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Development of grounding enhancing cement composite mixture
Sochor, David ; Dohnálek,, Pavel (referee) ; Drochytka, Rostislav (advisor)
The diploma thesis deals with the development of a conductive cement composite grounding mixture for protection of building structures in areas with low conductivity. The theoretical part is focused mainly on the methods of buildings protections against lightning and overvoltage. The aim of this is to create a conductive composite with the possible use of secondary raw materials, which have a low electrical impedance value. The conclusion of the thesis is devoted to the evaluation of the efficiency of newly designed conductive composites and their possibility of incorporation into building protection systems against lightning or overvoltage.
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Conscious management of expressivity
Shvachko, Elizaveta ; KUDLÁČKOVÁ, Jana (advisor) ; HLAVICA, Lukáš (referee)
Thesis deals with conscious management of expressivity on stage. Firstly the author of the thesis name basic issues related to psychical and physical tension during performance, secondly the author defines basic terminology related to tention and jitter. The core of this work is application of knowledge acquired during studies at DAMU, during first experiences of performances in front of audience during studies and also acquired from first experiences from professional environment of theatre and film. The author also analyzes her personal themes related to her own personality as possible obstacles in order to do acting profession.
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Proposition of grounding enhancing cement composite mixture
Sochor, David ; Bydžovský, Jiří (referee) ; Drochytka, Rostislav (advisor)
The bachelor thesis deals with the design of a conductive cement composite grounding mixture for protection of building structures in areas with low conductivity. The theoretical part is mainly focused on summarizing the knowledge of the current protection of buildings against lightning and overvoltage. The study includes knowledge in the field of conductive building materials and aims to present the design of a cement composite mixture to improve grounding. Choosing the right raw materials to achieve electrical conductivity. A maintenance-free material has been developed, no humidity needed material while maintaining conductivity. The work it examines the possibilities of using industrial wastes as secondary raw materials. The conclusion focuses on laboratory testing of newly developed materials, summary and discussion of the results. With the developed samples, the resistivity was greatly reduced. The positive effect of ferric dust and carbon particles has been demonstrated.
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High Speed Transients Modelling
Bukvišová, Zuzana ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
This thesis deals with the high speed transient modelling in the electrical networks. The introduction of this work discusses mathematical models of the individual devices used in the system and focuses on the line representation. It also contains a more detailed description of Bergeron and frequency dependent line model. The objective of this thesis is to design a network model using ATP-EMTP simulation program. In this model, the switching overvoltage caused by shunt reactor switching and lightning overvoltage are simulated. The thesis thoroughly describes the settings of the components used in the model of analysed network and in conclusion evaluates obtained simulation results in a relation to the insulation coordination.
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Surge in electrical networks and protection of electrical devices against surge
EFFENBERK, Kryštof
The bachelor thesis is focused to problems with surge. Different kinds of surge are distinguished in the introduction. Specifically it deals with the atmospheric surge and switching surge. Further on it describes surge waves and their propagation along lines of low voltage. The next section is focused on blueprints of signal generator. In a later section the author moves to the basic level of surge protection and surge protection devices. Last part of the bachelor thesis researches place, where we can plant surge protection devices. It also explains the behavior of the surge waves at interfaces of different impedances.
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Application of surge protection in LV networks
Brtnický, Pavel ; Šlezingr, Jan (referee) ; Bátora, Branislav (advisor)
The work include the issues about surge protection in low voltage networks. The first part give a theoretical analysis of the surge protection, where is described own creation and basic division. The second part give a inner and outer protections, where is characterized, what protections contain and methods, with which to design protection. In the third part is few words about computer softwares, which supports dimensioning and design protections. The second half of the work give a specific design of protections for fire station, first there are determinated risks for building without surge protection and after for building under surge protection, design of outer protection together with verification and design of inner protection.
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Fast Transient Phenomena in High Voltage
Vala, Martin ; Dohnal, Petr (referee) ; Krbal, Michal (advisor)
This work deals with research and description of the fast transients in high voltage technics. First part deals with division of fast transients and description of an impulse wave properties. Second part is focused on atmospheric overvoltage description and on direct and indirect lightning surge protection methods. Next, there are described the main characteristics and division of the surge protection devices in the work. In the next part, there are introduced some sort of high voltage generators, used for meassurement of impulse wave in a transmission line. In the last part there is stated an analysis of practical measurement of impulse weaves and surge arresters by using a Marx generator.
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Application of overvoltage protection in LV networks
Knebl, Jan ; Novotný, Jan (referee) ; Bátora, Branislav (advisor)
This paper describes the design of surge protection for objects of civil construction. The aim of this paper is to acquaint the reader with the problems of this region, which is nowadays especially for houses neglected. The introductory part of the thesis is focused on the theoretical analysis of the problem and become familiar with the standards in force, without which a person moving in this field certainly can not do. In the first major section is a repartition surge in general terms. In the second chapter, a repartition of surge protection on the inside and outside and a description of the individual components of these protections. The third chapter is made complete design protection for the school building, the first step is an analysis of the risks to unprotected building, then the protected and ultimately design of internal and external surge protection. In the last chapter, a check is made of the risk analysis using DEHN Support.
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The design of the lightning protection for the house
Tesař, Luděk ; Bátora, Branislav (referee) ; Toman, Petr (advisor)
This work describes the design rules for the lightning protection of civic construction. The aim of this work is to provide a comprehensive view of the basic design rules for the lightning protection. The actual design is preceded by the detailed introduction to the relatively large problems in this sphere. The introductory part is focused on the approach of technical standards and legislative requirements. In the second chapter the thesis deals with lightning in general and lightning current and its parameters. The following chapter focuses on the effects of lightning current, indicating the damage caused by lightning strikes to the building or its surroundings. Then the thesis deals with analysis and risk management. The next chapter describes and explains the system of external and internal lightning protection. The last part is devoted to a specific design of the lightning protection for the chosen house.
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