DC Leakage Current Sensors

A direct current leakage current sensor is used to measure the milli-ampere level DC current in a primary conductor with both AC (alternating current) 
and DC (direct current) components. The sensor uses the “magnetic modulation” technique to offset the AC component in the primary conductor by introducing an offsetting magnetic field. The offsetting magnetic field is generated by an interior square wave oscillator which balances the primary conductor AC current magnetic field.