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Switching of modern LED light sources
Dobrovolný, Jakub ; Fencl, Jiří (referee) ; Dostál, Lukáš (advisor)
The protection of the electrical device is provided to prevent the electric shocks, protect the equipment and prevent a damage caused by electrical faults. The current protection for a small fault currents need not always have an effect. At the serious faults the current protections never work. The new type of device to protect against damage caused by electrical failure is an arc protection. The arc protection switches off safely all types of fault arc in different sizes. This work verifies its correct functionality in the case of electric circuit with deceptive signals from LED light sources. The output of the work is the measurement of the switching current of the LED light sources. The work is remarkable thanks the number of measurement for individual angles of switching on which have statistical meaning.
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Enhancement of optical diagnostics of the switching arc
Samohejl, Matěj ; Kloc, Petr (referee) ; Valenta, Jiří (advisor)
This master´s thesis si focused on determinig methodology of optical diagnostics of the switching arc using the high-speed camera Photron SA-X2. The thesis contains basic rules for proper setup of the measurement system and the rules to adjust the camera exposure. The experiments were performed on the prototype of a parametric switching chambre, while the majority of source materials was derived from the requirements of another study which was aimed on the movement of the electode spots. The process of the first adjustment of the camera, a record edit options for the presentation purposes and the process of the 3D model design of the switching arc in SketchUp software was stated. Paper contains a comparsion of the spectral filter effect and neutral density filter effect on the final record as well. The part of the work outputs are the 3D model of the switching arc and the supporting record editing software. The paper results show a degree of the inaccuracies in a optical diagnostics made from only one direction caused by the lack of the information about third dimension.
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The steel roof structure of a hall
Havíř, František ; Pilgr, Milan (referee) ; Štrba, Michal (advisor)
The aim of this bachelor’s thesis is to design the steel roof structure of a sport hall in the area of city Olomouc. The plan dimensions of the hall are 55,0 x 35,0 m and height is 15,0 m. The solution is chosen from two preliminary variants. The roof construction is on the cross-section formed by the unbalanced circular arc. The main load bearing structure is created by planar circular lattice frames with height 1,8 m, which are hinged on the columns at one side, and on the other side tailed to the underlying structure. Between main bearing arches are solid purlins, which are radially arranged. Spatial solidity is provided by transverse and longitudinal bracings.
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Potential usage of geothermal energy in the Czech Republic
Bombík, Zdeněk ; Mastný, Petr (referee) ; Radil, Lukáš (advisor)
This bachelor thesis is dealing with geothermal energy problems and its potential of possible utilization in the Czech Republic. In this work, the description of technologies for utilizing geothermal energy of higher, middle and lower temperatures, is presented. The thesis also includes the description of methods for direct and cogenerative development of electrical power. At the end of this thesis, the first realized project of geothermal equipment in the Czech Republic, situated in Litoměřice, is clarified. The work is also concerned about the analysis of its area and geothermal energy utilizing potential
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Station building in Vsetín
Mičola, Jan ; Pilgr,, Milan (referee) ; Šmak, Milan (advisor)
The master's thesis deals with the steel structures in building industry. The aim of this paper is to propose and statically evaluate the load-bearing steel structure of railway station in Vsetín. After solving the construction load by the roof cladding and external cladding, it follows by an assessment of individual elements of construction, including an assessment of their joints. From a static perspective, the roof structure consists of two diagonal arches which are joined into each other in the top and two longitudinals frames. The entire structure is designed with an emphasis on freedom of internal layout independent of the load-bearing structure.
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City of Havířov Traffic Terminal and Area in Front of the Railway Station
Řezníček, Josef ; Tušer, Jaroslav (referee) ; Koutný, Jan (advisor)
The main task of this thesis was to deal with the specifics of the location so that the newly proposed structure had the potential for sustainable development of all its features. In future space transport terminal station does not arise only an end in itself, but mainly there is created an interaction point, which results in a value and attractiveness of the surrounding land. Ultimately, this process has lead to a zcelení city, to enhance its attractiveness and the external and internal view of the city itself.
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Load carring structure of a riding hall
Kubíček, Michal ; Straka, Bohumil (referee) ; Sýkora, Karel (advisor)
Master's thesis describes the design and check of the construction of the riding hall. Here are compared two versions the steel structure riding hall. For select version is here technical report, design calculation, statement of material and design documentation. Next is prepared specialization in the field of building construction.
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Experimental verification of properties of circuit breaker quenching chamber
Kadrnka, Petr ; Vávra, Zdeněk (referee) ; Valenta, Jiří (advisor)
The circuit breakers are able to switch on and off automatically either the short circuit currents up to the limits of their breaking capacity. While the disconnection of the contacts in the switching devices are generated by the arc then it is needed to put it out quickly. A manner of the arcing in the electrical switching devices is influenced by several different factors. It must be taken into account the dynamics of a plasma, a current flowing in the electrodes, a flowing stream in a plasma and a magnetic field generated by a flowing current. This paper is devoted to describe the manner of the arcing in the arc chamber. The experiments carried out in an experimental way attempt to explain, specify and thoroughly comprehend the movements and the characteristics of the arc in a metal arc and in a metal enclosure circuit breaker.
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Usage of high-speed camera in the area of switching arc
Samohejl, Matěj ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
This bachelor´s thesis is focused on optimizing recording of electrical switching arc in magnetic switches by high-speed camera. Measurements were performed on the circuit breaker 10B without removed side case, which was subsequently cowled by neutral density filter. The voltage and current of the circuit breaker contacts were acquired by measuring system of the Laboratory of switching arc diagnostics. The energy source was motor-generator with a nominal power 16 MVA and test bench consisting of a capacitors and inductors, which have been tuned to the resonance frequency of 50 Hz. Evaluation of the measurements was taken with regard to the brightness distribution levels of the record. Results showed that the mean brightness value varies on the square of the current passing through. For proper localization of the arc, it is necessary to appropriately set the camera exposure. The main problem usually is to darken the scene enough. It was found that it is necessary to take into account that brightness level change depends nonlinear on the exposure offset. The thesis gives a proposal to determine the exposure shift of the record. The possibility of usage high-speed camera to determine the temperature distribution in the arc using the brightness equiintensities was also designed. There are mentioned suggestions how to improve recording of the arc in circuit breakers, especially in the arrangement of the optical parts.
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