Analysis of Characteristics of Low Voltage Circuit Breaker by External Magnetic Field

Young-Maan Cho, Hyun-Jong Park, Jae-Jun Lee () and Kun-A Lee ()
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Young-Maan Cho: Reliability Assessment Center, Hyundai Electric & Energy Systems Co., Ltd., 17-10 Mabuk-ro, 240 bean-gil, Giheung-gu, Yongin-si 16891, Korea
Hyun-Jong Park: Launcher Technology Development Division, Korea Aerospace Research Institute, Daejeon 34133, Korea
Jae-Jun Lee: Department of Electrical Engineering, Yuhan University, 590 Gyeongin-ro, Bucheon-si 14780, Korea
Kun-A Lee: School of Social Safety System Engineering and Research Center for Safety and Health, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Korea

Energies, 2022, vol. 15, issue 21, 1-15

Abstract: Recently, as interest in eco-friendly distributed power has increased, studies on the improvement of the performance of breakers such as DC breakers and on the reliability of existing AC breakers have been actively conducted. To improve the performance and reliability of these breakers, this paper conducted the analysis of characteristics of a low voltage circuit breaker using an external magnetic field. In this experiment, before the current-zero point, the cut-off time to improve the breaker performance is shortened and after the current-zero point, re-ignition, which is associated with reliability, is suppressed. According to the experimental results, the short-circuit characteristics before current-zero show a significant difference of 0.13 ms in the t 21 section, and the dielectric recovery strength after current-zero shows a 13.3% performance improvement in the latter half of the DRV (dielectric recovery voltage) V-t curve. This result has significant meaning because it can be easily improved under the control of the external magnetic field. Hence, it can be applied to the interruption performance improvement of breakers through detailed research in the future.

Keywords: molded case circuit breaker; dielectric recovery strength; external magnetic field; short-circuit characteristics (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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