|
|
2D and 3D Simulation of Electric Fields of MV Source
Kováč, Martin ; Hruška, Ivan (referee) ; Orságová, Jaroslava (advisor)
In the master´s thesis author deals with simulations of electromagnetic fields and their applications in the electric practice at the design of electromagnetic devices. The first part of thesis deals with 3 electromagnetic field simulation softwares, their comparison and selection of the best software for the practical part of the thesis. The second part contains the practical applications of electrostatic and electromagnetic field simulation of HT power supply.
|
|
|
Analysis of Frequency Measurement and RoCoF in Simulation Programs
Koudelka, Jan ; Máslo, Karel (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with the issue of measurement of frequency and its derivative (RoCoF) in simulation software. The aim of the thesis was to compare results obtained in three different pieces of software (PSS/E, PSCAD, MODES). 2 disturbances were simulated in a grid model IEEE 39 bus system and values of frequency and generator speed were assessed. The results obtained in different software are diverse. This is influenced by method of modelling of synchronous generator and algorithm of calculation of frequency. Findings are important for future investigation of power system transients in simulation software and also point to potencial incorrect assassement of frequency in protective relays.
|
|
|
Increasing of reliability of power supply from the Jasenie hydropower plant to Železiarně Podbrezová
Budovec, Michal ; Čerňan, Jozef (referee) ; Orságová, Jaroslava (advisor)
This thesis deals with operation of the Jasenie hydroelectric power plant, which supplies electricity to Železiarne Podbrezová Inc. This thesis describes actual operation, devices and equipment in all substations. The second chapter briefly describes company’s history and activities of the company. The next chapter mentions an overview of the sources of own electricity production. The fourth chapter in detail deals with actual situation of the hydroelectric power plant operation, describes devices and equipment in all substations. It also outlines what measures should be taken to increase the reliability of electricity supply. Next part deals with replacing insulators on the 22 kV line. Sixth chapter is focused on protection this line by multifunctional protection relay and data transfer from HC Jasenie to the building of power engineering. In the next step is designed a backup transformer with bus control for thermal and dynamic effects of the short-circuit current. The last chapter is focused on surge protection in HC Jasenie as well as in the area of Stary závod substation. The results and benefits of this work are summarized in the conclusion. The attachment contains schemes of substations and overall overview scheme, which are used for better understanding of this problem.
|
|
|
Operational Evaluation of the Small Photovoltaic Power Plants Connected to the LV network
Černý, Jaroslav ; Mastný, Petr (referee) ; Orságová, Jaroslava (advisor)
The objective of this thesis is to perform practical measurements of two small photovoltaic power plants, compare the received results with a theoretical calculation, and evaluate how the two differ from each other. Measured data are divided into three groups. The first group evaluates an overall electric power production in the individual months and compares it with the theoretical presumption that is instrumental to a return of investment calculation. The second group shows us a development of electric power production during characteristic days. We can compare how an ideal day from the FVE production point of view looks like, in other words a sunny and clear-sky day, with the opposite case when it is cloudy and raining all day long. Another extreme is a rapid growth or a performance drop, which can happen in a pho-tovoltaic power plant and a time period when this situation can arise. The third group contains statistic data from the electric power production. They are processed in the form of histograms and polygons of production that graphically illustrate production decomposition into the individual months. These data can be instrumental to a decision making about the form of purchase, whether it is economical for us to use the so called green bonus or not.
|
|
|
Direct load angle measurement on the laboratory generator unit
Dvořáček, Jiří ; Bukvišová, Zuzana (referee) ; Orságová, Jaroslava (advisor)
Synchronous generators are the most used machines for production of electricity. Therefore it is critical to use various methods for checking operating parameters. One of the worst faults is falling out of synchronism which can even lead to machine damage. Main objective of bachelor thesis is to design a method for load angle measurement using available laboratory equipment and to calculate saturated synchronous reactances using load angle. Load angle is measured using incremental sensor and output voltage waveform.
|
|
|
Structure of Surge Arresters and Their Application in Power System
Strapko, Miroslav ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
This work deals with internal and external protection against surge phenomena occurring in the power system. Describes the atmospheric and the operating overvoltage. The main objective is to theoretically describe the issue of protection - surge arresters, which are used for different voltage levels from the view of parameters, use and construction. The last part shows the calculation of a sufficient gap between the devices of external protection against lightning - a safe isolating distance, the calculation of a protective distance of surge arresters and practical choice of overvoltage limiters for high-voltage transformer.
|
|
|
Calculation of characteristic values of the earth fault in MV network.
Písařovic, Antonín ; Orságová, Jaroslava (referee) ; Toman, Petr (advisor)
In the bachelor thesis author deals with the earth fault in MV network. In the theoretical part of thesis there are identified existing faults occuring on power lines. The pivotal point of thesis is the analysis of the earth fault in network with ineffectively earthead node. In the parctical part author calculates the total capacity of specific network and according to the obtained results he proposes the suitable arc suppresion coil to reduce the earth current.
|
|
|
Model for the Cable Thermal Characteristic Calculation
Starý, Zdeněk ; Drápela, Jiří (referee) ; Orságová, Jaroslava (advisor)
The result of this assignment is the Model for the Cable Thermal Characteristic Calculation. Firstly, there is a prepared overview that is focused on the essential ideas of cable technology. The following part describes the simple possibilities of passaging the heat. Secondly,the physical essence of warming cables as well as the possibility to discover the methods how to calculate the warming cables are also mentioned in this task.There is an opportunity to find the methods for calculating the warming cables as well. The model was verificationed in the conclusion of my assignment. The measurement was done and the empirical results were compared with the results that were achieved by modeling.
|
|
|
Description of Electrical and Mechanical Blocking in Various Types of switchgear UniGear
Janečka, Jaromír ; Pelc, Tomáš (referee) ; Orságová, Jaroslava (advisor)
In this bachelor’s thesis author focuses on medium voltage switchgear. Specifically switchgears produced by company ABB s.r.o. There is description of switchgear’s structure divided into basic blocks. Function of each block is described in detail. The second part introduces UniGear family. There is characteristic of their variants with table containing their electrical parameters. In next part author explains interlocking in switchgear and presents specific electrical, electromechanical and mechanical interlocks in switchgear. Next part contains exported schematics of three model substations made in EPLAN Electric P8 software, from which specific connections of commonly used interlocks can be read. Final part includes photographs of interlocks for extension of catalogs.
|
|
|
Testing Communication via IEC 61850 and GOOSE between ABB and Siemens Protections
Vavreczky, Gábor ; Palát, Jan (referee) ; Orságová, Jaroslava (advisor)
The main objective of this thesis is to examine the possibility of cooperation of IEDs from ABB and Siemens in accordance with IEC61850. The aim is to create and test a workflow, after which protection relays from ABB and Siemens will communicate with each other via GOOSE messages. This paper provides a description of the international standard IEC61850, as a theoretical basis. Describes in detail the configuration of protection relays SIPROTEC 7SA610 according to IEC61850. Work provides a description of the configuration tools PCM600 and IET600 which are used for configuration of protection relays RELION® REF615 by ABB. In the final part of the work experiences that are written in collaboration used protection.
|
guest ::
RSS feed.