Importance

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Abstract

A plurality of relatively high magnetic permeability strips are interleaved to form layers of a closed loop differential transformer core. Although the material of each layer by itself may have a relatively square hysteresis loop, the core formed of a plurality of interleaved layers of such material has a substantially more rounded hysteresis loop. Such a core can advantageously be used in a ground fault interruption circuit in which power leads pass through a central opening in the core to form a primary winding and a secondary winding wound on the core may have a capacitor connected in circuit therewith to complete a resonant circuit. By virtue of its more rounded hysteresis loop, the core, in cooperation with the capacitor, permits the establishment of a resonant current in the secondary circuit which is sufficient to trip a circuit breaker after a few cycles of operation of the alternating current or pulsed unidirectional primary current when a small differential current exists between the power leads as a result of a ground fault.

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First Claim