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Simulation of Effects of Short-circuit Currents in HV Switching Stations
Tománek, Miloslav ; Buriánek, Jiří (referee) ; Toman, Petr (advisor)
This thesis is engaged in a theoretical calculation of short-circuit currents in electric power system in compliance with the norm ČSN 60909-0 and first of all with calculation of dynamical and thermal effects of short-circuit currents in HV switching stations in accordance with the norm ČSN 60865-1. Next the thesis is engaged in a production of programs for simulation of mechanical effects of short-circuit currents with respect to a dimensioning of constructional elements of switching station and afterwards in a practical simulation of selected parts of the real switching station type „H“ in Slavkov u Brna.
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Stabilized operation of a 400 kV power line
Girga, Eduard ; Špaček, Jaroslav (referee) ; Blažek, Vladimír (advisor)
Electrical wiring 400 kV is the most used transfer wiring in the Czech Republic with length over three thousand kilometers. It is frequently used for running out significant output from the big power plants and for its significance in electrical engineering. Theoretical part of this thesis deals with the cross-section of mainly used methods for high and extra high stable wiring voltage solution. These methods can be generally dividend into precise and rough. Both of these methods will be analyzed in next chapters. Exact solution comes out from the presumption of equally spaced parameters. The rough solution uses substitution of double gates wiring, this method is accurate enough and accelerates the calculation. Former mentioned reasons explains it’s often use in technical practice. The electric line is substituted by T-cell, II-cell or Steinmetz cell according to length and required precision. Special method of rough solution is the broad method which enables to solve randomly knotted network by using II-cell to replace electric wiring between single knots. This method is mentioned in thesis for completeness; the network solved by me is not knotted. Part of the theoretical thesis is the analysis of specific transfer cases. In computing part will be mentioned not only the computation of stable wiring state with precise an rough method - with all former mentioned cell but the computation of specific transfer cases as well. In the end will be concluded all the counts from computing part and from precision view evaluated used methods of the stable wiring solution.
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Tissue impedance measurement
Nejezchleba, Zdeněk ; Rampl, Ivan (referee) ; Chmelař, Milan (advisor)
Bachelor thesis deals with the measurement of resistance of the skin with direct current. It describes the changes in the value of time, depending on the emotional stability of the human and his psychological habit. It is a method able describe the relatively objectively and compare human emotions.
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Porovnání sezónních změn v distribuci impedance dřeva a sestavení vzorníku pro vyhodnocování snímků elektrického impedančního tomografu
Chmel, Ladislav
The bachelor thesis deals with physical principles of the electrical impedance tomograph Picus (EIT). Moisture distribution in different tree species, norway spruce (Picea abies), silver birch (Betula pendula), pedunculate oak (Quercus robur) and thein seasonal change. Measurement is always carried out on the same thirty trees, fifteen trees from the urban environment and fifteen trees from the forest environment. Tomography measurements are proceed every month of the year, I have drawn up a swatch tomography from these results to evaluace images made by the device. Changes distribution of the impedance wood are compared among the tree Gross and thein habitats.
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Problems and measurements of the basic electrotechnical quantities
BOHÁČ, Radek
The purpose of this thesis is selection and specification of basic teaching methods used in heavy current laboratory during vocational training education at secondary school. Basic methods for electrical values measurements in heavy-current laboratory, measuring instruments basic division and measured electrical values evaluation. Further, basic measurement of electrical values, current, voltage, power, resistance and capacity are specified here.
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