National Repository of Grey Literature 192 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
The motor drive control of the gas insulated disconnector of ABB switchgear
Kyseľ, Martin ; Ficek, Jan (referee) ; Orságová, Jaroslava (advisor)
This bachelor's thesis focuses on addressing the issue of controlling three-position disconnectors in gas-insulated switchgear by ABB. The aim of the thesis was to create drawings for three-position control methods and analyze their properties. The introduction provides a detailed analysis of the structure and components of gas-insulated switchgear. It further examines the issue of three-position disconnectors and their various control methods. The practical part of the thesis deals with the design of standardized control circuits for disconnector motor drives, which efficiently utilize space and optimize costs. The individual circuits were compared to select the most suitable replacement for the original control system. A model was created to verify the functionality of the proposed solutions, serving to demonstrate their operation.
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.
Implementation of BIM in the design process of distribution systems
Viktorin, Tomáš ; Čáslava, Jiří (referee) ; Orságová, Jaroslava (advisor)
This thesis is focused on the issue of introduction of Building Information Modeling (BIM) into the design of distribution system in EG.D, a.s. The first part of the thesis is devoted to the introduction of the design issues in the electric power industry. Then it describes the issues of BIM and how it aims to improve the processes related to the design, implementation and maintenance of buildings in the distribution system. Last but not least, it aims to present the legislation and technical standards, and how they are followed in design practice. The main part of this thesis focuses on three key areas: the creation of a graphical and information standard for EG.D, Inc., the creation of a library of elements, and the verification of the standard and library on a sample substation project.
Protection of combined HV lines
Jedlička, Dominik ; Matuška, Marcel (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with the issue of protection of combined underground cables and overhead lines in effectively grounded networks. It compares the issue of protecting overhead and cable lines and the implementation of autoreclosing. The last part deals with protection settings on a specific combined line.
Project of Overhead Line
Chrástek, Radim ; Těžký, Jiří (referee) ; Orságová, Jaroslava (advisor)
Overhead line has to suit a series of requests, so that all its parts safely resist mechanical and electrical tension. This bachelor’s thesis deals with mechanical tension. At first, necessary overhead line’s relationships under different climatic conditions are deduced. Consequently, practical calculations are introduced. Calculations are done with Matlab program.
Hybrid AC/DC,AC/AC substation operation analysis
Lakomý, Marek ; Orságová, Jaroslava (referee) ; Dohnal, Petr (advisor)
The work analyzes the operation of hybrid substations. The first chapter provides an analysis of domestic traction systems and describes in detail specific station. The next chapter follows the first in a way in which obtained parameters are converted to parameters suitable for the simulation program and presents its results. The third chapter discusses the serial communication used in one switchgear and about voltage regulator that controls one high voltage field. The last chapter verifies the simulation results obtained from the second chapter with real measurement and direct comparison is also included.
Analysis of Mechanical Stress during Short Circuit in an Air-Insulated MV Switchgear
Bártů, Jan ; Bajánek, Tomáš (referee) ; Orságová, Jaroslava (advisor)
This Master thesis is based on problems of force effects of the magnetic field of short-circuit current. Firstly, I analysed the force action of the three phase busbars during the three-pole short circuit. The analysis was performed in the Ansys Maxwell program and I verified the correctness of the analysis by numerical calculation. The second practical part was executed for ABB company. The main task was to analyse the force effects of the short-circuit current in the HV switchgear with focusing on the arms and contact system of the circuit breaker. The simulations of the following configurations were performed in more details: three configurations of the simplified VD4 circuit breaker, two types of VD4 circuit-breaker contact systems and a linear circuit breaker configuration model. The objective was to calculate the forces acting on the current path of the arms and contact system of the VD4 circuit breaker during the three-phase short-circuit and to simulate the effects of forces on these current parts. For modelling of individual assemblies, calculations and simulations I used: SolidWorks 2014, Ansys Maxwell 16.0 and Ansys Workbench 14.5 programs. With SolidWorks 2014 3D CAD software were modelled simplified assemblies of circuit breakers and contact systems. These systems were imported into the Ansys Maxwell software, where the force effects of the magnetic field of the short-circuit current were calculated. In Ansys Workbench programme was simulated the effect of forces on the current circuit breakers. Moreover, the final deformations of the materials (with respect to the mechanical properties of the structure) were plotted. The analysis of force effects of the magnetic field was performed for the specified static short - circuit current value.
Testing of Distance Protection
Řehoř, Jiří ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
The testing of distance protection in bachelor´s task is made a distinction between protection, requirements and relegation. This testing is also consisted in principle of function, describing terms of distance protection and comparing with time-current characteristics. The next step after short estimation was describing digital distance protection SIPROTEC 7SA511. The advantages are included in this estimation. The next part contains some configurations and connections with a test equipment in order to take control of measuring through the computer. The extended configurations are also comprised of two programms – DIGSY and TZO3. We had to make a suggestion of suitable methodics for measuring a time-current characteristic. We carried out three measurements where the test equipment was set to role of type TREND. A magnitude is generated at the output that is changed linearly in time with required rate (speed). We changed a current IX1 for our measurements that was undertaken with a rate of current rise. This process was given by a test equipment when the set values were constant. In the second measurement we modified a size of shift phase in the test equipment. In the third measurement we tried to set up different sizes of particular impedance characteristics (zone) inside of the distance protection where was set a neutral breaking time for the measured zone. On the contrary, the previous measurements had an absolute time.We have introduced evaluated results of measuring and observations in the end of this bachelor’s thesis.
Dimensioning of Supporting Constructions for MV Overhead Lines
Křepela, Pavel ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
The reason of supporting constructions is to transfer all power activity and fulfill all requirements on safe operation of electrical grid. This bachelor’s thesis deals with designing of supporting constructions of the overhead line MV. The main task is to acquire knowledges about single parts of supporting constructions and to describe steps of power effects calculation according to current legislation. The outcome is a simple software application for supporting constructions design from power effect viewpoint.
Short Circuit Calculation and Generator Protections Settings for Hydro Plant Lipno I
Guliš, Tomáš ; Jaroš, Michal (referee) ; Orságová, Jaroslava (advisor)
This Master 's thesis deals with the topic of protection of generators in case of faults, short circuits and their calculation according to the valid standard ČSN EN 60909-0 ed.2. The practical part includes the calculation of the minimum and maximum short-circuit currents of the Lipno I hydroelectric power plant at various locations using the NetCalc calculation program and for comparison of program funcionality provides the manual calculation. Next chapter deals with the calculation of settings of each protection function of the SIEMENS Siprotec 7UM622 protection relay, which is used to protect main generators of this hydropower plant.

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