Metodologia para avaliação da suportabilidade de disjuntores frente às solicitações de TRT

• Ano de defesa: 2025
• Autor(a) principal: Lazzari, Eleonora Fripp
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; UFSM; Programa de Pós-Graduação em Engenharia Elétrica; Centro de Tecnologia
• Palavras-chave em Português: Sistemas de potência; Transitórios de altas frequências; Tensão de restabelecimento transitória; Suportabilidade de disjuntores; Inferência Fuzzy; Power systems; Very fast transients; Transient recovery voltage; Supportability of circuit breakers; Fuzzy inference; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: http://repositorio.ufsm.br/handle/1/36772

The occurrence of transients in power systems has attracted growing attention in the technical literature due to its relevance to the operational reliability of electrical equipment under high-frequency stresses, such as those arising from circuit breaker operations. These events may generate overvoltages capable of compromising the integrity of components, especially during fault clearing, when the Transient Recovery Voltage (TRV) across the contacts can reach critical levels. To address this issue, this work proposes a methodology based on Fuzzy Logic with a Sugeno-type structure, employing fixed membership functions and consequents adjusted through a weighted average according to the activation degree of the rules. The proposed approach acts as a technical screening tool that enables a preliminary assessment of circuit breaker susceptibility to TRV stresses without the immediate need for extensive numerical simulations. The model allows classification of circuit breakers according to their susceptibility to TRV based on electrical parameters extracted from the system, even under operating conditions not previously simulated. Validation is performed through cross-analysis with control of sample origin, ensuring robustness and representativeness. Samples classified as critical are subsequently evaluated through electromagnetic transient simulations, in which TRV envelopes defined by international standards are verified in terms of both amplitude and rate of rise. The results demonstrate the applicability and effectiveness of the proposed methodology as a screening tool, capable of identifying conditions that require detailed evaluation and significantly reducing the computational burden of traditional simulation approaches, thereby contributing to the preventive assessment of circuit breaker reliability in power systems.