Electric motor and transformer load sensing technique

Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits

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361 93, 324 96, 250225, 455606, 455602, 350 9613, 350377, 34087028, H02H 708

Patent

active

044280173

ABSTRACT:
A Faraday rotator optical sensor in combination with optical fiber transmission means is employed to monitor overload current conditions in a high voltage electrical load and transmit this information to a low voltage signal processing circuit while providing desired isolation between the high voltage load and the low voltage signal processing circuit.

REFERENCES:
patent: 3605013 (1971-09-01), Yoshikawa et al.
patent: 3621390 (1971-11-01), Von Willisen
patent: 3662263 (1972-05-01), Bensel
patent: 3675125 (1972-07-01), Jaecklin
patent: 3964020 (1976-06-01), Dickerson
patent: 4075493 (1978-02-01), Wickersheim
patent: 4121122 (1978-10-01), Pokrandt
patent: 4156280 (1979-05-01), Griess

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