Static overcurrent relay

Details Static overcurrent relay Static overcurrent relay

H - Electricity

02

H

348/26

H02H 3/08 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1059608

ABSTRACT OF THE DISCLOSURE A solid state protective device is disclosed which monitors an electric quantity such as current in a pro- tected 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 signal is supplied, to approximate the non-linear operating characteristics of earlier electro- mechanical protective devices.

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