Abstract: A method and a system for controlling the switching time of a device that includes a magnetic circuit and a conductive winding. The method includes acquiring a measurement of the magnetic field generated by the residual flux, by a sensor placed near the magnetic circuit; processing the acquired measurements to infer the residual flux in the magnetic circuit; determining, on the basis of the residual flux, the optimal time for switching on the device. The method also includes switching on a three-phase transformer. The transformer includes a primary conductive winding and a secondary conductive winding surrounded by an enclosure. A magnetic field sensor is on the magnetic circuit and/or on one outer surface of the enclosure.

Abstract: The invention relates to a method and a system for controlling the switching time of a device that includes a magnetic circuit and a conductive winding. Said method includes the steps of: acquiring a measurement of the magnetic field generated by the residual flux, by means of a sensor placed near the magnetic circuit; processing the acquired measurements so as to infer therefrom the residual flux in the magnetic circuit; determining, on the basis of the residual flux, the optimal time for switching on the device. All of said steps are carried out after the device has been switched off. The invention also relates to the use of said method to switch on a three-phase transformer. The invention relates to a transformer comprising a primary conductive winding and a secondary conductive winding surrounded by an enclosure and, on the magnetic circuit and/or on one outer surface of the enclosure, a magnetic field sensor belonging to said system.