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Previous issue date: 2014-05-26 / Cerca de 10% das faltas envolvendo o sistema el?trico ocorrem em transformadores de pot?ncia. Portanto, a prote??o aplicada aos transformadores de pot?ncia ? essencial para garantir o funcionamento cont?nuo desse dispositivo e a efici?ncia do sistema el?trico. Dentre as fun??es de prote??o aplicadas em transformadores, a prote??o diferencial aparece como um dos principais esquemas, apresentando confi?vel discrimina??o entre faltas internas e faltas externas ou condi??es de carregamento nominal do sistema. Por?m, a principal dificuldade dos m?todos de prote??o convencional consiste na demora para detec??o dos eventos. Contudo, faltas internas, faltas externas e os demais eventos apresentam transit?rios, podendo ser apropriadamente analisados pela transformada wavelet. Neste trabalho ? proposto o desenvolvimento de um esquema de prote??o diferencial de transformadores baseado na transformada wavelet para detec??o e identifica??o de faltas externas, faltas internas e energiza??o do transformador usando a energia dos coeficientes wavelets das correntes diferenciais. Os resultados revelam as vantagens da utiliza??o da transformada wavelet na prote??o diferencial em rela??o ? prote??o convencional, uma vez que ela prov? confiabilidade e rapidez na detec??o desses eventos. / About 10% of faults involving the electrical system occurs in power transformers.
Therefore, the protection applied to the power transformers is essential to ensure the continuous
operation of this device and the efficiency of the electrical system. Among the
protection functions applied to power transformers, the differential protection appears as
one of the main schemes, presenting reliable discrimination between internal faults and
external faults or inrush currents. However, when using the low frequency components
of the differential currents flowing through the transformer, the main difficulty of the
conventional methods of differential protection is the delay for detection of the events.
However, internal faults, external faults and other disturbances related to the transformer
operation present transient and can be appropriately detected by the wavelet transform.
In this paper is proposed the development of a wavelet-based differential protection for
detection and identification of external faults to the transformer, internal faults, and transformer
energizing by using the wavelet coefficient energy of the differential currents. The
obtained results reveal the advantages of using of the wavelet transform in the differential
protection compared to conventional protection, since it provides reliability and speed in
detection of these events.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19278 |
| Date | 26 May 2014 |
| Creators | Medeiros, Rodrigo Prado de |
| Contributors | 03168934470, http://lattes.cnpq.br/7510091283933216, Guimaraes, Alexandre Magnus Fernandes, 65578945449, http://lattes.cnpq.br/4171253034582522, Silva, Kleber Melo e, 03613001403, http://lattes.cnpq.br/8795500242651581, Almeida, Marcos Antonio Dias de, 10611975491, http://lattes.cnpq.br/5323110802158816, Costa, Flavio Bezerra |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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