Gate controlling apparatus for a thyristor valve

Details Gate controlling apparatus for a thyristor valve Gate controlling apparatus for a thyristor valve

H - Electricity

02

M

323/10

H02M 1/08 (2006.01) H02M 1/088 (2006.01)

Patent

CA 1120102

Abstract of the Disclosure A thyristor valve includes a plurality of thyristors connected in series and series circuits each including a capacitor and a resistor and connected in parallel with each thyristor. A pulse from a pulse generator for firing the thyristors is applied to them at the beginning of a prescribed period of conduction of the thyristor valve when voltage across a selected one of the thyristors is forward. An output signal of a current detector provides a firing pulse to all thyristors when the valve current exceeds a predetermined current value during the prescribed period of conduction of the thyristor valve. In this way an overvoltage can be prevented from being applied to a specified one of the thyristors due to variations in the holding currents of the respective thyristors. The arrangement is simpler in construction than prior art arrangements.

307093

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