<p> The thesis is concerned with the design and construction of an instrumentation system for a machine set in a power laboratory. As the system was designed primarily to replace conventional analog metering its operation is very easy to master given minimal instruction. The system is capable of measuring rotor speed, rotor angle and reactive torque. From these values mechanical power and slip are calculated. While acting as a measuring instrument the system can also simultaneously provide speed setting of a dc machine by means of a controlled rectifier. As this system is constructed around a microcomputer it is possible to expand some of the functions as well as interconnect to other digital devices for enhanced performance.</p> / Thesis / Master of Engineering (MEngr)

A 16-level instrument in which the input voltage is sampled and quantised to yield direct decimal readouts of 1/T∫v^2dt . and T is described. This is an improved version of an instrument previously constructed; The upper frequency limit has been extended from 5 Hz to about 2 kHz. The readout of the instrument can be in any code, the decimal code being implemented in the instrument described. The original error analysis has been extended. An extensive analysis of the overall error characteristics was carried out theoretically and the results were confirmed experimentally. The instrument is capable of measuring the mean square value of periodic waveform to within 2%. Normal distribution noise of standard deviation between 1V and 3V can be measured with similar accuracy. The accuracy and the upper frequency limit are determined by the ' aperture time'of the sampling process. The errors arising in the sampling instrument depend on the number of levels used. / Thesis / Master of Engineering (MEngr)

No description available.

There is so far no consensus on how to develop a reliability model of safety-related digitalinstrumentation and control (I&amp;C) in a probabilistic safety assessment (PSA) of a nuclear powerplant. The objective of this thesis is to evaluate different approaches to model digital protectionsystems in a PSA for a nuclear power plant. This is accomplished by the development of a fault treemodel of the digital protection system for a fictive and simplified nuclear power plant, that act as areference model to be used for evaluation of different design alternatives and modelling principles.Common cause failures and spurious actuation signals are the major contributors to scenariosresulting in a core damage. A PSA model has to be sufficiently detailed in order for this to berepresented in the results. The impact on results such as core damage frequency and importance ofminimal cut sets from different fail-safe, voting logic and signal validation designs are significant,too. To further examine the differences between I&amp;C designs and significance of different PSAmodelling solutions, the degree of realism of the example should be increased. This rapidlyintroduces complexity to the models resulting in a model that is more difficult to review and resultsthat is more difficult to interpret and even much simplified models tend to get rather complex.

Orientador: Elnatan Chagas Ferreira / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-07T03:58:41Z (GMT). No. of bitstreams: 1 Chella_MarcoTulio_D.pdf: 2365952 bytes, checksum: 852ae94b1b87118845601034f0585269 (MD5) Previous issue date: 2006 / Resumo: Este trabalho apresenta uma arquitetura para o desenvolvimento de experimentos controlados remotamente via rede Internet com enfoque em aplicações educacionais. Utiliza-se a rede Internet como infra-estrutura de comunicação, aplicativos e hardware específico para instrumentação baseada em computador, um sistema composto de placa eletrônica e aplicativos para controle e monitoramento de experimentos reais. Os experimento criados com a ferramenta apresentada possibilitam ao usuário com um computador conectado à rede Internet controlar e obter informações relacionadas ao experimento no qual ele está atuando / Abstract: This work presents an architecture for the development of remote controlled experiments over the Internet with aplication in educational environments. Internet is used as infrastructure of communication, software and the specific hardware for instrumentation based on computer, electronic circuits and software to control and monitoring of real experiments. The experiment created with the presented tool makes possible to the user with computer plugged on Internet control and get information on the experiment over control / Doutorado / Eletrônica, Microeletrônica e Optoeletrônica / Doutor em Engenharia Elétrica

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