Nowadays, there are high requirements for electrical devices. The devices and especially their contacts are subject to high demands on reliability, reliability and mechanical durability. The electro-dynamic forces caused by the passage of electric current mechanically deform the current path. The design of the electrical apparatus must take these forces into account. Equations for electro-dynamic forces calculation are presented. In master thesis, individual parts of the current path are derived and described. Various configurations and designs of the current path are solved. The thesis also deals with the issue of forces in electrical contacts. Individual theoretical equations are then applied to a particular disconnector QAK, made by company IVEP, a.s. Parts of the disconnector were redrawn into 3D program SolidWorks. The model was analysed in program ANSYS Maxwell. The thesis compares the achieved results of analytical equations and numerical simulations.
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Assessment of the design of a small photovoltaic power plant for a family house and elaboration of its revision process
Kovaľ, Nikodém ; Šimek, David (referee) ; Veselka, František (advisor)
The bachelor's thesis deals with the assessment of a domestic photovoltaic power plant for a family house and the processing of its revision. At the beginning are explained the principle of conversion of solar energy into electrical energy, types of individual photovoltaic cells used in practice, methods of increasing the efficiency of photovoltaic modules, the most common failures of PV modules and methods of their detection. Furthermore, the assessed photovoltaic power plant is presented, its theoretically described components, graphical dependencies showing its production and the possibilities of increasing its production. The practical part of the work deals with the revision of the assessed PV plant and its documentation.
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Thermal overload trip unit in electrical switching devices
Marek, Stanislav ; Šimek, David (referee) ; Zelenka, Michal (advisor)
This bachelor thesis revolves around a time dependent thermal overload trip unit inside automated switching mechanisms. The first part addresses the principle of the function of a thermal overcurrent trip unit and the possible construction solutions. The biggest emphasis is given to bimetal as a base construction feature of the thermal overcurrent trip unit. Besides the materials that are most suitable for the creation of bimetal, various bimetal parameters that are needed for its design are also analyzed. The next subject of the thesis is an introduction to the elemental calculations for the bimetal component and the summary of mathematical relations for the calculation of the most commonly used solutions. A predominant part of this thesis revolves around the theoretical calculation of the thermal overload trip in a previously estabilished circuit breaker for a specific type of the bimetal and a specific required tripping characteristic. The previously estabilished calculation is then verified by measuring. The measuring itself consists of the measurement of the free bending of the bimetal in dependence on heat. The last part of this thesis includes the assessment of the results calculated from the theoretical standpoint, compared with the results given by the measurement.
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Design and implementation of a workplace for temperature rise testing
Bartek, Zbyněk ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This master thesis deals with design and implementation of a workplace for temperature rising measurement in electrical devices. The thesis deals with contact and non-contact temperature measurement, with the current equipment of the laboratory of switching devices used to measure temperature rising, and also deals with normative requirements for temperature rising tests for specific electrical devices and their systems. The next part of the thesis lists requirements for workplace design and subsequently describes the workplace design with 3D models of individual parts. The practical part describes the implementation of the workplace, then the test measurements with the current equipment of the laboratory of switching devices and with the newly created workplace for temperature rising measurement. The end of the work deals with the evaluation of the new workplace and the possibilities of further improvement of the workplace.
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Technologies of the electrical apparatuses protyping
Svoboda, Filip ; Kloc, Petr (referee) ; Šimek, David (advisor)
The work focuses on the production of prototypes of electrical devices. The theoretical part contains a structured overview of the historical development of prototype production technologies and description of individual prototyping technologies. The main part of the work is the design of a prototype extinguishing chamber, printing of the chamber and verification of the ability to extinguish the electric arc.
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Design of a 25 kV traction disconnector
Buchta, Martin ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This diploma thesis deals with the design of a traction disconnector for 25 kV AC and a rated current of 800 A. The result should be a competitive disconnector that is capable of potential applications on domestic railways and should have parameters that other local manufacturers do not currently offer. This is, for example, electrical strength or the size of the rated current, which is an economic option for most railway lines in the Czech Republic. According to the proposed drawing documentation, the disconnector was assembled and then the selected disconnector parameters were tested. For example, electrical strength tests, short-circuit tests, constant current tests, etc. were performed. The calculated and measured values were compared together. The designed disconnector was financially and technically evaluated on the basis of test results and the construction itself. Finally, some appropriate adjustments were proposed.
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Different approaches to the social contract theory in Law and Politics.
Šimek, David ; Havel, Tomáš (advisor) ; Ondřejková, Jana (referee)
Different approaches to the social contract theory in law and politics Abstract This thesis aims to analyze individual concepts of social contract theory in works of various contractalist authors throughout history, including the 20th century. Using the method of analysis and especially diachronic comparison it tries to refute the belief that the social contract theory is only a phenomenon of the Enlightenment period of the 17th and 18th centuries, and presents the main, but also lesser known, contractalist ideas from both ancient and recent history. The thesis is, besides the introduction and conclusion, divided into five chapters and eight subchapters, some of which are also further subdivided. It follows a similar structure troughout its length, with the exception of the first (which aims to generalize the concept of social contract theory) and the fourth chapter. The second chapter is a chronologically arranged historical overview, which begins with the authors of ancient philosophy and through the Middle Ages then culminates in the early Renaissance. This is a chapter dealing with the genesis of contractualism, especially its origins in individualism, voluntarism or naturalism, as well as the concept of individual free will and the medieval phenomenon of the struggle between faith and reason, the...
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Protection of business competion - agreements interfering with competition
Šimek, David ; Horáček, Vít (advisor) ; Horáček, Tomáš (referee)
The purpose of my thesis is to analyse two issues arising out of the European and Czech competition law provisions prohibiting agreements which restrict competition. First, I shall examine the issue of distinction between prohibited agreements and allowed unilateral conduct. Furthermore, I shall explore the definition of the concerted practice as interpreted by the Court of Justice of the European Union and Czech administrative courts focusing again on the distinction between such practice and unilateral conduct. Second, I shall elaborate on the structure of Article 101 TFEU. As a consequence of the "more economic approach" taken by the Commission and the repeal of the individual exemption system under Article 101(3) TFEU, the distinction between the concept of object offences and the concept of effect offences is slowly disappearing while having detrimental implications for legal certainty. Moreover, the conceptual distinction between considerations of ancillary restraints under Article 101(1) TFEU and consideration of pro-competitive and anti-competitive effects under Article 101(3) TFEU is slowly disappearing as well. The economics take their role in the assessment, and that is also the reason why I chose this topic because I am interested in the overlap between law and economics. My thesis is...
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