Switching device for the short-circuit and overload protection o

Details Switching device for the short-circuit and overload protection o Switching device for the short-circuit and overload protection o

1981-12-17

1983-06-28

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 94, H02H 308

Patent

active

043909205

ABSTRACT:
Switching device for the short-circuit and overload protection of a power switching circuit, including an input, an output, a first AND gate, a power amplifier, a current limiter circuit and a current sensor connected in series between the input and output, the first AND gate having an inverting input, a threshold value switch connected to the current sensor for producing a current sensor-shaped signal to be fed to the inverting input of the first AND gate, a digital switch-in retarder for delaying the arrival of the current sensor-shaped signal at the inverting input of the first AND gate by producing a given switch-in time lag for blocking the first AND gate until a given switch-off time lag has run out in case of short-circuits and overloads, the digital switch-in retarder including a second AND gate having a first input, a second input, a third inverting input and an output, and a first counter being after-connected to the second AND gate and having a pulse timing input, a resetting input and an output, the first input of the second AND gate being connected to the threshold value switch, an oscillator connected to the second input of the second AND gate, the third inverting input of the second AND gate being connected to the output of the first counter, the output of the second AND gate being connected to the pulse timing input of the first counter, the output of the first counter being connected to the inverting input of the first AND gate, and a second counter for producing the given switch-off time lag, the second counter having an input connected to the oscillator and an output connected to the resetting input of the first counter.

REFERENCES:
patent: 3899718 (1975-08-01), Schafe
patent: 3979645 (1976-09-01), Wittenzellner

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