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Switching mechanism in the molded case circuit breaker
Mejzlík, Tomáš ; Valenta, Jiří (referee) ; Dostál, Lukáš (advisor)
This paper deals with mechanical switch in circuit breaker designed for low voltage. The goal of this thesis was to analyze switching mechanism both theoretically and practically. Theoretical analysis consist of study different types of switching mechanism and analytical calculations of acceleration speed and trajectory. Practical analysis has been made taking a video with high speed camera of real switching mechanism of a circuit breaker and software analysis of the data. The next part of a thesis is about 3D modeling, animating and simulating of a switchgear switching mechanism.
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Simulation of circuit-breaker trip unit
Dostál, Lukáš ; Augusta, Zbyněk (referee) ; Valenta, Jiří (advisor)
Securing of electrical devices is important not only to protect against destruction under the effects of electric current, but also for protection of people or animals against electric shock. With increasing of living standards goes hand in hand increasing of the electricity consumption. Therefore In the grid of low voltage, there are increasing short-circuit currents. With improving technology is posed considerable demand on the performance, security and switching capacity of circuit breakers. This thesis is oriented on development of thermal and electromagnetic switch of circuit breaker on which is put a big demand in development of new types of circuit breakers. The thesis is interesting because of comprehensive use of circuits’ breakers since it can be used in AC and DC networks with frequency of 50 Hz and 400 Hz.
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Critical d.c. load current test of low-voltage devices
Fůsková, Karolína ; Ing. Zdeněk Mlynář (OEZ s.r.o.) (referee) ; Dostál, Lukáš (advisor)
This thesis deals with problems connected with circuit breakers for direct current. It explains mechanism and construction of small circuit breakers and molded case circuit breakers (MCCB) focusing on the using in AC and DC circuits. There is also explained direct current and related issues. For example, issue with DC arc breaking. An important part of this work is high-speed camera measurement of critical direct current and short circuit breaking with subsequent evaluation with PFV tool. The important part of this thesis is assessment of the critical load current for used circuit breakers
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Comparison of the temperature-rise test of low voltage circuit breaker at different operating settings
Kusák, David ; Ing. Kamil Mikyska (OEZ s.r.o.) (referee) ; Dostál, Lukáš (advisor)
The bachelor thesis deals with the evaluation and comparison of the measured values of terminal temperatures of two molded case circuit breakers of the 3VA1 series in different operating settings. temperature rise test is carried out when the device is loaded with rated current and is used to verify whether some parts of the device do not exceed the permissible warm-up value according to the relevant standard. The theoretical part of the thesis focuses on the design, principle of operation and operating states of modular and molded case circuit breakers. Furthermore, a general description of the test conditions of the temperature rise test is presented. In the practical part of this work, 45 temperature rise testand calculation of the power loss of circuit breakers were carried out. breaker series 3VA12
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Electrical system designs of the hotel complex with wellness
Veselý, Vít ; Bátora, Branislav (referee) ; Ptáček, Michal (advisor)
The bachelor thesis deals with the implementation of the technical solution - the distribution of the electrical network of the hotel with wellness. The theoretical part of the thesis presents an analysis of the basic elements used for the design of substations and busbars and introduces the basic computational apparatus for sizing transformers and lines. The practical part presents the various technical solutions for the design of the electrical network of the site, specifically addressing the design of low voltage (LV) cable lines for two variants providing 100 % backup of the electrical supply to the site and two other variants providing 50 % backup. In addition to the technical design of the individual options, the work also presents for each option their detailed financial budgets, including their overall economic comparison.
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Electrical installation in apartment buildings
Pírek, Ondřej ; Formánek, Marian (referee) ; Doležalová, Jana (advisor)
Bachelor thesis describes wiring system in apartment buildings. Theoretical part deals with legislation, main house conduit, wiring materials, heavy and low current, and also with Smart Homes. In this thesis, there is also an analytical part which is applied to specified building. In this section we have calculation for specific cable, design of wiring materails and calculation of the annual electric energy consumption. Third part includes project with technical report and attachment with drawings.
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The measurement of bimetal for a switching device
Bartek, Zbyněk ; Bušov, Bohuslav (referee) ; Kaser, Jakub (advisor)
This bachelor thesis deals with the thermal trigger of bimetallic-based safety devices. The theoretical part describes the principle of the function of bimetal, materials and production of bimetal, and important parametres of bimetal including mathematical description. Furthermore the advantages and disadvantages of specific bimetals, types of bimetals and their practical use, and standards dealing with circuit breakers are also described. The last theoretical part of the work describe basic calculations for the design of bimetal. In the practical part were measured the free deflection of the bimetals, the results obtained were processed into graphic dependencies and compared with theoretical values.
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Diagnostics of air circuit breaker for low voltage
Bartoš, Jan ; Pavelka, Samuel (referee) ; Bušov, Bohuslav (advisor)
This bachelor work is focused on low-voltage circuit breakers. It also includes the history of the low voltage circuit breakers. Subsequently, the label values of the Siemens air circuit breaker are described and the comparison of this circuit breaker with competitors' products is shown. Basic principes of diagnostics is explained in this bachelor work. Work is focused on examination of the standardized type tests such as temperature rise test, tripping limits and characteristics test, dielectric properties test.
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Project Documentation of Electrical Wiring for the Family House in Scope for Realization
Orság, Štěpán ; Janík, Daniel (referee) ; Mastný, Petr (advisor)
The bachelor's thesis is focused on project documentation for a family house in the scope for implementation. The thesis is divided into two parts. The first part presents a theoretical analysis of data distribution and materials for the design of lighting and lightning protection system. The intelligent Loxone system, which is used in a family house project, is also presented in the first part. The second part of the bachelor's thesis is focused on creation of an implementation project, which is consists of text and drawing part. The project includes budget control and risk control. The design of lighting and lightning protection system is also included here. Work drawings of wiring in the house, parts of lightning protection and design of switchboards are integral part of the thesis.
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