Restraint signal interface circuit

Details Restraint signal interface circuit Restraint signal interface circuit

1985-03-06

1987-11-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 361 68, H02H 304

Patent

active

047061553

ABSTRACT:
An electrical distribution system having a plurality of dissimilar protective circuit breakers spaced upstream and downstream along the stream of the system includes a restraint signal interface circuit producing upstream restraint signals to the upstream breakers in response to received downstream restraint signals indicating the state of the downstream circuit breakers. The interface circuit pairs the downstream and upstream restraint signals to have the same electrical parameters and information, ground fault and short-time, content, while different pairs have different parameters and information content. A selection or logic circuit internal of the interface circuit distributes an active information state to all upstream restraint signals carrrying the same information as any one downstream restraint signal in an active information state.

REFERENCES:
patent: 4112476 (1978-09-01), Benninger
patent: 4322768 (1982-03-01), Maeda et al.
patent: 4468714 (1984-08-01), Russell
patent: 4470093 (1984-09-01), Yamaura
patent: 4551718 (1985-11-01), Cookson et al.

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