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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Indicador de inconformidades em instala??es el?tricas de baixa tens?o

Lima, Alfredo Rodrigues de 28 January 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-12T17:04:52Z No. of bitstreams: 1 AlfredoRodriguesDeLima_DISSERT.pdf: 1909195 bytes, checksum: 8680571905f085a9a3f6def1f176e2db (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-19T21:51:52Z (GMT) No. of bitstreams: 1 AlfredoRodriguesDeLima_DISSERT.pdf: 1909195 bytes, checksum: 8680571905f085a9a3f6def1f176e2db (MD5) / Made available in DSpace on 2016-07-19T21:51:52Z (GMT). No. of bitstreams: 1 AlfredoRodriguesDeLima_DISSERT.pdf: 1909195 bytes, checksum: 8680571905f085a9a3f6def1f176e2db (MD5) Previous issue date: 2016-01-28 / Com o avan?o da tecnologia de equipamentos, das formas de gera??o e utiliza??o de energia, os par?metros de qualidade de energia passam a influenciar de forma mais expressiva os diversos tipos de cargas consumidoras. Atualmente, s?o muitos os tipos de equipamentos que analisam a qualidade de energia. Entretanto, existe a necessidade de criar dispositivos que, al?m de realizar medi??es e calcular par?metros, encontrem falhas, sugiram altera??es, e possam dar suporte ao gerenciamento da instala??o. Al?m disso, ? necess?rio garantir que tais dispositivos sejam acess?veis. Para manter esse equil?brio, deve ser utilizado um m?todo de medi??o de grandezas que n?o requeira grandes recursos de processamento ou de mem?ria. O trabalho mostra que aplica??o do algoritmo de Goertzel, em compara??o com a comumente utilizada FFT, permite que as medi??es sejam feitas utilizando menos recursos de hardware, disponibilizando espa?o na mem?ria para implementa??o de fun??es de gerenciamento. O ponto inicial do trabalho consiste na pesquisa dos dist?rbios que s?o mais frequentes para consumidores de baixa tens?o. Em seguida ? proposto o diagrama funcional que indicar? o que ser? medido, calculado, quais problemas ser?o detectados e que solu??es podem ser encontradas. Simulando o algoritmo de Goertzel atrav?s do Scilab, mostra-se que ? poss?vel calcular componentes de frequ?ncia de um sinal distorcido com resultados satisfat?rios. Finalmente, ? montado o prot?tipo e s?o realizados os testes, ajustando os par?metros necess?rios para que se consiga manter o dispositivo confi?vel sem aumentar seu custo. / With the progress of devices technology, generation and use of energy ways, power quality parameters start to influence more significantly the various kinds of power consumers. Currently, there are many types of devices that analyze power quality. However, there is a need to create devices, and perform measurements and calculate parameters, find flaws, suggest changes, and to support the management of the installation. In addition, you must ensure that such devices are accessible. To maintain this balance, one magnitude measuring method should be used which does not require great resources processing or memory. The work shows that application of the Goertzel algorithm, compared with the commonly used FFT allows measurements to be made using much less hardware resources, available memory space to implement management functions. The first point of the work is the research of troubles that are more common for low voltage consumers. Then we propose the functional diagram indicate what will be measured, calculated, what problems will be detected and that solutions can be found. Through the Goertzel algorithm simulation using Scilab, is possible to calculate frequency components of a distorted signal with satisfactory results. Finally, the prototype is assembled and tests are carried out by adjusting the parameters necessary for one to maintain a reliable device without increasing its cost.

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