Avaliação da proteção de distância em linhas de transmissão de circuito duplo com estudo de caso
Nenhuma Miniatura disponível
Data
2020-10-30
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
Approximately 20% of the transmission lines of the Brazilian national interconnected
system are double circuit, being the most used configuration type after single circuit
transmission lines. For this reason, the importance of studying double circuit transmission
lines is highlighted. When two transmission lines are close, such as a double circuit
transmission line, a mutual zero sequence coupling is observed between them. This mutual
zero sequence coupling interferes in the impedance calculated by the distance protection,
in the case of short circuits involving the ground, due to the zero sequence current in the
healthy parallel line and the presence of zero sequence mutual impedance. Considering the
distance protection applied to double circuit transmission lines, this dissertation presents a
comparative assessment between traditional and compensated distance protections, which
considers the influence of the operating condition of the parallel circuit on the protected
line. In addition, the distance protections are assessed using phase comparators, such that
in the results the impedance units operation is analyzed. For this purpose, a 138 kV real
transmission system is modeled in the Alternative Transient Program (ATP) software and
subjected to single phase-to-ground fault, varying the fault resistance value, the system
loading, the power of the sources, the fault line and the fault location in each line. From the
results obtained, it is verified that the correction of the mutual zero sequence coupling can
improve or worsen the performance of the distance protection in relation to the function
21 traditional, which depends on power of the sources and the fault location. Thus, it is
emphasized that for the cases analysed the correction of the mutual zero sequence coupling
does not significantly improved the performance of the distance protection.
Descrição
Citação
SILVA, J. C. M. Avaliação da proteção de distância em linhas de transmissão de circuito duplo com estudo de caso. 2020. 84 f. Dissertação (Mestrado em Engenharia Elétrica e da Computação) - Universidade Federal de Goiás, Goiânia, 2020.