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Protective Coordination of the OCR with the Voltage Component in a Closed-Loop Power Distribution System with the FCL

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Abstract

Recently, the requirement of the electrical energy from the renewable source has been growing in the South Korea since government’s energy plan to generate the electrical power of 20% as renewable source. In addition, these renewable power plants have been constructed on not only the existing power plant’s side but also customer’s side. These changes in power distribution system cause the fault current to increase higher and to reverse the direction of the fault current. Variable countermeasures to reduce the fault current have been studied and the introduction of the superconducting fault current limiter (SFCL) in the power distribution system, one of them, has been actively reported. However, the installation of the SFCL can affect the power system protection because of the fault current’s decrease or increase, which depends on the construction of the power distribution system. Especially, the application of the SFCL in a closed-loop power distribution system can cause the delayed trip operation or the fast trip operation of the over-current relay (OCR), one of the representative protective devices widely used in a power distribution system. This change can influence on the existed protective coordination. In this paper, the OCR with voltage component, one of the methods to suppress its trip operation’s change in a power distribution system with a closed loop construction due to the application of the SFCL, was suggested and the protection coordination between the OCRs in a power distribution system with a closed loop was analyzed. It was confirmed that a simple using voltage component in the OCR could cause the trip variation of the reverse direction OCR in loop power system and it can be improved by matching the relaying voltage components.

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Acknowledgements

This research was supported by Korea Electric Power Corporation (Grant number: R19XO01-19) and also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MOE) (No. 2020R1F1A1077206).

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Authors and Affiliations

  1. Department of Electrical Engineering, Korea Electrical Safety Corporation, Soongsil University, Seoul, Korea

    Seung-Taek Lim

  2. Department of Electrical Engineering, Soongsil University, Seoul, Korea

    Sung-Hun Lim

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  1. Seung-Taek Lim
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Correspondence to Sung-Hun Lim.

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Lim, ST., Lim, SH. Protective Coordination of the OCR with the Voltage Component in a Closed-Loop Power Distribution System with the FCL. J. Electr. Eng. Technol. 15, 2451–2457 (2020). https://doi.org/10.1007/s42835-020-00522-6

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  • DOI: https://doi.org/10.1007/s42835-020-00522-6

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