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Pre-Arcing Time Prediction in a Making Test for a 420 kV 63 kA High-Speed Earthing Switch

Author

Listed:
  • Min-Cheol Kang

    (Department of Electrical and Computer Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea)

  • Kyong-Hoe Kim

    (Department of Heavy Industry, ILJIN Electric Inc., 905-17, Mannyeon-ro, Hwaseong-si, Gyeonggi-do 18365, Korea)

  • Yong Tae Yoon

    (Department of Electrical and Computer Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea)

Abstract

A high-speed earthing switch (HSES) of a gas-insulated switchgear (GIS) performs a secondary role in protecting the power system in the event of an accident. After being interrupted by a circuit breaker (CB), the short-circuit current remaining in the network should be earthed by the HSES. However, as the contacts of the HSES may have been damaged by a pre-arc during the closing operation, the HSES may fail to ground the short-circuit current. To successfully ground the short-circuit current, the contacts of the HSES must be protected from damage by the pre-arc. Thus, minimizing the pre-arcing time is required to step up the making performance. This paper analyzes the making performance of the HSES by predicting the pre-arcing time within the short-circuit current making test. To estimate the pre-arcing time, we compared the results of analytical calculations based on streamer discharge theory and the numerical simulations of the electric field strength. By conducting a short-circuit current making test for a 420 kV 63 kA HSES in a high-power laboratory, the pre-arcing time calculation results were verified. A comparison of the results showed that the proposed prediction method was useful for verifying the performance of the HSES.

Suggested Citation

  • Min-Cheol Kang & Kyong-Hoe Kim & Yong Tae Yoon, 2017. "Pre-Arcing Time Prediction in a Making Test for a 420 kV 63 kA High-Speed Earthing Switch," Energies, MDPI, vol. 10(10), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1584-:d:114657
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