Proteção de distância em linhas de transmissão longas e extra longas

• Ano de defesa: 2015
• Autor(a) principal: Marcos Roberto de Araújo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Proteção de distância não convencional; Pouco mais de meia onda; Acoplamento mútuo de sequência zero; Compensação em derivação no meio da linha; Grafos; Engenharia elétrica; Linhas de telecomunicação
• Link de acesso: http://hdl.handle.net/1843/BUBD-A4KF7T

In scenarios of power generation bases far from load centers, such as the Brazilian, the construction of extra long transmission lines is necessary to meet the growing demand for electricity. In the last decade, the use of the alternating current transmission line little longer than half wavelength has been widely discussed by researchers, however, little has been addressed about the performance of its protection schemes. This work presents an evaluation of the effectiveness of the unconventional distance protection when applied to those lines. First, the application of the unconventional distance protection to a long line under non-compensation and under in-line shunt compensation conditions was validated. Then, it was evaluated the application of the unconventional distance protection to an extra long line by varying the pre-fault loading, the fault resistance and the source impedance ratio. Furthermore, it was analyzed the sensitivity of such protection in relation to the influence of the zero sequence mutual coupling between parallel transmission lines little longer than half wavelength. Considering the robustness required for systems of so high power carrying capacity, the results show that there are still challenges to be overcome for a safe application of the unconventional distance protection to transmission lines little longer than half wavelength.