PROTECTING CIRCUIT OF THYRISTOR VALVE

摘要

PURPOSE:To reliably detect only the malfunction of a forward voltage signal by the defect of a circuit with a simple circuit by locking a forward voltage malfunction detector with a gate block signal outputted when a thyristor converter is stopped. CONSTITUTION:A gate block signal (f) outputted when a thyristor converter is stopped is inputted to a pulse circuit 14, and a pulse signal f1 of the prescribed time is inputted to an AND circuit 15. A breaker signal (c) is also inputted to the circuit 15. An AND circuit 13 locks defect signals FV1, FV2 by the output signal C'.