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Dielectric Absorption of Electroinsulating Materials
Pavlinský, Branislav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
This bachelor thesis deals with the basic physical principles of dielectrics as well as the description of the phenomenon of dielectric absorption. The work presents diagnostic methods that use this phenomenon, based on the events taking place in the dielectric after the connection of DC voltage. Furthermore, the work deals with diagnostic methods for determining the state of insulation of various high-voltage electrical equipment. The work also deals with the properties and parameters of electrical insulating materials - specifically polymers. We obtain these parameters using the mentioned diagnostic methods. By knowing these parameters, we achieve enough information about the insulation to determine its condition and prevent possible damage.
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Partial discharge measurement of middle and high voltage cables
Pelikán, Luděk ; Wasserbauer, Vojtěch (referee) ; Krbal, Michal (advisor)
The main topic of this work is the analysis of the measurement of partial discharge measurements on high voltage cables. The thesis also deals with other measurements, including the measurement of the loss factor and the voltage retention and breakdown test. Part of the text describes the issue of partial discharge, its measurement by galvanic method and methods of elimination of disturbing influences that affect this method in terms of sensitivity and accuracy of the measured values. Thesis also describes the construction of the cables, their marking and the tests carried out on them. There is also a description of the cable terminals used for measuring, especially water terminals, which are designed for high voltages and which are carried out in the practical part of the thesis. The next part deals with problems prior to the commissioning of water terminals and their preparation for certain tests, including description and evaluation of the results of the measurements.
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SF6 Alternatives in Power Engineering
Hofrová, Klára ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
Sulphur hexafluoride is most widely used gaseous insulating medium. Its excellent electronegative properties make it practically unrivalled in the energy sector. However, due to its strong global warming potential and long lifetime in the atmosphere, it is considered one of the fluorinated greenhouse gases that the European Commission wants to restrict or ban completely. This has created a problem for companies that manufacture equipment with SF6. In this paper, the latest regulations of the European Commission are compiled. It also discusses the technical and environmental requirements that are placed on these gases. Last but not least, the alternatives and their properties are listed, followed by the results from the test cell.
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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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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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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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Issue Of Measuring Parameters Of Dielectric Materials
Pelikán, Luděk
This article deals with the problems arising in the electrical measurement of various dielectricmaterials used in power engineering. The article presents the basic quantities and theirmeasurement principles. It focuses mainly on parameters measurable in non-destructive measurements,such as volume resistivity, relative permittivity, and dissipation factor. The article draws attentionto the problems that may arise during the measurement and thus guides the reader on howto measure these parameters correctly. These problems and findings were gathered during severaldifferent measurements with different types of dielectrics.
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