Method for generating circuit-breaking signals

Details Method for generating circuit-breaking signals Method for generating circuit-breaking signals

1986-05-20

1988-10-25

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, 361 87, H02H 308, H02H 344

Patent

active

047807890

ABSTRACT:
A method for generating a circuit-breaking signal in dependence upon the magnitude and duration of an excess current, where a measured quantity, derived from the excess current, is sampled, is converted into digital values, and these values are weighted in accordance with a predetermined function and are added in order to obtain a circuit-breaking signal when the sum exceeds a predetermined comparison value. In order to improve upon a method of this kind in such a manner that, in the case of a diminishing excess current, a false interruption of the circuit is safely prevented, an auxiliary quantity (.DELTA.i) is formed which corresponds to the difference quotient or differential quotient of the measured quantity (M) and when the absolute amount of the auxiliary quantity (.DELTA.i) is already below a predetermined limit value and the sampled value of the excess current is below a predetermined threshold (S), the addition is interrupted.

REFERENCES:
patent: 3654516 (1972-04-01), Traversi
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patent: 3983377 (1976-09-01), Vitins
patent: 4208692 (1980-06-01), Rohr
patent: 4219858 (1980-08-01), De Puy et al.
patent: 4219860 (1980-08-01), De Puy
patent: 4432031 (1984-02-01), Premerlani
patent: 4589073 (1986-05-01), Kidd
patent: 4605982 (1986-08-01), Harner et al.
patent: 4642724 (1987-02-01), Ruta

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