Static overcurrent relay

Details Static overcurrent relay Static overcurrent relay

1974-09-10

1976-03-16

Miller, J. D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

317 33R, 317141S, 328142, 307229, H02H 308

Patent

active

039448908

ABSTRACT:
A solid state protective device is disclosed which monitors an electric quantity such as current in a protected circuit and which responds to abnormal conditions by activating a circuit breaker or warning device after a period of time which is related by a non-linear inverse function to the magnitude of the circuit quantity being monitored. The device includes a non-linear function generator, using an operational amplifier to which a relatively low bias signal is supplied, to approximate the non-linear operating characteristics of earlier electromechanical protective devices.

REFERENCES:
patent: 3248569 (1966-04-01), Weekes
patent: 3252007 (1966-05-01), Saari
patent: 3339114 (1967-08-01), Kelley et al.
patent: 3436559 (1969-04-01), Wajs
patent: 3496417 (1970-02-01), Tenenbaum
patent: 3508140 (1970-04-01), Moses
patent: 3531689 (1970-09-01), Horn
patent: 3550020 (1970-12-01), Gill et al.
patent: 3697813 (1972-10-01), Fox
patent: 3757234 (1973-09-01), Ohlson
patent: 3807816 (1974-04-01), Hamburg
patent: 3849706 (1974-11-01), Johnson et al.
"Electronic Trip Control For A Low Voltage, High Current Breaker," David Little, 1968 - Thesis submitted to Faculty of The Moore School of E.E.

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