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Refinement of Recloser Operation and Safety Enhancement in Distribution Systems: A Study Based on Real Data

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  • Geonho Kim

    (Smart Power Distribution Laboratory, Korea Electric Power Corporation Research Institute, Daejeon 34056, Republic of Korea)

  • Tae-Hwan Kim

    (Smart Power Distribution Laboratory, Korea Electric Power Corporation Research Institute, Daejeon 34056, Republic of Korea)

  • Jun-Hyeok Kim

    (School of Electronic and Electrical Engineering, Hankyong National University, Anseong 17579, Republic of Korea)

Abstract

This study analyzes recloser operation in the South Korean distribution system to propose effective operational strategies for improving safety and efficiency. This research is based on actual data, such as recloser operation data and fault statistics provided by the Ministry of the Interior and Safety and the Korea Electric Power Corporation, without the use of simulation tools or experiments. Key operational elements, such as reclosure counts, sequence settings, and high-current interruption features, were analyzed. First, an analysis of reclosure counts revealed that over 73% of faults were cleared after the first reclosure, and when the second reclosure was included, more than 90% were successfully restored. This finding suggests that reducing the number of reclosures from the standard three to one or two would not significantly impact fault restoration performance while simultaneously reducing arc generation, thereby improving safety. Additionally, a review of recloser sequence settings highlighted the fact that the traditional 2F2D (two fast, two delayed) sequence often led to frequent instantaneous tripping, increasing the risk of arc generation. The 1F1D (one fast, one delayed) sequence, which applies a delayed trip after an initial fast trip, offers a better fault-clearing performance and reduces the risk of arc generation. Lastly, an analysis of the high-current interruption feature suggested that enabling this function for faults with low reclosing success rates, particularly in cases of short-circuit faults, and setting an immediate trip threshold for fault currents exceeding 3 kA would enhance both safety and efficiency. This operational strategy was implemented in the South Korean distribution system over a three-year period, starting in 2021. While there was a 2.1% decrease in reclosure success rates, this strategy demonstrated that similar success levels could be maintained while reducing the number of reclosures, thus mitigating equipment damage risks and improving safety measures. The refined recloser operation plan derived from this study is expected to enhance the overall stability and reliability of distribution systems.

Suggested Citation

  • Geonho Kim & Tae-Hwan Kim & Jun-Hyeok Kim, 2024. "Refinement of Recloser Operation and Safety Enhancement in Distribution Systems: A Study Based on Real Data," Energies, MDPI, vol. 17(22), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:22:p:5700-:d:1520985
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    References listed on IDEAS

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    1. Md Shafiul Alam & Mohammad Ali Yousef Abido & Ibrahim El-Amin, 2018. "Fault Current Limiters in Power Systems: A Comprehensive Review," Energies, MDPI, vol. 11(5), pages 1-24, April.
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