Title :
Design improvements to a three-material passive magnetic current limiter
Author :
Calman, Silvain ; Dawson, Francis P. ; Yamada, Sotoshi ; Iwahara, Masayoshi
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
7/1/2001 12:00:00 AM
Abstract :
This paper shows that flux nonuniformity in a passive magnetic fault current limiter softens the transition characteristics from the saturated to the unsaturated state. Soft transition characteristics lead to higher core losses and a derating in the maximum nominal operating current. Flux uniformity is improved by using a combination of extended magnets and an anisotropic saturable core. The use of distributed permanent magnets or an extended magnet leads to larger differential inductance ratios
Keywords :
fault current limiters; magnetic flux; permanent magnets; anisotropic saturable core; differential inductance ratio; distributed permanent magnet; extended magnet; magnetic flux nonuniformity; soft transition; three-material passive magnetic fault current limiter; Anisotropic magnetoresistance; Core loss; Fault current limiters; Inductance; Magnetic anisotropy; Magnetic cores; Magnetic flux; Permanent magnets; Perpendicular magnetic anisotropy; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
