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Partial Discharges Detection and Spatial Localization in High Power Transformers Using UHF Method
Čáp, Martin ; Král, Bohumil (referee) ; Zemánek,, Ivan (referee) ; Drexler, Petr (advisor)
The thesis discusses the design and experimental verification of a new method for detecting partial discharges in oil-cooled high-power transformers, emphasizing the origin of the measured signal from the outer and inner regions of the transformer tank. The detection and spatial localization of partial discharges utilizes UHF (Ultra High Frequency) electromagnetic signal measurement. The UHF partial discharge detection method, also referred as UHF PD, is one of the most advanced techniques for the accurate spatial localization of the signal source position. The focus of the thesis lies in the development of technical and software solutions for the separation of partial discharge signals originating from the internal space of the transformer and the spurious signals from the connection lines. The proposed technical and program solutions constitute a signal discriminatory method. The precise and repeatable diagnostics of the transformer state are guaranteed by observing the measurement methodology and special setting of the diagnostic system. The functionality of the signal discriminatory method was verified during real measurement of the oil-cooled power transformers at the Dukovany nuclear power plant in operation. The output of the designed methodology is to set up a calibration procedure and follow-up steps to ensure objective, repeatable, and comparable measurements for the purposes of regular predictive maintenance in transformers.
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Switchable filter for UHF band
Sedlák, Milan ; Čáp, Martin (referee) ; Drexler, Petr (advisor)
The bachelor thesis deals with the design of multi-channel switchable filter for ultra high frequency band. The theoretical part focuses on a basic features and principles of the realization of frequency filters and high frequency switches. The practical part focuses on the selection of appropriate components and complete design of switchtable signal filter.
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Design and Realization of Phantom for MRI
Šablatura, Martin ; Čáp, Martin (referee) ; Nešpor, Dušan (advisor)
Paper studies the principles of MRI and composition of MR system. Main part of thesis focuses on design, mixing and measurement of solution for MR system phantom. Teoretical part of paper focuses on problematic of MRI and phantoms for MR system, including description of specific phantom, which is then realised. Paper contains methods for designing proposed kind of phantom and its followed measurement. Part of paper also focuses on mathematical models of elaboration of data aquired from measurements.
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Controllable Current Source for High Power LEDs with the Use of Arduino Platform
Čáp, Martin ; Škoda, Jan (referee) ; Toman, Marek (advisor)
This bachelor thesis deals with regulation of brightness power LED diodes and design of the control circuits. Here is described how in environment Delphi to create an application to control PWM Arduino outputs. They are discussed linear and switching current source. Also are described specialized switching power supplies to power the LEDs. The aim of this work is the design, realization and comparison of linear power supply, switching source assembled with the TL494 and integrated switchied current source TPS92513.
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Monitoring Trends of Electrical Activity of the Heart Using Time-Frequency Decomposition
Čáp, Martin ; Kozumplík, Jiří (referee) ; Provazník, Ivo (advisor)
Work is aimed at the time-frequency decomposition of a signal application for monitoring the EKG trend progression. Goal is to create algorithm which would watch changes in the ST segment in EKG recording and its realization in the Matlab program. Analyzed is substance of the origin of EKG and its measuring. For trend calculations after reading the signal is necessary to preprocess the signal, it consists of filtration and detection of necessary points of EKG signal. For taking apart, also filtration and measuring the signal is used wavelet transformation. Source of the data is biomedicine database Physionet. As an outcome of the algorithm are drawn ST segment trends for three recordings from three different patients and its comparison with reference method of ST qualification. For qualification of the heart stability, as a system, where designed methods watching differences in position of the maximal value in two-zone spectrum and the Poincare mapping method. Realized method is attached to this thesis.
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