|
|
Measurement of basic electrical variables on drives of LV circuit breakers
Mazálek, Tomáš ; Valenta, Jiří (referee) ; Bušov, Bohuslav (advisor)
This thesis has been created for the purpose of comparing calculated values by oscilloscope and by Excel. For this it was necessary to show a theory of electrical values of non-sinusoidal and aperiodic signal. There has been shown the methods of measuring of power consumption on motor operator for acquisition of relevant data. My thesis brings a wide overview, which is connected with motor operators. I am analyzing a principle of motor operator, methods of right measuring and I am describing a transfer of kinetic energy from driving motor to contacts of circuit breaker.
|
|
| |
|
|
Measurement of basic electrical variables on drives of LV circuit breakers
Mazálek, Tomáš ; Valenta, Jiří (referee) ; Bušov, Bohuslav (advisor)
This thesis has been created for the purpose of comparing calculated values by oscilloscope and by Excel. There is also introduced the procedure calculating the maximum generated power by using macros in Excel. For this it was necessary to show a theory of electrical values of non-sinusoidal and aperiodic signal. There has been shown the methods of measuring of power consumption on motor operator for acquisition of relevant data. My thesis brings a wide overview, which is connected with motor operators. I am analyzing a principle of motor operator, methods of right measuring and I am describing a transfer of kinetic energy from driving motor to contacts of circuit breaker
|
|
|
Electrodynamic forces in low voltage switchgear assembly
Moravec, Štěpán ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
This bachelor thesis is focusd on issues of forces which are consecquences of an electrical current in an electric low-voltage switchboards. These forces are an effect of the magnetic fields arised from the electric current flowing in a circuit. We have to design electric switchboards which are in the process of use with emhasis on their safety, because the arisen forces are very high especially in a short-circuit. Each of new construction of an electric switchboard has to pass the type test in a testing laboratory for garanting their safety in operation. This thesis also examines the simulation on 3D model of an electric switch board by OEZ.
|
|
|
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.
|
|
|
Reducing transformer inrush
Zoufalý, Marek ; Bušov, Bohuslav (referee) ; Šimek, David (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.
|
|
|
Measurement of mechanical and electrical quantities of bimetals
Kocian, Štěpán ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
This bachelor thesis focuses on bimetals. In the theoretical part is described the principle of operation of bimetals, then important parameters of bimetal, including mathematical equations. Furthermore, methods of heating bimetals are mentioned and mathematically described. The last part in theory concentrates on the standards related to the use of bimetals as circuit breakers and the corresponding agreed breaking currents. The practical part deals with measurements on bimetal. This is measurement of free deflection and the force generated by the bimetal depending on the temperature change. From the measured data, the characteristics and the dependences of the properties for bimetal were processed. The last chapter was devoted to the creation of laboratory work.
|
|
|
The fuel pump improvement, possibilities and limitation
Novotný, Vladimír ; Veselka, František (referee) ; Bušov, Bohuslav (advisor)
This thesis deals with common rail injection systems used at diesel vehicles. It contains an overwiev of manufacturers common rail systems, their construction and differences. The second part contains a description of Bosch Common Rail electrical and electronic components, and described ways of pressure control. Last chapter summarizes the possibilities for development and improvement of some parts of the system in the future.
|
|
|
Diagnostics of current path of high-current apparatuses
Váša, Lukáš ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
Bachelor’s thesis is focused on the theoretical analysis of methods of technical diagnostics with focus on high-current devices. An overview of the methods used in technical practice is elaborated. In addition, the thesis deals with the strain of current carrying path, subsequently the work focuses on the thermal stress of parts of the current carrying path and its temperature rise. Methods of diagnostics by measuring transient resistance and methods of measurement of temperatures are described and each of the methods’ advantages and disadvantages are stated. The practical part is focused on the diagnotics of the switch disconnector and the disconnector by measurement of the transient resistances of all contacts of the current carrying paths and the following measurement and evaluation of temperature rise of the components by thermal imaging camera. Adjustments to the disconnector leading to financial savings are suggested on basis of these measurements.
|
|
|
Development of voltage instrument transformer resistible against higher harmonics
Mihályi, Róbert ; Odehnal, Martin (referee) ; Bušov, Bohuslav (advisor)
This bachelor's thesis describes the basic principles of transformer operation in the first part. The following chapters focus on issue of higher harmonic frequencies. Then it describes the basic design and principles of instrument transformers, which are the main subject of this work. At present, higher harmonic frequencies are becoming more and more common in electrical networks. Therefore, this work tries to bring new knowledge in the issue of higher harmonic frequencies in instrument transformers. The last chapters describe the computational design of an instrument transformer that resists higher harmonic frequencies. This transformer must be able to transfer these frequencies to the secondary winding. It was necessary to study the standards and technical literature related to this topic in order to create the proposal.
|
guest ::
