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Diagnostics of rotating electric machines
Soukup, Patrik ; Mach, Martin (referee) ; Janda, Marcel (advisor)
The thesis Diagnostics of rotating electric machines deals with the theory of diagnostics of rotating machines, focusing especially on the diagnosis of asynchronous motors of high power. Due to the importance of maintaining the trouble-free condition of these machines with regard to serviceability, the importance of their diagnosis is growing. Due to inappropriate working conditions or for many other reasons, different types of malfunctions may occur in the machine. The list and the way of occurrence of possible failures are included and explained in this thesis. With the growing age of the machine, it is important to check the insulation status through insulation testing. These tests are performed in the practical part of the thesis and the results are presented. In the case of asynchronous machines, each anomaly leaves a signature in the form of an electrical, magnetic or vibrational signal. These signals are analyzed and evaluated using a specific measuring equipment with the intention of deciding on the current state of the machine. Motor current signature analysis (MCSA) is considered to be the main diagnostic method of asynchronous machines in this thesis. This method is described in detail in this paper and is being applied in electrical engineering.
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Diagnostics of rotating electric machines
Soukup, Patrik ; Mach, Martin (referee) ; Janda, Marcel (advisor)
The thesis Diagnostics of rotating electric machines deals with the theory of diagnostics of rotating machines, focusing especially on the diagnosis of asynchronous motors of high power. Due to the importance of maintaining the trouble-free condition of these machines with regard to serviceability, the importance of their diagnosis is growing. Due to inappropriate working conditions or for many other reasons, different types of malfunctions may occur in the machine. The list and the way of occurrence of possible failures are included and explained in this thesis. With the growing age of the machine, it is important to check the insulation status through insulation testing. These tests are performed in the practical part of the thesis and the results are presented. In the case of asynchronous machines, each anomaly leaves a signature in the form of an electrical, magnetic or vibrational signal. These signals are analyzed and evaluated using a specific measuring equipment with the intention of deciding on the current state of the machine. Motor current signature analysis (MCSA) is considered to be the main diagnostic method of asynchronous machines in this thesis. This method is described in detail in this paper and is being applied in electrical engineering.
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Proposal for a continuous monitoring system of power transformer
ROZMILER, Jiří
Work deals with the description of the purpose of installing continuous monitoring of power transformer oil, familiarization with the principle of its operation, including a description of monitored and evaluated variables. Furthermore, there is given a brief overview of the history of the use of these systems in the Czech Republic, the current state of technology offered, compared different methods of measuring key variables and their visualization. The aim of this work is not only to provide a comprehensive insight into this issue, but also check the results provided a continuous monitoring system in other ways to monitor parameters of power transformer. Results and the suitability of different systems and methods measurements is evaluated in the final chapter.
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Use of on-line diagnostic tools in selecting employees
Dufková, Klára ; Šikýř, Martin (advisor) ; Coubal, Václav (referee)
This thesis deals with the possibilities of using on-line diagnostic tools in selecting employees. The theoretical part of the thesis summarizes the theoretical basis for selection of employees, psychodiagnostics and on-line diagnostics. Attention is paid to psycho diagnostic characteristics and determination of preferences and risks of on-line diagnostics. The practical section examines and assesses the individual tools on-line diagnostics available for selection of employees on the Czech market - specifically, by the company Access Assessment s.r.o., Assessment Systems s.r.o., cut-e czech s.r.o and www.SCIO.cz, s.r.o. The tools are evaluated on the basis of psychometric features, factor is the standardization, objectivity, reliability and validity, as these characteristics determine the quality of the questionnaire or test. The result is a recommendation of an on-line questionnaire and tests that are for standard practice in the selection procedure most applicable.
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