Online monitoring and diagnosis method and system of station unit

The embodiment of the invention provides an online monitoring and diagnosis method and system of a station unit. The method includes the steps of obtaining operating data of all measuring points of all parts in the station unit, wherein the operating data includes bushing vibration data, load data or temperature data; fitting the operating data of the measuring points and a historical operating curve of the measuring points to obtain predicted operating data of the measuring points; determining early warning information of the measuring points on the basis of the predicted operating data and apreset threshold; and conducting frequency spectrum analysis with early warning information of any part within preset time as the operating data of the measuring point giving an alarm, and determining a failure diagnosis result of the part on the basis of a frequency spectrum analysis result and a preset diagnosis rule. By means of the method and system, the real-time monitoring and failure earlyearning of the station un