Static overcurrent relays

Details Static overcurrent relays Static overcurrent relays

1974-09-10

1976-07-06

Miller, J D

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

317 33R, 307294, H02H 308

Patent

active

039684105

ABSTRACT:
A solid state protective device is disclosed which monitors an electric quantity such as current or its negative phase sequence component in a protected circuit and which responds to abnormal increases in the value of that quantity by activating a circuit breaker or warning device after a period of time which is a non-linear inverse function of the magnitude of the circuit quantity being monitored. The device includes a non-linear function generator, using novel arrangements of operational amplifiers, to approximate the non-linear operating characteristics which are desired and in one form includes an automatic range changing feature to increase the operating range of the device.

REFERENCES:
patent: 3252007 (1966-05-01), Saari
patent: 3531689 (1970-09-01), Horn
patent: 3550020 (1970-12-01), Gill et al.
patent: 3628160 (1971-12-01), Pickering
patent: 3697813 (1972-10-01), Fox
patent: 3849706 (1974-11-01), Johnson et al.

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