Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1977-06-02
1979-02-13
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
250551, 307311, 323 9, 361 88, H02H 308
Patent
active
041398785
ABSTRACT:
Individual rectified phase voltages are produced and applied to individual opto-isolator units whose output photo diodes are connected in a series string. Each photo diode has a zener diode connected across it with the zener diodes mutually connected in series. A direct voltage applied to the photo diode string is blocked unless one of the photo diodes is made conductive by having received radiation indicative of an overcurrent condition. The responsive photo diode forms a current conduction path with the zener diodes across each of the other photo diodes, which latter may remain nonconductive, for developing at terminals a direct voltage upon occurrence of a predetermined overcurrent, which voltage is useful for application to a trip circuit or the like for interruption of the load circuit in which the overcurrent occurs.
REFERENCES:
patent: 3321631 (1967-05-01), Biard et al.
patent: 3610938 (1971-10-01), Cook et al.
patent: 3811073 (1974-05-01), Shuey et al.
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 3999087 (1976-12-01), Compton
Salce Patrick R.
Telfer G. H.
Westinghouse Electric Corp.
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