Thesis /

ROMDOC-THESIS-2010-005

MONITORIZAREA MAŞINILOR ŞI APARATELOR ELECTRICE UTILIZÂND SISTEMELE DE ACHIZIŢII DE DATE

SAMFIROIU, Dorian
2007-01-01

Abstract: The thesis gradually presents all the theoretical and practical knowledge (concepts, general purpose information of the specific technical domain, electrical, needed in the field, electric design, examples of application software) needed for monitoring the electrical machines and apparatus. Also, the work presents a new mathematical method for the digital processing of the signals acquired by transducers and for determining the features of interest (the signal amplitude at specific frequencies and origin angular magnitude). The monitoring concept and searching failures algorithms for asynchronous motors with in short-circuited rotor and tri-phased transformers are analyzed in the thesis. The author presents a synthesis of the knowledge in the field of analog-digital and digital-analog converters, the types of encountered errors and the types of communication interfaces. The author brings an original contribution by the design and implementation of a digital-analog converter without communication interface, that can be used with any micro-controllers which has no digital-analog converters incorporated. The author has conceived a set of 7 criteria for selecting LEM transducers, used for electrical measuring. In the third chapter the author presents a personal contribution (hardware and software) in the concept, design and implementation of the equipment used for monitoring the electrical machines and apparatus functionality (2 equipment, one for electrical machines and one for hard current connecting/disconnecting devices). The thesis also includes the description of a dispatch system architecture for oil fields and the results obtained after the monitoring of the component electrical machines and apparatus in exploit in Tasbulat, Kazahstan. For an easier and faster processing of the signals originated in the analog-digital converters the thesis proposes an original method, other than Fast Fourier Transform. The new method has obvious advantageous features: it is faster, iterative, needs minimal hardware resources, easy to be implemented on general purpose micro-controllers, may be used in real time applications.

Keyword(s): Diagnoză tehnică -- Maşini electrice -- Aparate electrice -- Teze ; Monitorizare tehnică -- Teze ; Achiziţii de date -- Sisteme -- Teze
Note: Author eng. Dorian SAMFIROIU, scientific leader Prof. dr. eng. Constantin GHIŢĂ

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