Study on Arc Behaviors at Opening a 270V Resistive Circuit by Bridge-Type Contacts under Magnetic Field

Xue ZHOU  Xinglei CUI  Guofu ZHAI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.9   pp.1124-1131
Publication Date: 2013/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1124
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices — Papers selected from International Session on Electro-Mechanical Devices 2012 (IS-EMD2012) and other recent research results —)
Category: 
Keyword: 
bridge-type contacts,  dc arcs,  copper contacts,  arc behaviors,  

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Summary: 
Bridge-type contacts are mainly used in high voltage direct current contactors for their performance of arc extinguishment and break capacity. It is also easy to add external magnetic field in them to blow the arc. Experiments on the arc behaviors were carried out when a copper bridge-type contact pair opening a 270V resistive circuit in the air. Influences of the shape of the movable contact, the opening speed and the magnetic flux density on the key behaviors, such as the arc duration, the arc re-ignition and the stability of arcing process, were investigated by using an oscilloscope and a high-speed camera. It was revealed that a uniform magnetic field with proper density could extinguish the arc stably and could reduce the arc re-ignition.