Schneider Electric Sa

Jean-Marc Kasbarian

Simon Tian

Christine Clausse

Pascal Hanchin

During a first test phase, the device, after detecting the presence of a load, enables the nature of the load to be identified. For this, a control circuit connects the load to an AC main power system, while limiting the current in the load. The device measures several tens of samples of instantaneous values of the load voltage and current during a limited number of half-waves of an AC sine signal and determines the load impedance and the current/voltage phase shift. These characteristics, possibly with complementary parameters derived from the voltage and current measurements, enable the nature of the load to be identified. During a second test phase, the control circuit applies pulses limited in voltage to the load and detects possible short-circuit, differential or overload faults.

Device for preventive detection of faults with identification of the

The device comprises an electronic switch able to temporarily connect a load to an AC power supply system so as to apply the power system voltage to the load during a test phase corresponding to a half-wave of the power system voltage. A control circuit of the electronic switch measures the output current and voltage of the device and calculates the load impedance. It compares the variation of the load impedance during the test phase to curves representative of different types of load. The device performs preventive overload detection by estimating the rated power of the load according to the type of load detected.

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Marseille, France

Jean-Marc Kasbarian