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Implementation of automatic controls of electrical signals for the monitoring system of the Temelín Nuclear Power Plant
Mareček, Michal ; Novotný, Pavel (referee) ; Drápela, Jiří (advisor)
This bachelor's thesis deals with individual electrical devices for self-consumption, focusing on production blocks of the nuclear power plant Temelín, which are continuously monitored by the superior electrical monitoring system NEMES. A key element is the description of the areas of power output and self-consumption of the electrical blocks of the power plant, including the NEMES system, necessary for the design of automatic checks of the measured electrical signals reliability. Knowledge of the device concept and operating modes is crucial to the successful implementation of NEMES system signal checks in logical links and in view of deviations from the band of operating values. The subject of the thesis is to propose limits for all main electrical equipment together with blocking conditions for performing automatic checks of the reliability of the monitored signals by the NEMES system, which will be of great benefit to the end user - the operator of the Temelín nuclear power plant.
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Power Inverter Online Diagnostics
Knobloch, Jan ; Chlebiš,, Petr (referee) ; Drábek,, Pavel (referee) ; Klíma, Bohumil (advisor)
This doctoral thesis focuses on the problems of IGBT failure prediction in pulse converters using measurable changes of selected parameters (so--called trending variables) being influenced of transistor degradation during aging. Firstly the state--of--the--art in this field is presented in the dizertation. The description of designed and constructed automated measurement stand follows, enabling monitoring and recording of switching processes during accelerated aging. Further the problems of high--bandwidth measurement of electrical quantities during IGBT switching are described. Especially the problems of current sensing are analyzed and the most suitable sensor is selected. The data recorded using the developed apparatus served to identify potential trending variables allowing the failure prediction. Here the dependence of trending variables on aging and on parasitic influences (current, temperature, voltage) had to be distinguished. Finally the evaluation of trending variables is performed. Their insignificant sensitivity on accelerated aging is shown which complicates their practical implementation for the purpose of failure prediction.
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Power Inverter Online Diagnostics
Knobloch, Jan ; Chlebiš,, Petr (referee) ; Drábek,, Pavel (referee) ; Klíma, Bohumil (advisor)
This doctoral thesis focuses on the problems of IGBT failure prediction in pulse converters using measurable changes of selected parameters (so--called trending variables) being influenced of transistor degradation during aging. Firstly the state--of--the--art in this field is presented in the dizertation. The description of designed and constructed automated measurement stand follows, enabling monitoring and recording of switching processes during accelerated aging. Further the problems of high--bandwidth measurement of electrical quantities during IGBT switching are described. Especially the problems of current sensing are analyzed and the most suitable sensor is selected. The data recorded using the developed apparatus served to identify potential trending variables allowing the failure prediction. Here the dependence of trending variables on aging and on parasitic influences (current, temperature, voltage) had to be distinguished. Finally the evaluation of trending variables is performed. Their insignificant sensitivity on accelerated aging is shown which complicates their practical implementation for the purpose of failure prediction.
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