Sistema de detecção de faltas em linhas de transmissão de alta tensão: uma abordagem a partir da teoria das ondas viajantes e da transformada de Wavelet

• Ano de defesa: 2020
• Autor(a) principal: LUCAS, Fernando Ferreira
• Orientador(a): SOUZA, Everton Granemann
• Banca de defesa: YAMIN, Adenauer Corrêa, BECKER, Carla Diniz Lopes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Catolica de Pelotas
• Programa de Pós-Graduação: Mestrado em Engenharia Eletronica e Computacao
• Departamento: Centro de Ciencias Sociais e Tecnologicas
• País: Brasil
• Palavras-chave em Português: Sistemas de potência; localização de faltas; ATPDraw; transformador de potencial capacitivo; transformadas de Wavelet; ondas viajantes
• Palavras-chave em Inglês: coupling capacitor voltage transformer; ATPDraw; Transmission lines; traveling waves; fault location; Wavelet transform
• Área do conhecimento CNPq: MEDIDAS ELETRICAS, MAGNETICAS E ELETRONICAS; INSTRUMENTACAO::SISTEMAS ELETRONICOS DE MEDIDA E DE CONTROLE
• Link de acesso: http://tede.ucpel.edu.br:8080/jspui/handle/jspui/889

Transients in power systems are caused by short circuits between phases, phase-to-ground, lightning strikes, switching operations, that can cause overvoltages, overcurrents, and harmonic distortions. To minimize these effects, a reliable protection study and precise details of the elements that make up the electrical power system is needed. Seeking to contribute to these studies, the present work presents a hybrid algorithm for fault location based on traveling waves theory and continuous Wavelet transform. In order to detect the fault point, the signal described in the time domain was decomposed in the scale-translation space through the continuous Wavelet transform (CWT), to detect the instant of occurrence of a fault as well as its reflection waves. For the tests, the electric circuit and signals were simulated with the software ATPDraw and the fault detection algorithm was implemented in Matlab language. The parameters used in the circuit simulation were obtained from real data from a 128 km transmission line, coupled to a potential capacitive transformer, which links the cities of Candiota and Pelotas, both located in the state of Rio Grande do Sul. During the tests, phase-to-ground faults were simulated, with variations in the distance from the fault point to the protection relay and the fault incidence angle, both highlighted in the literature as main sources of error in modeling with traveling waves.