Selectable integrating characteristic timer for protective relay

Details Selectable integrating characteristic timer for protective relay Selectable integrating characteristic timer for protective relay

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

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