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Open AccessArticle

Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

School of Electronic & Electrical Engineering, Yonam Institute of Technology, Jinju-si, Gyeongsangnam-do 52821, Korea
Energies 2019, 12(9), 1725; https://doi.org/10.3390/en12091725
Received: 4 April 2019 / Revised: 19 April 2019 / Accepted: 3 May 2019 / Published: 7 May 2019
(This article belongs to the Special Issue Electric Power Systems Research 2019)
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Abstract

Loop power distribution systems are gaining increasing attention due to improvements in the reliability of the power supply and the connection of distributed generation. With loop distribution systems, there is the possibility of mal-operation of the protection relay because of the existence of the tie switch and bi-directional current injection. In this paper, we propose a novel protection scheme considering the tie switch operation in the open loop power distribution system using wavelet transform. We analyze the possibility of mal-operation of the protection relay as a result of the normal load current after tie switch operation and analyze the characteristics of the normal load current and fault current injection after tie switch operation. Using these results, a new index is proposed to distinguish the normal load current and fault current, and a novel protection scheme based on this new index is proposed. The proposed method is modeled using an electromagnetic transients program and MATLAB, and the various simulations are performed according to the tie switch position, the fault location, and the success or failure of the fault section separation. From the simulation results, we can confirm that the normal load current and the fault current after tie switch operation can be accurately distinguished and the protection relay can accurately operate at only fault conditions. View Full-Text
Keywords: open loop distribution system; protection scheme; Wavelet Transform; tie switch open loop distribution system; protection scheme; Wavelet Transform; tie switch
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Seo, H.-C. Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform. Energies 2019, 12, 1725.

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