Non-linear alternating current transducer

Details Non-linear alternating current transducer Non-linear alternating current transducer

H - Electricity

01

F

348/20, 336/3, 3

H01F 38/28 (2006.01) G01R 15/00 (2006.01) G01R 15/18 (2006.01)

Patent

CA 1194202

ABSTRACT The non-linear alternating current transducer in- cludes a current transformer core (14, 50 or 80) compris- ing a yoke (14, 50 or 80) for receiving a line conductor (20 or 110) and a secondary winding (22 or 86). The yoke (14, 50 or 80) has an air gap (19, 56 or 101-105) config- ured to provide a non-linear magnetic circuit response for changes in current through the line conductor (20 or 110). The non-linear magnetic circuit response provides a loga- rithmic voltage output across the secondary winding (22 or 86). The current transformer (12) is used in a control cir- cuit (10) for sensing, monitoring and interrupting current in the line conductor (20 or 110) such that a trip coil is energized to open the circuit whenever current is sensed above a predetermined current. Also, the logarithmic re- sponse provides for high gain at low currents and low gain at high currents so that a very uniform percentage-of- reading accuracy is obtained with a meter operating off of the secondary winding.

424587

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