Digital I.sup.2 T pickup, time bands and timing control circuits

Details Digital I.sup.2 T pickup, time bands and timing control circuits Digital I.sup.2 T pickup, time bands and timing control circuits

1984-07-17

1986-05-13

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361 97, 364483, H02H 700

Patent

active

045890528

ABSTRACT:
Digital implementation of the overcurrent determination and time delay before tripping in a static circuit breaker trip unit allows the trip unit circuit to be manufactured in a single chip configuration. The signal after A/D conversion is compared within a magnitude comparator to determine pickup. A pulse stream proportional to the square of the overcurrent signal is developed by multiplying the outputs of two magnitude comparators which compare the A/D level with a continuous binary count. The time delay determination is obtained by means of 3 cascade connected divide by two counters with their outputs connected to a data selector, or by a rate-limiter circuit which uses a fixed frequency to gate a pulse stream proportional to the overcurrent level squared.

REFERENCES:
patent: 4038695 (1977-07-01), DePuy
patent: 4219860 (1980-08-01), DePuy
patent: 4266259 (1981-05-01), Howell
patent: 4347541 (1982-08-01), Chen et al.
patent: 4423459 (1983-12-01), Stich et al.
patent: 4442472 (1984-04-01), Pang et al.
patent: 4476511 (1984-10-01), Saletta et al.

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