Investigation on the Interruption Process of Molded Case Circuit Breakers Including the Influence of Blow Open Force

Xingwen LI  Degui CHEN  Qian WANG  Ruicheng DAI  Honggang XIANG  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1187-1193
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1187
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Contactors & Circuit Breakers
blow open force,  interruption process,  circuit breaker,  electro-dynamic repulsion force,  

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To one double-breaker model, experimental investigation on blow open force was carried out. It demonstrates that the ratio between the emerging blow open force and arc power FB/ui decreases with the arcing time, the contact gap has less effect on FB/ui, and the characteristics of the blow open force are similar when the peak value of the short circuit current is beyond 4 kA. Then, according to the experimental data and conclusions, considering the influence of blow open force, the interruption process of molded case circuit breakers (MCCBs) was investigated. It demonstrates the blow open force has significant influence on interruption process and the proposed method is effective to evaluate new design of MCCBs.