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Model of Test System 300 kV
Bukva, Michael ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The aim of this thesis is to analyze and evaluate an alternating current testing system with a voltage of 300 kV, located at Professor List's Science and Technology Park. The work focuses on describing the construction of this system, its functional parameters, and its practical application for various types of high voltage tests. A key aspect of the analysis is the assessment of the quality of the output signal from the source and the identification of factors contributing to total harmonic distortion (THD) and crest factor (CF). The study examines the impact of transformer design features, temperature, switching currents on harmonic distortion. Based on the measured values, optimal operating conditions were defined and mathematical models were developed to predict the system's behavior under various operating conditions. The results of this work also include software that serves as support for the operators of the testing system.
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MV Cables Failures and Malfunctions
Holuša, Martin ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The aim of this diploma thesis is to define cable and his accessories and describe defects and fault which can appear on the cable and his accessories. The thesis also divides the cable and his accessories into individual parts, which are describe in more detail. Diagnostic methods that can be used to detect individual faults and monitor their status on individual parts of the cable and cable accessories are also listed. The thesis's practical part focuses on the test of one component of the cable assembly using PD measurement and monitoring its surface temperature.
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Generation of Voltage Wave by Impulse Generator
Poloni, Miroslav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
The presented bachelor thesis deals with the problems and functions of impulse voltage generators. The theoretical part describes the functions and various connections of the impulse generator, types of impulse voltage, tests and test procedures. In the practical part of the work, theoretical knowledge in the form of simulations was verified. The simulations were performed in the LTspice program from Linear Technology, where the impulse generator model was made. Simulations were then performed on the given model of the shock generator, from simpler ones such as the dependence of the size of the load capacity to the inductance connected in parallel. The results of all simulations should bring benefits and ease in real shock generator tests
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Breakdown Voltage Measurement of Solid and Liquid Dielektric Materials
Ryšavý, Tomáš ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
This thesis aims to theoretically describe the formation of electric breakdown in solid and liquid dielectric materials and subsequently focuses on the measuring itself. In addition to describing the standardized procedure of electrical breakdown or breakdown voltage of dielectric materials, this paper also focuses on the most important parameters and conditions that affect the electric strength of materials. This thesis also includes designs of electrode systems and test chambers for measuring solid and liquid dielectrics.
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Thermal degradation of insulation materials from the cable industry
Kučera, Filip ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
The aim of this bachelor thesis is to get acquainted with the properties and parameters of insulation materials of various types (PVC, PE). Measure these properties with a Tettex 2830/2831. Perform a theoretical analysis of the aging of insulating materials and propose a procedure for the formation of thermal degradation. Finally, find out how the properties of insulating materials, electrical strength and mechanical properties change due to thermal degradation.
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Testing of MV Distribution Transformers
Czajtányi, Róbert ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The aim of this thesis was to get acquainted with the electrical properties of distribution transformers, which are used in the area of high voltage technology. Further aim was to describe the existing diagnostic methods according to the standards and to introduce the measuring workstation. Finally, the diagnostic of transformer was performed, and the results were evaluated.
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Design of Measuring and Recording System for 100 kV AC/DC Haefely KIT
Sirotsin, Aliaksandr ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
This bachelor thesis is devoted to the design of a measuring and recording system for a 100 kV construction KIT. It describes the Haefely KIT 100kV, reveals the analysis of the principle of the operation of the measuring instrument DMI 551 and the design of the measuring system. In addition to it this work presents the calculation of harmonic distortion, ripple, peak, mean and rms values from the measured data and their measurement. The practical part of the thesis is completed with verifying the individual functional parts of the measuring system, including calibration.
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Surge arresters, their construction and use in power system
Novický, Marek ; Pelikán, Luděk (referee) ; Orságová, Jaroslava (advisor)
The bachelor thesis deals with the means used to protect the equipment from the effects of overvoltage. The first of the thesis outlines basic information regarding the used overvoltage protections in the distribution system. The thesis also features the practical part outlining measurements carried out on the surge arrester. The last chapter deals with the dimensioning of the surge arrester in the high voltage distribution system.
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Measurement of HV equipments by electronic bridge.
Kumičák, Ivan ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The main idea of this thesis is measurements of dielectric materials by using a device Tettex. The thesis is about basic physic properties of dielectric materials. The determination of a dielectric material is considered. The behavior of these materials in electrical fields and reasons, those can have an influence on it, are considered as well. In the text are described measuring methods of chosen parameters of dielectric materials by device Tettex and its functional principles. There are an evaluation of measurements, which were done, and a discussion about achieved results.
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