Analysis and Mitigation on Switching Transients of Medium-Voltage Low-Harmonic Filter Banks

Joon-Ho Kim and Jin-O Kim
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Joon-Ho Kim: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Jin-O Kim: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea

Energies, 2020, vol. 13, issue 9, 1-14

Abstract: This paper presents the switching transients of medium-voltage low-harmonic filter banks, which have alower back-to-back inrush current and higher transient recovery voltage (TRV) compared with capacitor banks. The switching transients of the filter banks are described by the analytical approach and field measurements for 150 MVA back-to-back filter banks are provided to support the switching phenomena described in this paper. As a mitigation measure of the high transient recovery voltage, a double-breaker type switchgear is analyzed in terms of the operating sequence and the time of the upper and lower breakers. From the analyses, an operation scheme for the double-breaker switchgear is proposed to avoid insulation failure of the breaker during the interruption by mitigating the transient recovery voltage across each breaker.

Keywords: back-to-back inrush current; capacitor switching; harmonic filter banks; switching transients; transient recovery voltage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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