Research and Application of Online Monitoring System for DC Magnet Bias of Main Transformer in Guanyinyan Hydropower Station
This paper proposes a main transformer DC magnet bias monitoring system based on neutral point current,transformer temperature information,and noise signals.The neutral point current of the main transformer is collected using a flexible optical current transformer,which solves the problems of low accuracy,easy interference,and insulation difference in traditional Hall element measurement of neutral point current.The system comprehensively utilizes various detection signals such as neutral point current,temperature,and noise.It can detect abnormal situations of DC magnet bias in the main transformer and facilitate users to collect a large amount of first-hand information,laying a foundation for in-depth research on DC magnet bias suppression in the main transformer.In addition,this scheme has good applicability and can be pro-moted to substations and power plants with similar risks.
DC magnet bias detectionHall elementflexible optical current transformer
万方数据
维普
