Smart current transformer system

A system for determining current or power consumption at a primary wire, comprising:

• a current transformer, having a turns ratio and provided with a secondary wire, the current transformer adapted to be installed upon the primary wire in order to step-down a primary current at the primary wire to a secondary current at the secondary wire according to the turns ratio;
• a non-volatile memory connected to the current transformer, wherein the non-volatile memory stores calibration data across a range of load currents, wherein bytes of a calibration block are mapped to specific calibration values;
• and
• a downstream meter in connection with the secondary wire, for measuring at the secondary wire a measured secondary current or a measured power consumption and wherein the current transformer is configured to communicate the calibration data to the meter, in order to calibrate the measured secondary current so as to determine the primary current or to calibrate the measured power consumption so as to determine the power consumption.

A method for determining a primary current or a power consumption at a primary wire, comprising:

• installing at the primary wire, a device comprising:
• a current transformer, having a turns ratio and provided with a secondary wire, the current transformer adapted to step-down the primary current at the primary wire to a secondary current at the secondary wire according to the turns ratio;
• and
• a non-volatile memory connected to the current transformer, wherein the non-volatile memory stores calibration data across a range of load currents, wherein bytes of a calibration block are mapped to specific calibration values;
• connecting a downstream meter with the current transformer via the secondary wire,
• measuring using the meter a measured secondary current or a measured power consumption at the secondary wire, and
• at the meter:
• receiving the calibration data, and
• calibrating, using the calibration data, the measured secondary current so as to determine the primary current or calibrating the measured power consumption so as to determine the power consumption.