Device for measuring electric current intensity

A device for measuring an electric current, comprising:

• a sensor (3) positioned in an airgap of a core (N) of a transformer (B) and sensitive to a direction of a magnetic field prevailing in the airgap,
• the transformer, in use, having a first electric current (i1) of a first magnetic field of a first direction generated by a primary winding (1) of the transformer,
• the transformer, in use, having the first electric current balanced by a second magnetic field of second direction opposite the first direction and generated by a secondary winding (2) of the transformer in which a second compensating current (i2) flows,
• the magnetic field in the airgap being a field resulting from an addition of the first and second magnetic fields,
• the sensor (3) configured to regulate said compensating current (i2) in closed loop mode by the sensor (3) sensing only a direction of said resultant magnetic field and controlling a reversal of a direction of circulation of the compensating current (i2) in said secondary winding (2), the sensor being sensitive only to the direction of said resultant magnetic field,
• a measurement resistor (Rm) placed in series with the secondary winding (2) to obtain a value of the first current (i1) through a measurement of the second compensating current (i2), and
• a temperature correction element (10) for the circuit of said secondary winding (2),
• the temperature correction element being connected in series with the measurement resistor.