National Repository of Grey Literature 72 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Touch voltages and earth surface potentials of selected earthing systems designs
Novodomec, Radim ; Topolánek, David (referee) ; Vyčítal, Václav (advisor)
The aim of the bachelor’s thesis was to investigate the influence of the shape, size, placement of earthing systems designes as well as the influence of the soil model on the size of the resulting potential and touch voltage during the passage of ground current. For the construction and subsuquent simulation of these phenomena, the Ansys Maxwell Desktop program was used, which is suitable for using the finite element method, as the use of analytical methods is demanding. The results were further processed in Excel into graphs. The resulting touch voltage was determined as the difference between the maximum potential of the earthing system and the potential at distance of 1 meter.
Localization of short-circuits on single side supplied HV line
Zíka, Jakub ; Jurák, Viktor (referee) ; Topolánek, David (advisor)
This bachelor‘s thesis deals with the localization of unilaterally fed short circuits on high voltage lines. The first part of the bachelor’s thesis deals with the research of the localization of unilaterally fed 1-Phase, 2-Phase and 3-Phase short circuits on the HV lines. Furthermore, individual types of short circuits are described here with suitable procedures for calculating the fault distance and definition of formulas for individual impedance loops. The second part of the bachelor’s thesis focuses on the implementation of these formulas for calculating the distance to the fault location. The input values of voltages and currents were simulated by a simple system model in the PSCAD program. Subsequently, a more detailed sensitivity analysis of individual types of short-circuits was carried out and possible detection of when individual calculation methods fail.
Evaluation of data from long-term voltage quality measurements in the 22kV network
Umlauf, Aleš ; Klusáček, Jan (referee) ; Topolánek, David (advisor)
This bachelor's thesis works with data that were measured by fourteen power quality analyzers in the analyzed area for a period of approximately 7 months. At the beginning of the work, the method of aggregation together with the limits for characteristic parameters of electrical energy is determined, according to the applicable ČSN standards. The main contribution of this work is the summary evaluation of the characteristic parameters of electric energies. In the end, the work focuses on a detailed analysis of the effect of system operation on Flickr with the aim of estimating the area of the cause of the poor quality of electricity. The influence of voltage outages and data inconsistency on the evaluation of the quality of electricity is emphasized.
Configuring and testing the faulted phase earthing functionality using the ABB protection and control terminal
Švec, Ondřej ; Topolánek, David (referee) ; Jurák, Viktor (advisor)
The bachelor thesis deals with the possibility of replacing the autoreclosing by the method of faulty phase earthing. The faulty phase earthing method is used for compensated networks, but the aim of this thesis is to apply this method to resistively grounded networks as well. The faulty phase earthing automation configuration is applied using the REF615 terminal from ABB and is performed using the PCM600 programming environment.
Hosting Capacity of the Distribution Grids for Renewable Electricity Production
Koubek, Michal ; Topolánek, David (referee) ; Toman, Petr (advisor)
This thesis deals with the topic of hosting capacity of the distribution grids for renewable electricity production. The first part of the thesis focuses on describing the back effects to the distribution network and requests for connection. Furthermore, an overview of the most commonly connected renewable energy sources to the distribution system is provided. In the practical part of the thesis, a model of a real high-voltage network was created, in which connection requests were recorded. One of the requests was thoroughly assessed, and the impacts of the connected generation on the network were evaluated.
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.
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 %.
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.
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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