Patent ID: 7423854
Filing Date: 2008-09-09
Classification: H01B,H02H

Abstract:
1. An interrupter circuit for interrupting power from a power source, comprising a power cable comprising an insulated line wire and an insulated neutral wire; a disconnect switch interposed between the power source and said power cable; a disconnect switch driver for controlling said disconnect switch; a sensing circuit comprising a differential transformer including a transformer core having a core opening; a first primary winding comprising said insulated line wire and said insulated neutral wire extending through said core opening; a secondary winding wound about said transformer core connected to said disconnect switch driver for opening said disconnect switch upon said secondary winding detecting an imbalance in the magnetic flux in said transformer core; a voltage divider circuit connected across one of said power source and said power cable for providing a voltage node; and a second primary winding wound about said transformer core interconnecting said second portion of said drain wire and said voltage node for creating an imbalance in the magnetic flux in said transformer core upon sensing a leakage current between said conductive shield and one of said insulated line wire and said insulated neutral wire for opening said disconnect switch for disconnecting said power cable from the power source.