Device for preventive detection of faults with recognition of th

Details Device for preventive detection of faults with recognition of th Device for preventive detection of faults with recognition of th

1997-08-05

1999-06-08

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 1, H02H 326

Patent

active

059108754

ABSTRACT:
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.

REFERENCES:
patent: 5708551 (1998-01-01), Bosatelli

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