AN ARRANGEMENT AND A METHOD FOR MONITORING THE STATUS OF DC-SIDE REACTORS IN AN HVDC TRANSMISSION

摘要

An arrangement for monitoring the status of two smoothing reactors (7, 8) in a back-to-back-station having line-commutated thyristor converters (4, 5) and a DC-link (6) interconnecting the converters and provided with smoothing reactors (7, 8) and a grounded mid point (9), comprises means (10, 11) configured to measure the voltages across the two reactors and means (12-15) configured to filter out at least one of the dominating harmonic voltage components resulting from the commutations of said converters on the DC-side thereof from voltage values delivered by said first means for use thereof for determining the status of the smoothing reactors.