National Repository of Grey Literature 342 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Simulation Of Three-Phase Short Circuit Condition On A Synchronous Machine
Koudelka, Jan
The paper deals with three-phase short circuit current of a synchronous machine. Transient phenomena of the machine during short circuit condition are described in the text. Simulations of this fault were carried out in two different pieces of software – PSCAD and PSS Sincal. Results of simulations are compared to a measurement on a real machine and discussed.
Transmission system of the Czech Republic after 2040
Gabrys, Dominik ; Koudelka, Jan (referee) ; Radil, Lukáš (advisor)
This master thesis is focused on issue transimission system of Czech republic after 2040. Thesis is divided in two parts, teoretical and practical. Teoretical part contains present trends of transmission sytem and the most probably changes in the future decade. Practical part contains simulation of Czech transmission system and various scenarios with idea of open source.
Modelling and Simulations of Electromechanical Transients is Electrical Power Systems
Gromotovič, Ivan ; Bátora, Branislav (referee) ; Koudelka, Jan (advisor)
This work deals with the issue of evaluating transient stability in the simulation program PSCAD. Factors affecting transient stability were analyzed on a single-machine SMIB model. The results of this analysis confirmed the theoretical assumption that for more accurate results of the analysis of transient stability, it is necessary to consider the mentioned factors. A short circuit was simulated on the IEEE9 test model and subsequently the load angles of the generators were monitored using various methods. The method of reference of the largest generator in the system proved to be a more suitable method for the assessment of relative load angles from the results of the analysis.
History of protection relays
Šafl, Pavel ; Koudelka, Jan (referee) ; Bukvišová, Zuzana (advisor)
The bachelor thesis deals with mapping the origin and history of electrical protections. The work outlines the circumstances and the new types of protection. It expla-ins and introduces problems encountered in the development and operation of historical protections. On the overcurrent protection AB31, AT31 and REF615, the tripping characte-ristic was measured to evaluate and compare modern digital protection and historical electromagnetic protection. Dependent protection AB31 has been tested and measured for its dependent characteristics and the AT31 protection has been checked for short-circuit current capability. Both of these protections were compared and evaluated with the REF615 digital protection. The measurement results and calculations are processed into well-arranged tables and graphs that are part of the work. The last part of this thesis is the selection of suitable protections for describing and making small exposures.
History of protection relays
Šafl, Pavel ; Koudelka, Jan (referee) ; Bukvišová, Zuzana (advisor)
The bachelor thesis deals with mapping the origin and history of electrical pro-tections. The work outlines the circumstances and the new types of protection. It expla-ins and introduces problems encountered in the development and operation of historical protections. On the overcurrent protection AB31, AT31 and REF615, the tripping characte-ristic was measured to evaluate and compare modern digital protection and historical electromagnetic protection. Dependent protection AB31 has been tested and measured for its dependent characteristics and the AT31 protection has been checked for short-circuit current capability. Both of these protections were compared and evaluated with the REF615 digital protection. The measurement results and calculations are processed into well-arranged tables and graphs that are part of the work. The last part of this thesis is the selection of suitable protections for describing and making small exposures.
Comparison of short-circuit current calculations by simulation programs with the standard ČSN EN 60909 ed.2
Procházka, Jiří ; Koudelka, Jan (referee) ; Bátora, Branislav (advisor)
This master's thesis deals with the comparison of the short-circuit current calculation for a model example according to the standard IEC 60909-0:2016 with simulation programs. The first part deals with short-circuit in general together with an example of calculation of short-circuit currents. The next part of the master’s thesis deals with creating models of network elements by different simulation programs. The last part deals with dynamic simulation of model example together with programs settings. Finally, the results of simulations are evaluated.
Frequency Measurement In Pscad
Koudelka, Jan
The article deals with the issue of frequency measurement in PSCAD software. The objective is to assess frequency waveform in buses of the grid calculated by PSCAD when outage of one generator occurs. Two simulations respecting different electrical distance between buses were accomplished. Simulation results show the correct assessment of the influence of electrical distance between buses, however inaccurate calculation of frequency comparing to speed of generators. The main contribution is to point out that frequency calculated from voltage waveform can be incorrect, which can cause false operation of protective relays.
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.
Influence of celebrity endorsement on consumer behaviour of youth
Veis, Roman ; Koudelka, Jan (advisor) ; Vávra, Oldřich (referee)
This bachelor thesis deals with role of celebrities in advertising, involvement of celebrities in marketing communication and influence of celebrity endorsement on consumer behaviour. The aim of this thesis is to investigate the influence of the celebrity endorsement in advertising campaign on decisions of consumers, primarily at age from 19 to 26. Literature based theoretical part describes the term consumer, reference group, its types and an endorsement of celebrities in marketing. The practical part deals with content analysis of three different magazines, where is examined advertising using reference groups. Practical part is also focused on a survey that examines how celebrities influence behaviour of young people and how are celebrities in advertising perceived. In conclusion are compared results of content analysis and online survey, mentioned recommendation of celebrity endorsement for marketing orientation and summarised whole bachelor thesis.
The category management on the supplier´s side
Michálková, Eva ; Koudelka, Jan (advisor) ; Láska, Martin (referee)
The Master´s Thesis deals with the category management on the supplier´s side. The main objective of the thesis is to find the best shelf optimization for the selected categories. In the theoretical part there are defined the main terms and the category management process. The analytical part is then focused on the whole category management process in Albert. The analytical part is based on primary and secondary data. The primary data consists of quantitative questionnaire, observation and interview with customers. The secondary data are based on MML-TGI research, GfK reports and Nielsen reports. In the thesis there is a big emphasis on the customer shopping behaviour. At the end of the thesis there are given shelf proposals and recommendations to the retailer.

National Repository of Grey Literature : 342 records found   1 - 10nextend  jump to record:
See also: similar author names
4 KOUDELKA, Jaroslav
2 Koudelka, Jakub
4 Koudelka, Jaroslav
3 Koudelka, Jiří
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