Current transformer, circuit interrupter including the same,...

Details Current transformer, circuit interrupter including the same,... Current transformer, circuit interrupter including the same,...

2007-12-11

2007-12-11

Maj, Anh (Department: 2832)

Inductor devices

Wound core

C336S178000, C029S602100

Reexamination Certificate

active

11624721

ABSTRACT:
A current transformer includes a CT core having a central opening, a height, a width, inner and outer radii, and a secondary winding disposed about the CT core. The CT core is formed from a winding of an elongated length of taped steel having a reluctance and a width. The CT core height corresponds to the taped steel width. The CT core width is equal to the difference between the outer and inner radii. An air gap having a reluctance, a width and a depth is disposed in the CT core. The depth is along a portion of the CT core height. The air gap width is substantially smaller than the CT core height and width. The air gap reluctance is substantially greater than the taped steel reluctance. The CT core has a permeability resulting from being annealed at a temperature of 1450 to 1550° F. for one hour.

REFERENCES:
patent: 6144279 (2000-11-01), Collins et al.
patent: 6459349 (2002-10-01), Giday et al.
patent: 6512438 (2003-01-01), Yoshimori et al.
patent: 6992555 (2006-01-01), Hasegawa et al.
patent: 7002440 (2006-02-01), Attarian et al.

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