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

1988-04-26

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 3093

Patent

active

047408600

ABSTRACT:
A method for generating a tripping signal in dependence on an overcurrent, in which sampled measurement values are converted into digital values. These values are weighted and summed in accordance with a predetermined function. A tripping signal is formed if a predetermined sum value is reached. In order to cause in such a method the delivery of a tripping signal only for true overcurrents, and in order to prevent the delivery of a tripping signal when an overcurrent is decaying and below a threshold, the summation is cancelled while the overcurrent is decaying, immediately in dependence on the waveform of the overcurrent. The digital values of the respective last period of time corresponding to at least one half-period of the overcurrent are stored and a comparison of all the then stored digital values with each other is made. At a determined highest stored value below a predetermined threshold, the summation is cancelled.

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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