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Design of lightning protection system for a multifunctional building
Drašnar, Antonín ; Bátora, Branislav (referee) ; Ptáček, Michal (advisor)
This final thesis describes the essentials required for the correct process of protecting objects against the destructive effects of lightning current. The focus of the practical part compares selected software tools that facilitates both the risk analysis process of possible damage caused by a lightning strike and enables the finding of adequate protection of the assessed object. The comparison of the software itself is made from the point of view of their availability, clarity and especially also from the point of view of the provided functionalities. The functionalities and options of each software are purposefully demonstrated on a defined complex building, for the implementation of two designs of the lightning protection system, specifically in the version with a distant lightning protection system and using the method of equipotential bonding. Both applied lightning protection are then compared in more detail in terms of technical and economic demands.
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Design of a transformer station for power output from a PV power plant and a diesel generator
Marák, Jiří ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This thesis is about design of a transformation station for power output from both a photovoltaic power plant and a diesel generator, serving as grid support. The primary objective is to devise a comprehensive solution including conceptualization, grid connection point, and transformer specifications capable of handling the 5 MW power output from the PV plant and the 1000 kW output from the diesel generator, including the calculation of short-circuit conditions. Furthermore, the thesis delves into the design of network breakpoints and protective measures.Lastly, it proposes dispatch control and billing metering in accordance with the operational requirements stipulated by the distribution system operator.
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Design of class AB stereo audio power amplifier
Podr, Michal ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
This thesis describes the design of a complete amplifier operating in class AB. It contain two power amplifiers with working in the bridge mode correction amplifier with volume control, bass, treble, and also with the choice of loudness. Preamplifier with three different inputs and the choice between stereo and mono modes.
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PV inverter and hybrid inverter test bench
Sedlačko, Jozef ; Morávek, Jan (referee) ; Vrána, Michal (advisor)
Electricity production from photovoltaic power plants has been one of the fastest growing energy industries in the last decade. Number of small power inverters working parallelly with the low voltage grid is growing. At the same time, the requirements for the correct behaviour of network inverters in the network by the distribution grid operators are also increasing. The thesis deals with creation of a workplace for testing the operational and technical requirements for micro-sources. The first part of the thesis consists of literature search of inverter demands according to the current rules for parallel production operation. The second part deals with the setting up of test procedures and automation. The last part evaluates selected tests of the functions of the inverters.
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Integration of Photovoltaic Power Plants in the Electricity System
Michl, Pavel ; Paar, Martin (referee) ; Mastný, Petr (advisor)
The thesis discuses an integration of photovoltaic power stations to electric network. The first part describes connecting conditions of small sources to distribution system, including administrative requirements, feasibility study, and requirements to the energy meters, measuring, control devices, switching devices and protection. The second part is aimed to describe problems of the photovoltaic system. Solar radiation generating and reducing of its intensity incident upon the earth surface are described in this part. The quantum of produced electric power depends on climatic conditions in the fixed area, seasons, etc. This work also discusses the types of photovoltaic cells and their actual efficiency. Inverters are further important components of the photovoltaic system. The parameters of the inverters have a great influence on the total actual efficiency of the photovoltaic system. Different methods of the photovoltaic panels’ connection with the inverters and their advantages and disadvantages are also mentioned. The supporting structure of the photovoltaic panels and eventually transformer are further important components of photovoltaic system. The work also analyze the methods of connection of the photovoltaic power station to distributive low voltage and medium voltage network, electric energy accumulation and possibilities of the sale of produced electric energy. The large number of the connected photovoltaic power stations has negative influences to electric network. The third part contains the design of a photovoltaic power plant with a capacity of 516,24 kWp on the scoped area in southern Bohemia. The project documentation for the location where the power plant is designed is also made. It contains the design of photovoltaic panels, the design of the inverters to get an optimal power load. This part also contains a calculation of the photovoltaic system losses and the design of transformer and the cable junction calculation of the distributive system. The feasibility study of the power plant connected to distributive system is also conducted. Its delivery rate will be connected to the distribution point Řípov (110/22 kV). The calculation results show us that this photovoltaic power plant can be linked to the distribution system. The final part of this paper contains an economic estimate of the photovoltaic power plant operating and the calculation of the return. An Economic return is influenced by the wide range of values that affect the total return rate. The calculation of an operating economy is made for several variants. The return rate in refer to contemporary redemption price for 2010 with no consideration for a bank loan is 7 years. If we consider the bank loan it would be 12 years. The penetrative reduction of the redemption price is expected for 2011. Calculation works with the decline of 30 %. It would extend the rate of return to 11 years without a bank loan or to 22 years with the bank loan. The bank loan is considered to cover 80 % of the investment.
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Requirements and solution of household electrical installation
Zelenka, Michal ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
This bachelor‘s thesis deals with the electrical installation in a family house. The first part of this thesis serves as a basis for a project of electrical installation in the family house. The thesis presents the most important requirements for the household electrical installation in accordance with applicable czech technical standards. The thesis further describes the most important methods of protection, especially protection against overcurrent and protection against electric shock. The next part is devoted to proposal of specific project of household electrical installation in accordance with applicable technical standards. The project of the electric installation is checked by calculation at the end of the thesis.
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PV inverter and hybrid inverter test bench
Sedlačko, Jozef ; Morávek, Jan (referee) ; Vrána, Michal (advisor)
Electricity production from photovoltaic power plants has been one of the fastest growing energy industries in the last decade. Number of small power inverters working parallelly with the low voltage grid is growing. At the same time, the requirements for the correct behaviour of network inverters in the network by the distribution grid operators are also increasing. The thesis deals with creation of a workplace for testing the operational and technical requirements for micro-sources. The first part of the thesis consists of literature search of inverter demands according to the current rules for parallel production operation. The second part deals with the setting up of test procedures and automation. The last part evaluates selected tests of the functions of the inverters.
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Protection of Transformer by Differential Relay
Jára, Jaroslav ; Haluzík, Evžen (referee) ; Toman, Petr (advisor)
This bachelor’s thesis deals with transformer failures and principles of their protection and a design of differential protection of transformers. The first part details with transformer failures, classification of these failures, short-circuit ground faults types, causes of the short-circuit occurrences and consequences of oil-transformer failures. The second part deals with problems of protection in general with the description of protection function, requirements of protection such as selectivity, speed of response, sensitivity and protection classification, methods of protection according to failure type - size of nominal power of transformers. It further describes principle of differential protections. Finally there are previews of historical and modern protections. The third part describes a design of differential protection of transformers. It includes short-circuit ratio calculation, example of three phase short-circuit calculation, CT ratio check, actual setting of protection and setting evaluation.
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Feeder Terminal REF 542 plus for Protection and Control
Stodůlka, Ivo ; Toman, Petr (referee) ; Orságová, Jaroslava (advisor)
The main aim of my bachelor's thesis is primary testing multifunction feeder terminal REF 542plus for protection and control by ABB company. The testing of this IED (Intelligent Electronic Device) requires good understanding of its function hierarchy, self-configuration, the available tools and especially purpose of the test. That's why the thesis is consists of these two main parts. Theoretical part is focused on the most important component description, particular module configuration procedure through the use of program Configuration Tool, programming on FUPLA graphic language and explain a fundamental terms. Practical part is focused on testing of the individual terminal properties such as testing of the measurement functions, testing of the protections functions and testing control functions. These tests verify the particular properties and at once it demonstrate practical applications in practice and laboratory education.
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