Fast Fault Detection and Active Isolation of Bidirectional Z-Source Circuit Breaker with Mechanical Switch

Hyeon-Seung Lee, Young-Maan Cho, Kun-A Lee () and Jae-Ho Rhee ()
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Hyeon-Seung Lee: School of Social Safety System Engineering, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea
Young-Maan Cho: Reliability Assessment Center, Hyundai Electric & Energy System Co., Ltd., 17-10 Mabuk-ro, 240 bean-gil, Giheung-gu, Yongin-si 16891, Gyeonggi-do, Republic of Korea
Kun-A Lee: School of Social Safety System Engineering, Research Center for Safety and Health, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea
Jae-Ho Rhee: Department of Electrical Engineering, Bucheon University, 25 Sinheung-ro, 56beon-gil, Bucheon-si 14632, Gyeonggi-do, Republic of Korea

Energies, 2022, vol. 15, issue 23, 1-14

Abstract: In this paper, a new design is provided so that the Z-source circuit breaker with a mechanical switch operates quickly at a low-impedance fault. When the fault occurs, the Z-source circuit breaker uses an impedance network to generate forced current zero crossing on the switch. This current zero-crossing time is not sufficient when mechanical switches are applied. In addition, since the MS switch operates through the fault detection sensor, the speed is slowed down. At a slower speed, the circuit breaker may not allow fault current isolation. To solve this problem, the Thomson coil was added to the circuit. It operates immediately in a low-impedance fault without additional fault detection devices. As a result, the faster operating speed is expected to reduce the size of the Z-source circuit breaker component and the stress of the breaker. It is mathematically analyzed and derived, and verified through simulations and experiments. The main features of the proposed model are fast detection and operation, normal-state circuit disconnect, fault current limitation, and low conduction loss.

Keywords: mechanical switch (MS); low-impedance fault; fast detection and isolation; Thomson coil (TC); Z-source circuit breaker (ZCB); Z-source circuit breaker with mechanical switch (MS-ZCB) (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: 2022
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