A METHOD FOR COMMUNICATION BETWEEN A LOW POTENTIAL LEVEL AND A VALVE LOCATED ON HIGH VOLTAGE POTENTIAL IN A HIGH VOLTAGE CONVERTER STATION AS WELL AS A DEVICE FOR SUCH A COMMUNICATION

摘要

A device for communication between low potential level and a valve of a high voltage converter station located on high voltage potential level comprises means (20) adapted to send serial messages on light conductors between a valve control unit (1) and a control unit (3) for controlling semiconductor components (4) of the valve of turn-off type on high voltage potential level in periods of time when the respective light conductor is free from signals associated with a change of the conducting state of the semiconductor component, such as turn-on and/or indication signals.