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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

Utiliza??o da frequ?ncia de 915 MHz para monitoramento e supervis?o de isoladores polim?ricos classe de tens?o de 500 kv

Silva, Huederson Aparecido Botura da 07 December 2012 (has links)
Made available in DSpace on 2016-04-04T18:31:37Z (GMT). No. of bitstreams: 1 Huederson Aparecido Botura da Silva.pdf: 9209159 bytes, checksum: 19951a63245110738c893753fdd3874c (MD5) Previous issue date: 2012-12-07 / In an eletric power transmission system, the insulators are directly associated with the security level of the web, which your fail influence on companies statistics. The polymeric insulators are become more utilized year after year, having numerous advantages to its competitors (glass and/ or porcelain), however, its useful life can not be determined yet. This paper discuss the use of the free frequency of 915 MHz for monitoring and supervision af this polymeric insulators, and can thus provide data about the web, as well, indicate its useful live. Was performed a data transmission with variations of the intensity of eletric fields resulting from the line fitting of the 500kv rated voltage insulator. The variation of the electric field was obtained using different anti-corona rings. Its values were obtained using software as Gmsh and GetDP which use the method of finites elements. Was possible to observe that the central frequency of the carrier didi not change when a sign passed throw the electric field, besides being possible to perform the communication between the sensors having, at the most critical configuration, a packet loss equal to 1,6%. Also was possible observerd that for all tests performed occurred a small degradation of the sign during the data transmission. / Em um sistema de transmiss?o de energia el?trica, os isoladores est?o diretamente associados ao n?vel de seguran?a da rede, na qual sua falha influ?ncia em indicadores das concession?rias. Os isoladores polim?ricos est?o adquirindo com o passar dos anos maior utiliza??o, sendo que possui in?meras vantagens perante seus concorrentes (vidro e/ou porcelana), entretanto sua vida ?til ainda n?o pode ser determinada. Este trabalho aborda a utiliza??o da frequ?ncia livre de 915 MHz para monitoramento e supervis?o destes isoladores polim?ricos, sendo poss?vel assim fornecer dados sobre a rede bem como indicando a sua vida ?til. Foi realizado uma transmiss?o de dados mediante varia??es da intensidade do campo el?trico decorrentes do terminal fase do isolador da classe de tens?o de 500 kv. A varia??o da intensidade do campo el?trico foi obtido utilizando an?is anti-corona diferentes, sendo seus valores obtidos atrav?s de simula??es utilizando os softwares Gmsh e GetDP que utiliza o m?todo dos elementos finitos. Foi poss?vel observar que a frequ?ncia central da portadora n?o teve varia??o quando o sinal passava pelo campo el?trico, al?m de ser poss?vel realizar a comunica??o entre os n?s sensores tendo, na configura??o mais cr?tica, uma perda de pacotes igual a 1,6%. Tamb?m foi poss?vel observar que para todos os ensaios realizados ocorreu pequena degrada??o do sinal durante a transmiss?o de dados.

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