Patent ID: 6335673
Filing Date: 2002-01-01
Classification: H01F,Y10T

Abstract:
A current transformer having a closed magnetic circuit, comprising:a plurality of stacked planar metal plates defining the closed magnetic circuit, each plate containing an opening in a center portion thereof for surrounding a primary conductor, each one of the plurality of metal plates being unitary and severed at a single location without removing any material therefrom to define complementary irregularities on each side of the severed area, the metal plates being stacked in the same position with respect to each other such that the severed area of each plate is aligned with the severed area of each of the other plates to enable a portion of said stack of plates to be deflected from the normal position, said complementary irregularities being brought together when said plates are in the normal position to avoid air gaps in the severed areas and to improve transformer response for low current; and a secondary winding having a core that is a part of the magnetic circuit.