Circuit arrangement for a repetition-blocking device

Details Circuit arrangement for a repetition-blocking device Circuit arrangement for a repetition-blocking device

1976-02-17

1977-08-23

Schaefer, Robert K.

Electrical transmission or interconnection systems

Miscellaneous systems

222 26, 222 32, H02J 400

Patent

active

040442691

ABSTRACT:
The circuit arrangement includes a transformer having a primary side included in at least one phase conductor of a polyphase supply for the load. A control circuit is connected to the secondary side of the transformer and includes a threshold circuit receiving a control signal from the transformer, a memory circuit receiving a threshold signal from the threshold circuit, a bistable switch connected to the threshold circuit and the memory circuit and switched, by the threshold signal, to a position preventing the stored signal from being passed on from said memory circuit, and a controlled electronic switch inserted in the phase conductor and controlled and opened by the stored signal. A resetting switch is operable to reset the control circuit to the initial state, and a delay device may be interposed between the memory circuit and the controlled electronic switch to delay opening of the latter until after a subsequent operation of the repetition-blocking device. The resetting switch controls a further switch, connected between the transformer and the threshold circuit, the memory circuit and the bistable switch.

REFERENCES:
patent: 3033421 (1962-05-01), Henderson
patent: 3498501 (1970-03-01), Robbins et al.
patent: 3913069 (1975-10-01), Rundin et al.
patent: 3951307 (1976-04-01), Muller et al.

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