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Impact of cross-country double earth faults on voltage condition in LV networks
Fojtášek, Jan ; Vyčítal, Václav (referee) ; Topolánek, David (advisor)
This master's thesis is focused on the influence of double earth fault on voltage ratios in the compensated network. This thesis is focuses on, in particular on the analysis of voltage ratios on the secondary sides of distribution transformers when this non-local fault occurs. The compensation of the non-local double earth fault using the symmetrical components method is performed and the performance of this method is verified. The analysis of the effect of double earth fault on the proposed power system is carried out in PSCAD software and further evaluated. This type of non-local fault is investigated while modifying the various parameters of the designed system. To differentiate the double earth fault from the two phase ground fault, the asymmetry on the LV sides of the distribution transformers is investigated. A locator is provided to locate the location of the double earth fault and the two-phase ground fault, which, combined with the asymmetry values, is able to determine both the location of the fault and the differentiation of the co-located fault from the non-co-located fault.
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Simulation of earthing system resistance measurement
Pirochta, Josef ; Topolánek, David (referee) ; Vyčítal, Václav (advisor)
In this bachelor thesis, the effect of different soil models and random wire placed underground on the results of earth resistance measurements using the 4-pole method was investigated. To determine this influence, simulations were performed in Ansys Electronics software, in which different soil models (with local inhomogeneity, horizontally divided soil and soil divided at an angle) were created. In these models, the measured earth was placed together with the measured random wire and its resistance was determined by simulating the measurements and with respect to the distant ground. The effect of the different soil models on the accuracy of the measurements was determined from the differences in the resistance of the earth random wire obtained by measurement and with respect to the distant ground. It was found by simulations that, of all the variants investigated, performing measurements in the presence of different soil models and a random wire can lead to a measurement error of up to 7,2 %.
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Detail design documentation for the electrical installation Loxone of a passive house with PV system
Bolf, Marek ; Topolánek, David (referee) ; Bátora, Branislav (advisor)
The thesis deals with the design of high-current and low-current electrical wiring in a house, with emphasis on their connection to the intelligent control system Loxone. The thesis describes the house, the principle of designing lightning protection, the way of cabling, the options to control individual technologies by the Loxone system and the description of proprietary Loxone protocols and protocols through which Loxone system can communicate with other devices. In the practical part was prepared drawing documentation for the lightning conductor, cable routes, detailed connection of Loxone buses and components and high-current and low-current switchboard. Furthermore, the technical report and the budget of the electrical installation were prepared.
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Design of photovoltaic power plant for flat house
Holuša, Martin ; Topolánek, David (referee) ; Morávek, Jan (advisor)
The aim of this bachelor thesis is to develop a design of a photovoltaic power plant for a given flat house. The theoretical part deals with the basic components of a photovoltaic power plant, its legislation, the possibilities of supplying electricity to other entities and the creation of variant concepts of the photovoltaic power plant itself. In the practical part, the concepts are economically evaluated using a parameterizable form and for the selected variant is created project documentation for its implementation.
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Traction protection
Šüli, Nicolas ; Wasserbauer, Vojtěch (referee) ; Topolánek, David (advisor)
This bachelor’s thesis focuses on methods of protection for AC and DC traction systems. In thesis first deal with current state in traction, next with undesirable conditions and electrical protections. The work describes a draw in the program INKSCAPE two most often used traction power station with protection.
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Utilization of SINCAL tool in the field of network protection
Rampák, Dominik ; Wasserbauer, Vojtěch (referee) ; Topolánek, David (advisor)
This bachelor thesis is describing the basics of using program PSS SINCAL for protection of distribution networks. The thesis is divided into 3 parts. The first part is describing basics and functions of the program. The second part is devoted to the moduls, work with moduls described in form of manuals. The last part is describing creation of test network and simulation of single-phase to ground short-circuit to verify selectivity of the protection devices.
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Modern protection of distributed energy resources
Bučko, Ondrej ; Kopička, Marek (referee) ; Topolánek, David (advisor)
The aim of this thesis is to describe distributed energy resources (DER) protection system’s main problems and to suggests their possible solutions. The second part is focused on collecting information and description of the new functional principles of protection devices used for protecting distribution network against backwards influences from the DER. The purpose of the thesis is the description of functional principles of the protection devices that are not commonly used in the distribution networks of the Czech Republic. In addition, the schemes of functional blocks of the protection devices that help to configure or project them are also part of this thesis.
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Optimization of the 110 kV distribution system in the Přeštice nodal region
Nagy, Pavel ; Křesálek, Petr (referee) ; Topolánek, David (advisor)
This work describes an actual condition of a specific part of a distribution power grid. It is a research of problems based on the computer model in case some power line is in failure or shut down. Simulations are calculated for both currently used load and load expected in future usage. There are partial solutions depicted for each issue found during the simulation. Some of those are used for a final design of a distribution power grid. In the last section, there is a comparison of different types of power lines and their possible usage in the design.
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Appropriateness of modelling the actual soil model as a uniform or horizontal two-layer soil model
Kuběna, Michael ; Topolánek, David (referee) ; Vyčítal, Václav (advisor)
The present thesis deals with soil resistivity and especially the suitability of replacing various soil models with a two-layer horizontal model. First, the factors that influence soil resistivity as well as the methodology of its measuring are described, and various soil models are introduced. Then, the Ansys program was used to create several soil models: a vertical model with perpendicular or oblique division, a model with a pronounced inhomogeneity and a three-layer model. In all of these models, a Wenner measurement simulation was performed, followed by a two-layer horizontal replacement model. Then the size of the error that was created by replacing the actual model with a two-layer horizontal model was examined.
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