Desempenho da função de sobrecorrente aplicada à proteção de linhas de transmissão: avaliação de falha de seletividade
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Data
2021-01-18
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Editor
Universidade Federal de Goiás
Resumo
The protection of Electrical Power Systems has relays
as main components. When there is a defect or disturbance in
the system, the relays must be sensitized and, in a coordinated
action, they act by isolating the defect by disconnecting the smallest
possible portion of the system. This paper aims to analyze the
performance of the phase overcurrent and neutral function (ANSI
51 / 51N), in order to check possible situations of improper
performance, especially regarding the loss of selectivity. For this
purpose, several simulations of fault conditions were applied in a
system consisting of two parallel transmission lines, disregarding
the magnetic coupling, at a voltage of 230 kV, based on a real
system. All modeling was performed in the ATP environment.
The following faults were simulated: single-phase, two-phase, twophase-ground, and three-phase. The faults were applied along the
entire length of the transmission lines, at intervals of 10% of their
length, maintaining a healthy circuit and a defective one. Faults
with 0.1 Ω and 40 Ω fault resistance were considered. The results
were analyzed according to the TRIP signals of each relay after
the fault was applied. It was found that the overcurrent function is insufficient for satisfactory protection of the analyzed system,
with regard to the selectivity of defect elimination, considering that
situations were observed in which there would be the opening of
at least one of the sides of the healthy line. On the other hand,
it was observed that the neutral overcurrent function contributes
to increase the sensitivity of the protection system, facilitating the
adjustment of the phase overcurrent protection, complementing it.
Descrição
Palavras-chave
Electric power systems, Protection of transmission lines, Overcurrent protection, Relay 51
Citação
LABRE, João Victor Moraes; PAULA, Matheus Vicente. Desempenho da função de sobrecorrente aplicada à proteção de linhas de transmissão: avaliação de falha de seletividade. 2021. 17 f. Trabalho de Conclusão de Curso (Graduação) - Escola de Engenharia Elétrica, Mecânica e de Computação, Universidade Federal de Goiás, Goiânia, 2021.