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Energies 2017, 10(10), 1584; doi:10.3390/en10101584

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

1
Department of Electrical and Computer Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
2
Department of Heavy Industry, ILJIN Electric Inc., 905-17, Mannyeon-ro, Hwaseong-si, Gyeonggi-do 18365, Korea
*
Author to whom correspondence should be addressed.
Received: 30 August 2017 / Revised: 29 September 2017 / Accepted: 6 October 2017 / Published: 12 October 2017
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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. View Full-Text
Keywords: electric field strength simulation; pre-arcing time calculation; short-circuit current making performance; streamer discharge theory electric field strength simulation; pre-arcing time calculation; short-circuit current making performance; streamer discharge theory
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kang, M.-C.; Kim, K.-H.; Yoon, Y.T. Pre-Arcing Time Prediction in a Making Test for a 420 kV 63 kA High-Speed Earthing Switch. Energies 2017, 10, 1584.

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