Selectable integrating characteristic timer

Details Selectable integrating characteristic timer Selectable integrating characteristic timer

1985-12-27

1987-12-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361 85, H02H 3093

Patent

active

047108436

ABSTRACT:
A characteristic timer, for a protective relay which provides protection for a portion of an AC transmission line, exhibits a phase characteristic which is always integrating and a ground characteristic which changes from non-integrating to integrating as a function of input signal pulse width and a preselected cut off time. The ground characteristic begins to integrate upon expiration of the preselected cut off time or if the input signal pulse width exceeds a predetermined check level of magnitude during the cut off time. If the pulse width magnitude of the input pulse is less than or equal to the predetermined check level magnitude during the cut off time, the characteristic will be non-integrating.

REFERENCES:
patent: 4012669 (1977-03-01), Gelfand et al.
patent: 4180842 (1979-12-01), Keeny
patent: 4316230 (1982-02-01), Hansen et al.
patent: 4405966 (1983-09-01), Cavero
patent: 4420789 (1983-12-01), Breen
patent: 4438476 (1984-03-01), Breen
patent: 4486803 (1984-12-01), Zylstra

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