Device for preventive detection of faults with identification of

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location

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361 59, G01R 3108, H02H 300

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060811234

ABSTRACT:
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.

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8078 Proceedings of the IEEE, Dec. 1992, No. 12, "Noninstrusive Appliance Load Monitoring," by George W. Hart, pp. 1870-1891.
IBM Technical Disclosure Bulletin, Apr. 1976, vol. 18, No. 11, "Skipping Chopper Cycles in Switching Regulator," by R. Yeager, pp. 3737-3738.

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