Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1983-03-17
1985-07-30
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 77, 361 84, 307127, H02H 326
Patent
active
045325693
ABSTRACT:
A power distribution apparatus, and related method, for coupling single-phase power from a three-wire input line to a power outlet only when the ac power signals carried on the input line have the correct polarity. Particular wires of the three-wire input line are designated to carry a positive power signal, a neutral power signal, and a negative power signal, with the positive and negative power signals having opposite polarities. The apparatus detects the voltage difference between the power signals carried on the two wires designated to carry the positive and negative power signals and couples power to the power outlet only when the detected voltage difference exceeds a prescribed threshold. Since the detected voltage difference exceeds the threshold only when the polarities of the power signals on the input line are correct, the system prevents the coupling of incorrect voltage levels to the power outlet and thus eliminates electrical shock hazards of this kind.
REFERENCES:
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patent: 2628999 (1953-02-01), Bruyne
patent: 2922925 (1960-01-01), Gerrard
patent: 3551749 (1970-12-01), Hore
patent: 3944891 (1976-03-01), McDonald et al.
patent: 4163270 (1979-07-01), Marus
patent: 4196378 (1980-04-01), Shirai
ABCO Hardware and Builders Supply, Inc.
Eisenzopf Reinhard J.
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