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Analysis of technical solutions for power supply of traction power line
Zlámal, Marek ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
This work is the analysis of power supply for railway lines with voltage 25 kV AC. The single-phase supply has resulted in a number of problems, such as undesirable side effects associated with the one way power supply, distortion of current and voltage curve using DC engines in olders types of locomotives. Text deals with railway electric power equipment, especially with metal enclosed switchgear, insulated with air or sulfur hexafluoride. There is been elaborated in more detail the design solutions, advantages and disadvantages of their use. Methodology of necessary calculations for designing and dimensioning of traction switchgear is described later in this text, practical example for specific conditions included.
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Visualisation and animation of charge carriers in electrical fields
Kachlík, Jan ; Aubrecht, Vladimír (referee) ; Bušov, Bohuslav (advisor)
This bachelor`s thesis deal with electromagnetic field. The aim of this thesis is acquaintance with physical regularity electric and magnetic field. Especially force effect to charge carriers traveling in these fields. In second part of this project is briefly describe switching arc behavior in high voltage circuit breaker. Principle function is animated in Autodesk 3ds Max 2009. Final point of assignment is create animated presentation about production nanofibres with help of unique technology NanospiderŽ
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Analysis of effects of short-circuit current in switchgear cabinet
Prokop, Jan ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The work is focusing on dynamic effects of short-circuit currents, more precisely dynamic effects of short-circuit currents on switchgear cabinet (terminal box). The work was designated to a concrete construction type of two switchgear cabinets located on rotating machines via company Siemens Electric Machines Drásov s.r.o.. The switchgear cabinets are designed for non-explosive environment where the air is used as an insulating medium. The task was to determine how the device will behave during the three-phase short-circuit and three-phase short-circuit with earth/ground connection. The following programs were used for the calculations and simulations: Ansoft Maxwell 16.0, Ansoft Maxwell 2015 and ANSYS Workbench 16.0. By using these programs the effects of forces which acts on current paths in cabinet caused by the passage of short-circuit current were simulated, statically and also dynamically. Further the effects of pressure acting on cabinet frame during the arc short-circuit have been statically and dynamically simulated. All the results are summarized in the conclusion. Conclusion also contains the final evaluation of the functionality of both switchgear cabinets.
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Calculation of electrodynamic forces in 1600 A circuit breaker
Musil, Pavel ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The thesis is focused on the calculation of electrodynamic forces that counterwork on moving contacts of compact circuit breaker BL1600 from the company OEZ Letohrad. The thesis is divided into separates chapters that build on themselves. In the introduction the reason why we deal with calculation of dynamic forces and structural arrangement of current carrying path is described. In the following chapter there is a theoretical analysis of electrodynamic forces that conterwork on individual parts of circuit breaker´s element. The third part is devoted to structural arrangement of the circuit breaker BL1600. In this part we can find an example of using the circuit broker Modeion in practice. Two next chaptures deal with adjustment of the model of current carrying path which then serves for the calculation of electrodynamic forces. The rest of the thesis is devoted to my own calculations. These calculations are mainly stationary where we try to find the forces that conterwork on the contacts in a steady current and in a point in time. There are also dynamics calculation when we can watch the forces that counterwork on contacts in a certain time interval. The last chapter is devoted to a stationary calculation of forces that counterwork on the electrical arc which arises while turning the short-circuit current off. The obtained results are evaluated in partial conclusions of this thesis.
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Reducing transformer inrush
Zoufalý, Marek ; Bušov, Bohuslav (referee) ; Dohnal, Petr (advisor)
In this thesis is described the function and design of the transformer designed on ferromagnetic core, composed of transformer sheets. It is explained a transient inrush current of the transformer. In this work is inserted voltage and current waveforms, designed printed circuit board, serving to reduce the inrush current.
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Theory of inventive problem solving
Lněnička, Luboš ; Veselka, František (referee) ; Bušov, Bohuslav (advisor)
This thesis deals with methodology for creating innovative concepts and their solving. More precisely, TIPS methodology „Theory of inventive problem solving“. This thesis is divided into four parts. In the first part, this methodology and its five basic tools are introduced. The second part provides introduction of software Goldfire Inovator including the tools which could be useful for students working on their projects. Third part demonstrates TIPS methodology on the innovation of wind power plant supported by software Goldfire Inovator. The fourth part evaluates advantages and contributions of TIPS methodology for education and practice.
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System engineering innovation with patent search
Mrkvan, Pavel ; Huzlík, Rostislav (referee) ; Bušov, Bohuslav (advisor)
The diploma thesis deals with engineering system innovation using TRIZ methodology. This methodology uses algorithmic approach to problem solving and divides innovation into two parts, the analysis and synthesis part. The analytical part consists of steps to help find the problem and its essence, by contrast, offers a part of synthetic procedures to deal with them. The general aim is the utilization of steps and procedures contained in the analysis and synthesis part of the TRIZ methodology to a specific engineering system innovation.
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Instrument voltage transformers of outdoor type
Velešík, Petr ; Bušov, Bohuslav (referee) ; Vaněk, Jaromír (advisor)
The function analysis of instrument voltage transformer with the aid of his equivalent diagram and his phasor diagrams is main part of my masters thesis. I solve the influence and errors of his equivalent diagram’s elements on this instrument voltage transformer. Than I talk about suitable magnetic materials using for instrument voltage transformers. There are 3D pictures which show lay-out of instrument voltage transformers’s windings and his magnetic circuit.
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Behavior of Electric Arc Inside a Quenching Chamber of High Voltage Circuit Breaker
Aubrecht, Vladimír ; Bušov, B.
A great influence on the switching process is exerted by aerodynamic relations in the quenching chamber, the direct measurement of which is hardly feasible using contemporary techniques. Therefore, the shape of the arc plasma burning between the circuit breaker contacts is scanned with a high-speed camera. The photographs from the high-speed camera represent a time analysis of the studied process, which allows through their digital processing the determination of the time changes of the arc plasma shape.
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