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Steady State Calculations of Model IEEE Networks
Kintr, Kryštof ; Vyčítal, Václav (referee) ; Krčál, Vít (advisor)
This bachelor thesis is focused on power-flow calculation. At first the problem is initially discussed in general. This is followed by a brief description of the mathematical methods used in the calculation, followed by an overview of the software that enables this calculation. Then, the modelling of some basic power system elements is described and selected IEEE test feeders are described in more detail. Thesis continues by a description of the OpenDSS computational program and its capabilities, including a description of the features of the related OpenDSS-G program. The principles of code writing are presented using examples from a selected test feeeders IEEE 13 and IEEE 30. It is followed by a description of automated computation, for which a script was written in MATLAB and a unified data entry format was suggested in EXCEL, which is the main contribution of the thesis. Finally, the results obtained by the automated computation of selected test feeders from OpenDSS are compared with the results from the demo codes for OpenDSS as well as from other computational programs, pandapower and GridLAB-D.
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Program for calculating the resistance of earthing systems
Gura, Roman ; Topolánek, David (referee) ; Vyčítal, Václav (advisor)
The bachelor’s thesis addresses the issue of grounding systems, which are essential for the safety and reliability of electrical installations. The aim of this thesis is to develop a software tool for calculating the parameters of grounding systems based on their geometric dimensions, in accordance with corporations’ norms. Resulting program automates the calculations using an intuitive graphic interface including the display of the system.
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Demonstration of symetrical commponents for educationl purposes
Birošová, Tereza ; Jurák, Viktor (referee) ; Vyčítal, Václav (advisor)
The aim of this thesis is to design laboratory tasks to demonstrate the emergence of symmetrical components. A theoretical analysis of the theory of symmetrical components was conducted in addressing this issue. The purpose of this work is to enrich the laboratory teaching of the course Distribution of Electrical Energy, taught in the summer semester of the second year of the study program in Power Electrical Engineering and Energy. The proposed laboratory tasks include measuring various types of faults, such as singlephase, two-phase, and two-phase-to-ground faults. Students will compare these faults with each other in different system configurations consisting of transmission line and transformer models. The laboratory tasks are designed to provide students with practical experience and a deeper understanding of the theoretical concepts taught in the course. This practical application of the theory of symmetrical components will help them better understand and solve problems associated with electrical power distribution. In this way, the work contributes to improving the quality of education and prepares students to tackle practical challenges in the field of electrical power engineering.
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Calculation of earth current distribution in OpenDSS
Capyk, Jan ; Koudelka, Jan (referee) ; Vyčítal, Václav (advisor)
The thesis deals with the ground current distribution in electrification systems. The first part introduces the reader to the electrical parameters of distribution system elements and options of their calculation. Various factors and environmental influences that can affect the parameters of individual network elements are described using graphics dependencies. The second part of the thesis describes the creation of a network model in the OpenDSS program, which is an integral part of the study in question used to make complex calculations for the given issue. Furthermore, this part contains created models of distribution networks at voltage levels of 110 and 0.4 kV on which individual simulations are performed, including a single-phase fault. These network models are used to observe the effects on the magnitude of current distribution through the grounding system, grounding wires and the PEN conductor, in connection with changes in the arrangement of conductors on masts, with changes in wiring, etc. Finally, the obtained simulation values are compared with theoretical assumptions and evaluated.
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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.
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Magnetic field measurement with gaussmeter FW BELL 4090
Urbánek, Pavel ; Krčál, Vít (referee) ; Vyčítal, Václav (advisor)
This thesis focuses on the basics of magnetic field and its measurement. The field will be measured with the FW Bell 4090 instrument and depending on the success and accuracy of the measurements, the bachelor thesis should include a possible integration into teaching. The measurement of the magnetic field will be adjusted to verify whether the device parameters in accordance to the manual. The most important attributes are the accuracy of single field or multi-field measurements, the accuracy of measurements in all axes of the instrument, and measurements over a given frequency range.
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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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Determination of electromagnetic field distribution around underground power cable
Gromotovič, Ivan ; Paar, Martin (referee) ; Vyčítal, Václav (advisor)
The thesis deals with the distribution of the electromagnetic field around the conductor in the way of laying the conductors. The paper describes the structure of the cables and their lettering. More detailed is described the underground cable and various ways of protecting the conductor against mechanical damage are shown. The functions of the locator of underground lines on the electromagnetic field principle are briefly described . In the practical part, in simulation software Ansys Maxwell has been designed models to simulate the layout of the underground line. The output of the thesis is the comparison of the results created by the simulations.
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The measurements of earthing systems and the role of electrical soil resistivity
Capyk, Jan ; Jurák, Viktor (referee) ; Vyčítal, Václav (advisor)
The theoretical part of the thesis is focused on explaining the concept of soil resistivity, applicable methods of its measurement, comparison of two methods used to measure the resistance of the earth electrode and a description of the measuring device Metro PU 193 used for the practical part of the thesis. In the practical part, the reader is acquainted with the results of measuring soil resistivity and earth resistance in the field, with their evaluation with respect to various influencing factors and with designs of earth conductors for high voltage poles for which soil resistivity was measured. The thesis contains plotted graphs of various dependencies according to the results of measured values and compares them with theoretical assumptions.
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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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