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Differential Protection for Power Transformer
Bukvišová, Zuzana ; Wasserbauer, Vojtěch (referee) ; Orságová, Jaroslava (advisor)
This thesis explores power transformer protection and focuses on differential protection. It attempts to explain its principles and operating characteristic settings. The measurement was executed on devices SPAD 346 C and REF542plus, which can be used for differential protection. At the end, there is a comparison of results of operating characteristic measurement on both devices. Their function was tested at different cases, specifically when the differential current occurs in all phases or just one. The thesis includes a comparison of reaction times under fast increase of current. OMICRON CMC 256 plus was used as the test device. The data obtained by the measurement are processed in tables and charts.
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Analysis of the electrical power measurement system in the local distribution network Pod Palackého vrchem
Hájková, Barbora ; Orságová, Jaroslava (referee) ; Jurák, Viktor (advisor)
The diploma thesis introduces a detailed analysis of the local distribution system (LDS) Pod Palackého vrchem (PPV) in the Brno, parameters of power transformers and cable routes between them. The elements of the electrical network that are influencing the balance of reactive power are described along with its sources and appliances. In the next part is defined the present concept of long-term measurement in the LDS by using current and voltage sensors. This part deals with calculations of power losses in the power transformers and the cable lines together with uncertainties concerning power measurement in the field of energetics. The essential part of the thesis focuses on the analysis of the temporary measurement implementation in the LDS, data processing along with the comparison of measured values from temporary measurement with values from permanent measurement. In conclusion, the error of the system is determined.
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Projet of reconstruction of the 22 kV incoming substation and the cable network in the faculty hospital campus
Komárek, Filip ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This master's thesis deals with the area hospital distribution networkand one of the hospital's entry substation. The first part of this master's thesis deals with the project of the new cable network, her gradual revival without any power outages at the collection points. Futher, in this thesis is project of temporary transformer station for supplying power during the reconstruction of the HV switchboard. Subsequently, in this thesis is project of the new HV switchboard in one of the entry substation. new HV switchgear and a new HV substation were projected. Futher, in this thesis is proposed compensation of the whole area, including the HV network.
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Theory and practice of fault location on MV cable lines in E.ON distribution networks
Macků, Dominika ; Holub, Martin (referee) ; Orságová, Jaroslava (advisor)
This thesis gives an overview on the fault of high-voltage cable transmission lines in the distribution system of the E.ON company. The first part of this thesis introduces reader to the topic of cable transmission lines, types of commonly used cables and the most commonly occurring faults. In the second part of this thesis, the methods of locating faults in cable transmission lines by professional personnel are explained. The third part deals with the analysis of a group of chosen occurred faults. The final part focuses on the statistics of fault occurrence on South Moravian region from 1.1.2017 until 1.1.2019.
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Design of 22 kV Cable Network in the Existing Complex of Faculty Hospital
Blažek, Tomáš ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This thesis describes the reconstruction network 10 kV HV networks in a teaching hospital in the transition to a new 22 kV voltage level according to valid regulations. The paper describes the current state of technological equipment and its gradual replacement with new technology at 22 kV voltage level in each power units so as not to limit the operation of the hospital. For this purpose, the new backup system for rotating spare resources. The thesis deals with new input distribution, which will serve as a transfer point between the customer and distributor of electricity as well as advance the existing technological equipment.
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Negative-Phase-Sequence Protection of Generator
Babík, Peter ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
This bachelor thesis deals with the effect of unbalanced load on a generator and principles of its protection. At first the characterization of operating failures and generator's abnormalities are described. Further the analysis of unbalance in electric system and its effect on the generator is presented, especially the effect of negative phase sequence on the armature. The end of the theoretical section deals with the principles of unbalanced load protection. In the practical part the punctual characterization of used apparatus is presented, namely the machine terminal REM 543 and a tester Omicron CMC 353. Furthermore the individual settings of each apparatus are discussed along with the testing of chosen negative phase sequence protection.
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Testing of Control and Logic Functions of Feeder Terminal
Kaplanová, Klára ; Paar, Martin (referee) ; Orságová, Jaroslava (advisor)
This work occupies itself with an analysis of operational manipulations in the feeder terminal of the distribution system and it considers the configuration of its apparatus equipment with the following configuration of the logical operations for controlling the apparatus in the feeder terminal. Further, this work occupies itself with switching high voltage equipment, their qualities and distribution, with their electrically driven mechanism, including the method of their control. Moreover, the work is aimed at the configuration of the logical operation with the aid of the Boole functions for controlling the feeder terminal apparatus within the CAP 505 software, and at its following testing on the REF 543 terminal from the ABB Company. The aim of the work is theoretical analysis of controlling and operational manipulations in a high voltage distribution system, the following creation and registration of the blocking conditions as well as with their use to create a functional configuration of the feeder terminal of the distribution system and its testing on the demonstration panel which is set with the REF 543 terminal and with further apparatus equipment that simulates the complete high voltage distributor. In the factory configuration the simulation is carried out by the LOGO! module from the Siemens Company. Therefore, our further aim is to design and subsequently to connect the feeder terminal so that the controlling and signaling panel elements could be connected directly to inputs and outputs of REF 543 terminal and could so enable its controlling and checking of the operation conditions. The main aim of the work is to elaborate a detailed description of the functional configuration creation as well as the following REF 543 terminal adjustment for testing the blocking conditions.
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Measuring system for laboratory generator unit
Pochop, Zbyněk ; Ptáček, Michal (referee) ; Orságová, Jaroslava (advisor)
This Master thesis deals with the measurement and description of the synchronous generator , which is located in laboratories. First, the thesis deals with the theory of synchronous machines. This is followed by a detailed description of the involvement of laboratory genetatory unit. Subsequently, the work deals with the measurement of basic parameters of the synchronous machine and also quite thoroughly devoted to displaying transients at various levels on the digital oscilloscope. The dissertation aims to compare theoretical ideas with the measured results. Finally, it is shown what could be measured next to the generator set.
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Overhead Line Protection against Climatic Effects
Sýkora, Martin ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
The outdoor overhead lines are influenced by additional load pressure of wind and frost. These can have adverse reaction on outdoor conduction of the electric power. My bachelors' report deals with separate climatic effects and possibilities of their resolution. It it also concentrates on removing the negative influences caused particularly by wind and on the possibilities of liquidation of the frost that had already originated.
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Model of Electrical Station with IEC 61850 Communication Protocol
Stodůlka, Ivo ; Majer, Karol (referee) ; Orságová, Jaroslava (advisor)
The amount of information transmitted in automation systems has grown exponentially, since the modern digital protection and control devices had been introduced. These systems with different features, limited data flow and the mutual incompatibility were mostly based on the principles defined by vendors themselves. The international communication standard IEC 61850 was created with the aim of introducing definite rules and the structure into the communication part of the electrical substations with the application of the latest technologies. This standard also emphasises the mutual interoperability of the different vendors´ devices. This thesis is focused on the comprehension of basic principles, the practical application and the testing of digital protections with IEC 61850 communication standard implemented. The first part of my thesis is a theoretical one and describes basic principles, services and possibilities of the abstract communication model defined by IEC 61850 standard. The second part of my thesis describes the configuration of IEC 61850 communication standard of the protective terminal REF 542plus with the partial support of this standard including only the vertical communication and the subsequent testing using the OMICRON's testing tool IED Scout. The third part of my thesis is focused on the configuration of the feeder protection REF615 which has fully implemented IEC 61850 standard covering both vertical and horizontal communication by means of the GOOSE messages and the subsequent testing using the ABB's testing tool ITT600 SA Explorer. The testing of both protective devices was carried out in the laboratory of the protection relays on the testing panels at ABB PPMV Brno. The conclusion summarizes the contributions of IEC 61850 communication standard and there are also compared the engineering procedures of the protective terminal REF 542plus and the feeder protection REF615.
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