Solid state relay

Details Solid state relay Solid state relay

1978-10-06

1981-03-31

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, H02H 3093

Patent

active

042597064

ABSTRACT:
A solid state relay for interrupting current flow in a power distribution circuit is disclosed. The relay includes a long time delay circuit which generates a first trip signal when the magnitude of the peak instantaneous line current rises above a pickup value I1 for a time period which varies as an inverse function of the magnitude of the peak instantaneous time current and which is determined by a first predetermined time current characteristic curve. The first predetermined time current characteristic curve defines the desired operating characteristic of the relay over a first current range extending between the pickup current I1 and the higher current I2. The predetermined time current characteristic curve is determined by a multi-node RC element in the feed back loop of an operational amplifier which forms part of the long time delay circuit.

REFERENCES:
patent: 3018416 (1962-01-01), Karlicek et al.
patent: 3419757 (1968-12-01), Steen
patent: 3558978 (1971-01-01), Nye, Jr.
patent: 3689801 (1972-09-01), Engel et al.
patent: 3701908 (1972-10-01), Neer et al.
patent: 3919600 (1975-11-01), Sons
patent: 4131929 (1978-12-01), Moran
patent: 4158824 (1979-06-01), Wouters et al.

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