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The voltage restoration in Prostějov and Zlín distribution area
Wasserbauer, Vojtěch ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
The aim of this thesis is description of critical situations in the electrical grid and the consequences which can be caused by these situations. Further possibilities of voltage recovery and ways how to reach the needed voltage are described. Another part is firstly about regulation electrical system and resources which are connected to this system. Secondly there is appraisal of possibility of connection new resource into distribution system 110 kV and conditions of connection new resources. The result of the thesis is description voltage recovery and the rules which have to be kept during critical situations.
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Intercultural Differences in Competencies of Czech and American Manager
Toman, Petr ; Koleňák, Jiří (referee) ; Konečná, Zdeňka (advisor)
The goal of my bachelor's thesis is the identification of cultural differences, which are influencing Czech and American managers. I am dealing with a question of national culture, sight on Czech Republic and United States of America. I am dealing with a question of corporational culture and with a question of intercultural management as well. For analysis of these topics I used theoretical knowledge and questionnaire inquiry. The outcome of my thesis is a suggestion of culturally symptomatic style of management for Czech and American managers in international environment.
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The Analysis of Factors Affecting Electricity Consumption
Seiml, Jan ; Mařica, Lukáš (referee) ; Toman, Petr (advisor)
The aim of this thesis is to describe the course of consumption of electricity. One of the feasible ways of description is statistical analysis, which enables to calculate statistically significant factors and their combinations that contributed to the course of consumption of electricity. These factors may be used for modulation of future electricity consumption, and therefore also for long-time prediction. The second chapter discusses the expansion of electricity usage in the Czech Republic from the turn of the 19th century until nowadays. The chapter describes the development of transmission system, development of electricity consumption in the sectors of the national economy, possibilities of using electric energy, and overall balance of electricity and sources of energy. The third chapter presents an overview of usage and consumption of electrical energy in the neighboring European countries as well as in the most interesting countries of the World. The fourth chapter contains statistical analysis. The first part of the chapter details a list of the analyzed quantities of individual consumptions, of the investigated factors, and the analyzed countries. Further, the chapter explains the method of statistical analysis via using simple and multiple regression and its subsequent application and evaluation for the Czech Republic and the others European countries. According to the result, it is GDP that has the main impact on the trends in the course of consumption of electricity. However, it is necessary to consider other factors influencing the consumption of electricity, too, and not rely solely on GDP in terms of long-time prediction of electricity consumption. The fifth chapter discusses the reduction of electricity consumption and savings, which can be both political and macroeconomic result. Quantification of savings is not always unequivocal and any cost-saving actions can lead to an increase in electricity consumption, which can, in effect, be bigger than any possible savings.
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Energy meter testing by test set CMC 256plus
Jurka, Tomáš ; Topolánek, David (referee) ; Toman, Petr (advisor)
The thesis provides a reader with a brief overview of the basic methods for measuring active electric quantities, development and types of energy meters. Some of the standards related to the energy meters are also included. Then follows the description of tests concerning both electrome-chanical and electronic meters of accuracy class number two. The thesis also includes a brief overview of energy meter testing devices from other producers. The next section describes test set OMICRON CMC 256plus and Test Universe program. The main part of the thesis consists of the scheme and the implementation of laboratory work for testing the energy meters with test set OMICRON CMC 256plus.
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Ferroresonance Phenomena in Power Systems
Benda, Tomáš ; Honzák, Aleš (referee) ; Toman, Petr (advisor)
Diploma thesis deals with ferroresonance phenomena which is present in power networks with saturable inductances and capacitors. A distinction drawn between resonance and ferroresonance will highlight the specific. Lack of knowledge means that it is readily considered responsible for a number of unexplained destructions or malfunctionings of equipment. In the work is a description of such behaviours means risk for electrical power systems. Finally, last part presentat produkt by ABB company intend for damping oscillations and summaries measures on it.
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Short circuit current of synchronous generator
Šebesta, Ondřej ; Orságová, Jaroslava (referee) ; Toman, Petr (advisor)
The thesis deals with the problematics of short-circuit current of synchronous machine. The first section focuses on the theoretical process of short-circuit current of synchronous machine and describes how this transient process changes throughout it's duration and with what reactances and time constants it is defined. Subsequently, this section deals with the methodics of tests of the snychronous machine,which may be used to set it's reactances. The second part of the work focuses on measurement of the short-circuit current in a specific synchronous machine. Further, there are measurements of processes of the short-circuit in time and their analysis. The last section of the thesis deals with the simulation of short-circuit current process. The simulation is ran by the Matlab/Simulink software. Simulated processes of short-circuit are then compared with the results of measurements from the previous section of the thesis.
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Short Circuit Calculation of MV Grid
Knápková, Dagmar ; Topolánek, David (referee) ; Toman, Petr (advisor)
This bachelor’s thesis deals with the faults in the distribution networks, focusing on shortcircuits as the most common and the most signiĄcant types of faults. The thesis is divided into theoretical and practical part. In the theoretical introduction, describes the types of faults in distribution networks with a focus on the short-circiuts, their causes, and the impact on distribution networks. Follows a description of the time course of short-circuit currents, short-circuit calculation simpliĄcation assumptions, the formula for calculating the impedance of the various elements of the short-circuits schema and the calculation methods of short-circuit currents in accordance with ČSN EN 60909-0. In the practical part, there is an example of the calculation of simple network conĄguration. Follows an analysis of the real network, including the analysis of the method of operation and the selection of appropriate method for the calculation of the short-circuit. After that are carried out practical calculations short-circuit conditions in four places on the network, and three diferent types of short circuits. For one-phase short-circuit is subsequently carried out the distribution of currents in a parallel branch of the distribution lines. At the conclusion of the bachelor’s thesis is caried out evaluation the results and analysis of the data obtained by calculation.
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Load Flow Calculation and Design of Distance Protection Relay Settings of 110 kV Overhead Line
Jasenský, Filip ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
Bachelor thesis load flow calculation and design of distance protection relay settings of 110 kV overhead line acquaints with the theory calculation of steady operation, short-circuit conditions and a proposal setting the distance protection. The theoretical part is made an example of a simple calculation to show leadership methods of calculation. The practical part is a calculation of steady operation and short-circuit conditions. Short-circuit ratios are calculated for a single operation and parallel operation of transformers in Otrokovice. Calculated using the initial shock symmetrical output from the calculation of short-circuit conditions is verified by short circuit resistance of substations. The practical section setting the distance protection ABB REL 316*4 and compensation earth faults. Calculation of steady state and short-circuit conditions designed basic operational state of the network, for which the design of a distance protection relay settings.
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Risk Engineering in Czech Power Engineering
Míčková, Petra ; Krebs, Zbyněk (referee) ; Toman, Petr (advisor)
The work focuses on risk management in the Czech power engineering, introduces its functioning and connections. It also explains some of the general principles of risk management, its importance in the energy sector and energy projects. Selected risk management methods are described, which is the basis for the recommendation of one of them for application in the field of power engineering. The selected method is further demonstrated in the example of power energy project and its enhancements are proposed.
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The analysis of parallel operation variants of supply areas 110 kV Čebín and Sokolnice
Reiter, Martin ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
The diploma thesis is focused on the analysis of parallel operation of Čebín and Sokolnice substations. Different variants of parallel operation are researched. A calculation of steady state by the iterative method is described in the theoretical part. The next part briefly mentions a short-circuit and dimensioning of conductors. The possibility of overloading of lines and transformers is discussed in the last chapter of the theoretical part. The current state of the situation is described in the practical part. Main goal of the practical part of the diploma thesis is to design a configuration capable to parallel operation. Also another configuration of supply of this area is designed. There must be no direct connection between Čebín and Sokolnice substations on 110kV level in this configuration. This configuration should eliminate a transit flow of power. Each configuration has to fulfill the requirements on the steady state and on short-circuit current capability. One of the last chapters is focused on the steps, that should by undertaken to prevent transit flow of power.
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