NDLI: Effect of eddy currents on the current interruption performance of axial magnetic field type of vacuum interrupters

Content Provider	IEEE Xplore Digital Library
Author	Bhat, R. Kulkarni, S.V. Kulkarni, S. Hemachander, M.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. Eng., IIT Bombay, Mumbai, India (Bhat, R.; Kulkarni, S.V.) \|\| Global R&D Centre, Crompton Greaves Ltd. (CG), Mumbai, India (Kulkarni, S.; Hemachander, M.)
Abstract	In the axial magnetic field (AMF) type of vacuum interrupters (VI), the design of their contact system is such that the magnetic field is oriented parallel to the arc. AMF keeps the arc diffused, and the value of the current-up to which the arc stays diffused depends on the contact diameter and the magnitude of the axial field. A certain minimum AMF is required to keep the arc diffused. AMF also induces eddy currents in the contact discs. This paper analyses the effect of eddy currents induced in the discs on AMF between the contacts, especially near the current zero region. This analysis incorporates the opening motion of the contacts along with the variation of the coil currentwith time. Initially, a 2-D axis symmetric model of the AMF contact is simulated to determine the radial variation ofthe magnetic field along a plane mid-way between the two separating contacts. A 3-D model of the AMF contact is then analyzed to include the effect of radial slots in the contact plate. The change in the magnetic field profile with the number of slots is studied.
Sponsorship	Plansee
Starting Page	305
Ending Page	308
File Size	951892
Page Count	4
File Format	PDF
ISBN	9781479967506
e-ISBN	9781479967520
DOI	10.1109/DEIV.2014.6961680
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-28
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic fields Eddy currents Coils Solid modeling Interrupters Geometry Three-dimensional displays
Content Type	Text
Resource Type	Article

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