Recovery protection device for a thyristor valve

Details Recovery protection device for a thyristor valve Recovery protection device for a thyristor valve

1981-06-29

1983-03-22

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 86, 361 89, 361100, 363 54, 363 57, H02H 7127

Patent

active

043778356

ABSTRACT:
In a thyristor valve having a plurality of series-connected thyristors, each thyristor has an individual recovery protection device arranged in its entirety at the potential of the thyristor. For each thyristor, the protection device comprises a voltage-sensing member whch indicates the point of time when the thyristor takes up reverse blocking voltage. A time-determining member defines a certain time interval, counting from said point of time. Control members are arranged to deliver a control pulse for firing the thyristor if the off-state voltage of the thyristor during the time interval exceeds a predetermined value.

REFERENCES:
patent: 3487261 (1969-12-01), Boksjo et al.
patent: 3865438 (1975-02-01), Boksjo et al.
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4084221 (1978-04-01), Ogata
patent: 4313156 (1982-01-01), Kobayashi et al.

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