Recovery protection device for a thyristor valve

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

H - Electricity

02

M

321/91

H02M 7/155 (2006.01) H02M 1/18 (1980.01) H02P 13/24 (1980.01)

Patent

CA 1175103

- 1 - ABSTRACT OF THE DISCLOSURE 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 protec- tion device comprises a voltage-sensing member which indi- cates 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.

381558

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