Safety method and device for full-voltage power supply to a user

Details Safety method and device for full-voltage power supply to a user Safety method and device for full-voltage power supply to a user

1998-05-22

2000-08-08

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 86, 307326, 307116, 307 64, 361171, H02J 904, H02J 300

Patent

active

061006076

ABSTRACT:
A method of detecting a condition requiring connection of a user apparatus with a feeder line comprises the steps of low-voltage power supplying the user apparatus through a detection impedance (17, 17a); detecting the waveform at the ends of the detection impedance; operating connection of the user apparatus with the feeder line when the waveform at the ends of the detection impedance is distorted in a manner that has been pre-established to be caused by actuation of a command in the user apparatus and requiring full powering of same. A device in accordance with the method comprises an analysis circuit (19, 37) detecting (by comparison with sample waveforms stored in a memory (20), for example) distortion of the waveform at the ends of the impedance (17, 17a) and consequently operating powering of the user apparatus.

REFERENCES:
patent: 5029037 (1991-07-01), Bartelink
patent: 5151841 (1992-09-01), Knights
patent: 5642004 (1997-06-01), Bircher

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