Overvoltage protection device for thyristor valve

Details Overvoltage protection device for thyristor valve Overvoltage protection device for thyristor valve

H - Electricity

02

H

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H02H 7/125 (2006.01) H03K 17/08 (2006.01) H03K 17/082 (2006.01)

Patent

CA 1327835

Abstract of the Disclosure A thyristor valve protected from an overvoltage by means of an arrester, comprising a voltage detector for detecting a forward voltage applied to the thyristor valve and generating an output signal when the detected voltage exceeds a predetermined voltage which is set lower than the protection level of the arrester, and a circuit for inhibiting a gate pulse from being applied to the thyristor valve in response to the output signal from the voltage detector. The inhibition circuit permits the gate pulse to be applied to the thyristor only when the condition of the presence of conduction command signal PHS and forward voltage signal FV, and the absence of output signal Vp* of the voltage detector, is satisfied.

561560

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