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Loss-of-excitation Protection for Synchronous Generator
Čáslava, Jiří ; Geschwinder, Lukáš (referee) ; Orságová, Jaroslava (advisor)
The aim of this work is to create a theoretical analysis of the problem of the exciting and de/exciting systems of synchronous alternators, an analysis of their functions and the problem of their disturbances, in connection with this being the following analysis of the asynchronous operation of the generator which appears with a big drop or with total loss of excitation. Further, it is necessary to carry out an analysis of the marginal loading and of the transient phenomena during the loss of excitation with the following summary of the knowledge and of the possibilities of the excitation loss diagnosis. The next task is to get acquainted with the possibilities how to protect machine protection terminal REM 543 produced by the ABB company, as well as with their following configuration and testing, for which we use the testing equipment of the protections TZO 3 produced by EGÚ Brno company. The primary goal of this work is to create a detailed direction for the calculation of the parameters necessary to put up the protection function UE6High of the REM 543 terminal, further to create the configuration of the protection communication and of the TZO 3 test device with PC, as well as to put up the REM 543 terminal including the putting up of the test TZO 3 device. The UE6High function works on the principle of the distance protection which is the most extended and the most effective to detect the loss of the synchronous alternator excitement. By means of the calculated values we carry out the putting up in order to pull out the MHO characteristic on the impedance level. The work also contains the measured values of the switch characteristic on the impedance level for various putting up of the rapidity of change of the excitement working quantities like voltage, current and phase shift measured within all three phases.
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Synchronization of Generator by Applied Synchro-check Relay in Feeder Terminal
Gregr, Tomáš ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
The aim of this work is a theoretical analysis of the parallel operation problems of electrical networks, as well as of the connecting the synchronous alternators to the electric power system. The knowledge of the present methods of connecting the synchronous alternators to the common network, of the historical evolution of this set of problems, of the phase conditions, their permitted deviations, as well as of the actual use of the modern phase automatic equipment, thereafter we to concentrate exclusively on the function of the synchro-check feeder terminal REF 543 produced by the ABB company. A part of this work is the analysis of the transient phenomena, that of accurate phasing, as well as that of phasing during a voltage, frequency and phase shift. Thereafter our goal is to get acquainted with the configuration program CAP 505, to carry out the communication of the REF 543 with PC, creating a new project, its configurating and then transmitting it to the REF 543 terminal. Further we occupy ourselves with the project to adjust the synchronous function synchro-check to phasing. The main task of this work is the proposal and the following testing of the connexion with the aim to test the synchronous function of the REF 543 terminal in cooperation with the output circuit breaker simulated on the test panel from the ABB company. Using the 6-phase generator from the UNIMA-KS company, this will simulate the voltage of the alternator. The network voltage is induced by means of the three-phase autotransformer from the Křižík n.p. company. We end this work up with a detailed description of connecting the terminal to the computer, with its following configuration, with setting up the required values, as well as with connecting the apparatus on order to test the conditions for the correct connection of the whole device.
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Accumulator Charger for Bicycle
Kufa, Jan ; Kubíček, Michal (referee) ; Šebesta, Jiří (advisor)
The aim of this thesis is to suggest a suitable way of charging mobile devices by using bicycle. In the first part of bachelor thesis there are discussed various options for charging the battery on a bicycle, described differences between the alternator and dynamo, and finally the different types of batteries. The second part describes in detail used blocks that were used in the engagement and the reasons of their choice. In the last section there are described the final parameters of the charger.
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Strength Analysis of Alternator Body
Kratochvíl, Petr ; Vopařil, Jan (referee) ; Novotný, Pavel (advisor)
In this diploma thesis is theoretically described and then practically performed stress analysis of alternator body, which in terms of traffic racing car often passes into disrepair. It is used reverse engineering method. The real part is converted to digital model and analysed using FEM calculation. Incoming data for FEM are obtained by experimental measurement on the car.
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Mechanical losses of modern powertrains
Vaňkátová, Kateřina ; Czakó, Alexander (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the issue of mechanical losses in internal combustion engines of passenger cars. The following chapters describe the origin of mechanical losses, the area of their occurrence in the engine and in the accessories driven by the engine. Furthermore, the work summarizes the current knowledge in the field of reducing mechanical losses and methods of determining the engine losses during their development. The aim of this work is to acquaint the reader not only with the issue of mechanical losses, but also with their significant negative impact.
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Increase the Rated Voltage of the Vehicle's Circuit - Study
Škrla, Milan ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
Baccalaureate work themed Study voltage boost seat power control nets motor vehicles is document analysing actual fulfilment seat power control nets motor vehicles. S consideration on historical evolution, actual form and possible to dissemination seat power control nets are in work rectified conditions and groundwork for possibility heighten voltage rating. Size input appliances for purposes baccalaureate work were to be timed on motor - car lower middle class. Record from metering served for theoretic proposal source text system intended for increased surface explicit tension plumbed vehicles.
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Increase the Rated Voltage of the Vehicle's Circuit - Study
Horák, Richard ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
The point of this work is evaluate the parameters of automotive electric system and according to these properties choose suitable norm of higher voltage, propose conception of system and with analyst calculation suggest basic granary parameters of higher voltage. This calculation is enclosed. In the work is mentioned a historical development of required escalation in system and therewith connected changes of specified levels of system tension. As an exemplification of escalation calculus hereof electrical equipment, installed onto motor powered vehicle, are mentioned in attachment schema's of four vehicles Škoda Auto a.s.
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Mechanical losses of modern powertrains
Vaňkátová, Kateřina ; Czakó, Alexander (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the issue of mechanical losses in internal combustion engines of passenger cars. The following chapters describe the origin of mechanical losses, the area of their occurrence in the engine and in the accessories driven by the engine. Furthermore, the work summarizes the current knowledge in the field of reducing mechanical losses and methods of determining the engine losses during their development. The aim of this work is to acquaint the reader not only with the issue of mechanical losses, but also with their significant negative impact.
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Claw-pole automotive alternator design.
Szekeres, Vojtech ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The thesis deals with the alternators used in passenger cars, their desing, function and typical behaviours and characteristics and design. Alternators are specific with the trapezoidal shape of rotor poles, which produce a waveform similar to a square wave instead of a sinusoid. This is more desirable for simple rectification to direct current, which is used in the electrical distribution system of automobiles. Because of the shape of the poles, these alternators are also called the claw-pole. The design itself consists of creating an alternator in Ansys Maxwell software in compliance with real measured alternator. The results are compared numerically and also graphically.
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