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Blowout coil

 
Sci-Tech Dictionary: blowout coil
(′blō′au̇t ′köil)

(electromagnetism) A coil that produces a magnetic field in an electrical switching device for the purpose of lengthening and extinguishing an electric arc formed as the contacts of the switching device part to interrupt the current.


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Sci-Tech Encyclopedia: Blowout coil
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A coil that produces a magnetic field in an electrical switching device for the purpose of lengthening and extinguishing an electric arc formed as the contacts of the switching device part to interrupt the current. The magnetic field produced by the coil is approximately perpendicular to the arc. The interaction between the arc and current and the magnetic field produces a force driving the arc in the direction perpendicular to both the magnetic flux and the arc current (see illustration).

Relation of directions of current, magnetic flux, and movement of arc in a blowout coil.
Relation of directions of current, magnetic flux, and movement of arc in a blowout coil.


 
 

 

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Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved.  Read more