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http://dx.doi.org/10.5762/KAIS.2020.21.3.129

Development of Current Limiting COS Fuse Link with Improved Overcurrent and Protection Coordination performance  

Kim, Youn-Hyun (Division of Electrical Engineering, Hanbat University)
Kim, Young-Ju (Reformtech Corporation)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.3, 2020 , pp. 129-136 More about this Journal
Abstract
A Cut Out Switch (COS) is used for line protection and pole transformer protection in power systems. The COS used to protect the pole transformer is installed on the power side of the pole transformer to protect the electric equipment from fault currents. The COS is composed largely of a body and a fuse holder, and when the fault current is energized, the element of the fuse link in the fuse holder is melted to block the fault current. The arc generated when the COS fuse link is blown causes fire and noise, causing discomfort to residents in the surrounding area, and the arc flame can cause secondary damage to the peripheral device. In this study, a current-limiting COS fuse with improved overcurrent blocking performance rather than explosion type was developed to solve the arc and noise problems during COS operation. The overcurrent breaking performance of the current-limiting COS improves the reliability by developing a striker and COS fuse bracket. In addition, this study aimed to verify the performance of the developed current-limiting COS fuse through a test at an authorized institution.
Keywords
Cut Out Switch; Fuse Link; Current-Limiting Fuse; Striker; Overcurrent Breaking;
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