Device for protection against short circuits for AC networks and

Details Device for protection against short circuits for AC networks and Device for protection against short circuits for AC networks and

1988-03-03

1989-03-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 93, H02H 308

Patent

active

048149322

ABSTRACT:
A device for protecting an AC distribution network against short circuit currents and an appropriate current limiting circuit breaker. A downstream circuit breaker (D1) generates a signal (S) for neutralizing the opening of the contacts of an upstream current limiting circuit breaker (D2) when the downstream current exceeds a neutralization threshold less than the tripping threshold and/or than the limitation threshold of (D2). The upstream current limiting circuit breaker (D2) has in parallel a pair of head to tail thyristors (TH1, TH2) and a circuit (16) for controlling the gates of the thyristors, this circuit enabling one of the thyristors in response to the signal (S) for inhibiting (D2) for at most one half wave.

REFERENCES:
patent: 3805113 (1974-04-01), Friedrich
patent: 4354215 (1982-10-01), van der Scheer
patent: 4442471 (1984-04-01), Trayer
patent: 4607309 (1986-08-01), Bishop
patent: 4724502 (1988-02-01), Kawahira et al.

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