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Short Circuit Currents in the Sokolnice 400 kV Switching Station with Direct 400/110 kV Transformation Applied
Vojtěch, Pavel ; Špaček, Jaroslav (referee) ; Blažek, Vladimír (advisor)
The destination of this Bachelor´s Thesis is to explore short circuit currents for voltage level 400 kV in the switching station Sokolnice before year 1995 and after this year, when came to installation of the convertor T402 and to voltage direct 400/110 kV transformation applied. The Thesis is detecting at relation as for three-phase short circuit do for single-phase short circuits, for 400/220/110 kV primary transformation variation in voltage and for variation 400/110 kV, the change which came after connection of the convertor T402. In base of this calculation will be explored the short circuit resistance rating switching station in agreement with parameters ordered by the comp. Inc. ČEZ Prague.
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Software Support of Project Planning
Forman, Vladislav ; Špaček, Jaroslav (referee) ; Waldhans, Miloš (advisor)
The topic of this thesis is software support for project planning. The theoretical part explains the principle of project management processes. The output of the practical part is the elaboration of the software design of the building project on a specific order, where the specific order and the processing procedure using the proposed software program is described.
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Stabilized operation of a 400 kV power line
Girga, Eduard ; Špaček, Jaroslav (referee) ; Blažek, Vladimír (advisor)
Electrical wiring 400 kV is the most used transfer wiring in the Czech Republic with length over three thousand kilometers. It is frequently used for running out significant output from the big power plants and for its significance in electrical engineering. Theoretical part of this thesis deals with the cross-section of mainly used methods for high and extra high stable wiring voltage solution. These methods can be generally dividend into precise and rough. Both of these methods will be analyzed in next chapters. Exact solution comes out from the presumption of equally spaced parameters. The rough solution uses substitution of double gates wiring, this method is accurate enough and accelerates the calculation. Former mentioned reasons explains it’s often use in technical practice. The electric line is substituted by T-cell, II-cell or Steinmetz cell according to length and required precision. Special method of rough solution is the broad method which enables to solve randomly knotted network by using II-cell to replace electric wiring between single knots. This method is mentioned in thesis for completeness; the network solved by me is not knotted. Part of the theoretical thesis is the analysis of specific transfer cases. In computing part will be mentioned not only the computation of stable wiring state with precise an rough method - with all former mentioned cell but the computation of specific transfer cases as well. In the end will be concluded all the counts from computing part and from precision view evaluated used methods of the stable wiring solution.
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Power sources in the Czech republic concentrated on using biomass
Vacek, Tomáš ; Liedermann, Pavel (referee) ; Špaček, Jaroslav (advisor)
This article introduces independent sources of electric energy in the Czech Republic, the different types of power plants, their productivity and the quantity of electric energy delivered to the main distributor. In our country, as well as around the world, commonly used fuels are fossil fuels- coal, crude oil, and gas. As the demand for energy grows, those supplies are slowly running out. Not to mention that those fuels have a negative environmental impact. They are a source of carbon, which causes damage to the atmosphere and leads to global warming. Power plants which do not produce carbon are much safer for the environment, and much more productive. However, the residue of this energy is challenging to dispose of. Nuclear energy has common attributes with renewing the sources of energies that are extremely friendly to our environment. Nuclear power plants also produce enough energy and with the usage of Fourth generation reactors, they will be able to recycle the nuclear fuels. Today, more importance is put on renewing sources which are more gentle for the environment. In the near future, CEZ Company, the largest producer of electric energy is planning to use water energy. Water energy comes from water plants or dams. Other ecological forms of energy include geothermal and solar energies. These two types of energy are not as applicable for our geographical position. Geothermal energy is commonly used on islands where there is an abundance of natural hot springs. The most discussed source of energy is bioenergy. It uses natural wood sources, recycled wood products, and applies bioenergy as a main source for thermal power plants.
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Wine cellar in Vlkoš
Špaček, Jaroslav ; Moravcová, Eva (referee) ; Matějka, Libor (advisor)
Master´s thesis, "Wine Cellar in Vlkoš “, is processed in the form of project documentation. The proposed facility is located on plot No. 2468. It is a brick building from the elements Porotherm, concrete blocks BTB, from the wood-beamed ceiling and a gabled roof. The building has two above ground and one underground floor. In the basement is a wine cellar with the production. On the first floor is a tavern with a kitchen and social rooms.V second floor rooms for accommodation.
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Stabilized operation of a 110 kV power line
Leinweber, Luboš ; Špaček, Jaroslav (referee) ; Blažek, Vladimír (advisor)
My work is dealing with parameters long high voltage (vvn)110kV with wanted output parameters(voltage rating , cos , aktive power and size of power line) namely in theoretic part as well as in practic part , which I made from required parameter values of power line concretely by direct-axis reactance and shunt admittance. At first I did the approximate calculation by reserve T-networks ( T , , , Steinmetz), by short T-network , idle T-networks and after that I made perfect conclusion and elaboration by the help of lines. I described these kind of calculation in the theoretic part. I compared the results and I determinated which method was te best.
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Reliability of Power Distribution Network
Polák, Jiří ; Belatka, Martin (referee) ; Špaček, Jaroslav (advisor)
The goal of this thesis is to inform about ways of evaluation of distribution network reliabilities in the states of the European Union and in the Czech Republic and evaluation of reliability of particular distribution network and results of used methods. Therefore, there is at first an introduction to the reliability theory, basic terms and quantities from this field. After the introduction follows the explanation of using and calculating of the reliabilities in the electro-energetics and detailed description of methods used for their calculations. There is also a detailed explanation of the basis of reliability schemes and simulative methods. This part includes the evaluation of the reliability in the Czech Republic from the position of guaranteed standards of the continuousness electric energy delivery and the individual standards are introduced and explained here. The present situation in European Union is being shown in the summary of system and customer standards of electric power supply continuousness used in the specific countries. Distribution network reliability is evaluated with the use of so called box graphs and methods for evaluation of reliabilities by giving the expenditures of probable undelivered energy and expenditures of crossing limit of the total time of interruption penalization. The box graphs method shows evaluation of the whole network and individual areas of the network from the view of number of year interruptions and the total amount of the time of all interruptions. The evaluation of the remaining two expenditure methods includes not only comparison of the whole network, but also comparison of the individual outputs of the network and their arrangement according to the height of expenditures. The comparison of the used method results is made in the thesis conclusion.
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