G - Physics – 01 – R
Patent
G - Physics
01
R
324/35
G01R 29/16 (2006.01) G01R 31/02 (2006.01) H02H 1/00 (2006.01) H02H 3/08 (2006.01)
Patent
CA 1101065
46,530 APPARATUS FOR SENSING A HIGH PHASE SIGNAL FROM A MULTI-PHASE AC LOAD CIRCUIT ABSTRACT OF THE DISCLOSURE 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 ap- plied 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 re- main 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.
303605
Mcconnell And Fox
Westinghouse Electric Corporation
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