Protective relay system for a power system
Patent 4517619 Issued on May 14, 1985. Estimated Expiration Date: 
December 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.InventorApplicationNo. 06/445846 filed on 12/01/1982US Classes:361/64, With communication between feeder disconnect points361/66With communication between feeder disconnect pointsExaminersPrimary: Moose, Harry E. Jr.Attorney, Agent or FirmInternational ClassesH02H 1/00 (20060101)H02H 7/26 (20060101) Foreign Application Priority Data1981-12-02 JPAbstractA protective relay system for power system is disclosed which receives electrical information from several points of a power transmission line via optical fiber transmission line to protect the system from a line fault. Instruction is sent to the respective points when a line fault phenomenon is detected from the information received for separating it from the power system. The system has high immunity from electrical noise in the process of information transmission to obtain improved response.Other References
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