关键词: 水轮发电机组;下导摆度;异常突变;故障处理;滑转子倾斜;南公1水电站;老挝;

Abstract: During the commissioning of an 80MW hydro-generator unit of Namkong-1 Hydropower Station in Laos, there was an abnormal situation which was the sudden increase of the lower guide swing. In order to find out the cause of the change and eliminate the fault, an investigation was carried out from the aspects of dynamic and static friction, mass imbalance, unit axis and bearing sliding rotor. The results showed that the mutation of the lower guide swing of the unit was caused by the tilt of the bearing sliding rotor. Through measures such as dynamic balance test and lowering the position of monitoring probe, the lower guide swing data was significantly improved and the expected purpose was achieved. This article introduced the cause analysis and fault handling of the mutation of the lower guide swing of the hydro-generator, which can be used as a reference for improving the efficiency and accuracy of similar fault diagnoses.

Key words: lower guide swing; abnormal mutation; fault handling; sliding rotor tilt; hydro-generator; Namkong-1 Hydropower Station; Laos