METHOD FOR DIAGNOSING AN OPERATING STATE OF AN ELECTRICAL SWITCHING DEVICE AND ELECTRICAL SWITCHING DEVICE FOR IMPLEMENTING SUCH A METHOD

A method for diagnosing an operating state of a switching device including separable contacts, which are driven by an electromagnetic actuator including a coil connected to an electronic control device, and sensors that measure a coil voltage and an intensity of a coil current. The method includes:a) receiving an order to open the switching device via the electronic control device;b) controlling the electromagnetic actuator so that it opens;c) measuring and recording the coil voltage and coil current valuesd) calculating and recording values of a magnetic flux through the coil, by integrating the recorded values of the coil current, the coil voltage and resistance and inductance values of the coil; ande) evaluating and recording positions of a core of the electromagnetic actuator according to a data table, which defines a bijective relation between the position of the core, the magnetic flux and the coil current.