Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1982-05-17
1984-03-20
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 97, 361 94, H02H 3093
Patent
active
044384769
ABSTRACT:
Disclosed is a characteristic timer for a protective relay which provides protection for a portion of an A.C. transmission line. The characteristic timer has digital logic elements adapted to external circuitry for selecting one or more desired phase angles which determines the activation time of a characteristic timer, which, in turn, determines the operational characteristic of the protective relay. The digital logic of the characteristic timer is further adapted to an external circuitry for selecting an integrating or non-integrating type function for the characteristic timer.
REFERENCES:
patent: 4017766 (1977-04-01), Vercellotti et al.
patent: 4180842 (1975-12-01), Keeney
patent: 4219860 (1980-08-01), De Puy
patent: 4259706 (1981-03-01), Zocholl
Freedman William
General Electric Company
McMahon John P.
Salce Patrick R.
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