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Input audio preamplifier used for laboratory measurements
Kučera, Ondřej ; Kaller, Ondřej (referee) ; Kratochvíl, Tomáš (advisor)
This article looks at pre-input low-frequency amplifiers for laboratory work. The task was to study, design and build a fully functional pre-input amplifier for use in low frequency audio technology. In each section, we will discuss the various preamps, which are classified according to signal processing parameters. The construction of each amplifier uses discrete components and operational amplifiers. The second part of the article looks at different measuring devices, such as input sensitivity, transfer characteristics and input impedance etc., which would form part of the amplifier.
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Voltage quality index for distribution systems voltage quality benchmarking
Hausner, Josef ; Topolánek, David (referee) ; Drápela, Jiří (advisor)
This Master’s thesis deals with design of a new method for voltage quality benchmarking using voltage quality index. This index should determinate total voltage quality in the power grid and compare voltage quality in different places. There is design of several algorithms which value measured parameters in this thesis. The best suitable algorithm is selected. Program for this algorithm was compiled in GUI Matlab. The algorithm is verified by using measured parameters in this program. The last part of this thesis is focused on possible usage of created algorithm.
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Operation of a distribution system with resistance welders
Zelený, Miroslav ; Šlezingr, Jan (referee) ; Drápela, Jiří (advisor)
This Diploma thesis deals with assessment of the influence of two fundamental types of resistance welders operation on chosen power quality parameters at the point of common coupling (PCC) of the power network. The assessed parameters of power quality are the total harmonic distortion of the supply voltage, asymmetry of the supply voltage and the level of short term flicker at the point of common coupling. The assessment is based on the comparison of the results of computer simulations done in PSCad 4.2.0 with the requirements of technical standards. The outcome of this thesis is the determination of allowable limits for physical and operation parameters for the general arrangement of a power distribution network and a resistance welder that should guarantee the power quality compliance.
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