THYRISTOR CURRENT FAILURE MONITORING DEVICE OF HIGH-VOLTAGE DIRECT CURRENT CAPABLE OF IDENTIFYING AN ABNORMAL OPERATION STATE WITH THE NAKED EYE

摘要

PURPOSE: A HVDC[High-voltage direct current] thyristor current failure monitoring device is provided to identify the abnormal operation state of a valve with the naked eye by exposing the abnormal state to the outside by using a latch circuit in case of a current failure.;CONSTITUTION: A re-ignition control card interface(510) interfaces a monitoring unit(540) for monitoring a valve and a control card. A detection unit(530) latches by detecting changes in the control card output in order to detect a valve which generates a re-ignition control signal. At this time, if the output of the control card changes, the detection unit is able to latch a re-ignition control signal according the change to the corresponding RS flip-flop. The monitoring unit monitors the operation state of each valve in real time by using the RS flip-flop output signal of the detection unit and performs a function providing a state contact point to an event recorder successively. A display unit(550) displays the operation state of the monitoring unit of each valve to the outside by using the RS flip-flop output signal of the detection unit.;COPYRIGHT KIPO 2013;[Reference numerals] (510) Control card interface; (520) Power supply device; (530) Detection unit; (540) Monitoring unit; (550) LED display unit;