Costa, Flávio BezerraFrança, Rafael Lucas da Silva2023-07-142023-07-142023-02-28FRANÇA, Rafael Lucas da Silva. One-terminal traveling wave-based protection for HVAC and HVDC transmission lines. Orientador: Flávio Bezerra Costa. 2023. 103f. Tese (Doutorado em Engenharia Elétrica e de Computação) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2023.https://repositorio.ufrn.br/handle/123456789/53376This work proposes developing one-terminal traveling wave-based transmission line protection methods for HVAC (High Voltage Alternating Current) and HVDC (High Voltage Direct Current) systems. It considers the effect of the sampling frequency on the protection, which until now has not been investigated for one-terminal methods. It addresses inaccuracies in wave velocity estimations, which traditionally lead to problems in methods based on traveling waves, and presents solutions to these problems. The proposed methods have been evaluated through computer simulations. The proposed earth fault distance protection for HVAC transmission lines was evaluated using an actual commercial relay with time-domain-based protection functions. The results related to the proposed earth fault distance protection for HVAC transmission lines show that the proposed function, when associated with other existing protection functions, can achieve a remarkable enhancement in the dependability and velocity of the transmission line protection. The results concerning the method based on traveling wave reflections show that it is possible to protect most point-to-point transmission lines quickly, without communication, and independent of the wave speed estimation. Finally, the results concerning distance protection for meshed HVDC systems demonstrate the applicability of the proposed method for such systems. The method showed an operating time below 2 ms for a line of 500 km in length. This operating time meets the likely requirements that HVDC meshed systems will present. Additionally, the method demonstrated selectivity for a 4-terminal system interconnected by five transmission lines.Acesso AbertoTransmission line protectionTraveling wavesOne-terminal protectionDistance protectionHVAC systemsdoctoralThesisCNPQ::ENGENHARIAS::ENGENHARIA ELETRICA