Method for generating a tripping signal as a function of the mag

Details Method for generating a tripping signal as a function of the mag Method for generating a tripping signal as a function of the mag

1986-06-13

1988-08-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 364483, H02H 300

Patent

active

047617063

ABSTRACT:
A method for generating a tripping signal as a function of an overcurrent. Sampled measurement values are converted into digital values which are weighted and added up according to a predetermined function. If the sum value is above a predetermined reference value, the tripping signal is formed. In order to cancel the addition before the tripping signal is formed in dependence on the wave shape of the overcurrent if the overcurrent is decaying, the digital values of the respective last period of time corresponding to at least a half-period of the overcurrent are stored and a comparison of all digital values simultaneously stored with each other is made. The determined largest stored value is weighted and added up as a digital value and the addition is cancelled if a largest digital value is below the predetermined threshold.

REFERENCES:
patent: 4017766 (1977-04-01), Vercellotti et al.
patent: 4219860 (1980-08-01), Depuy
patent: 4291355 (1981-09-01), Dinger

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