Method for accurately measuring oil filling amount of gearbox of megawatt-grade wind generator set

Provided is a method for accurately measuring the oil filling amount of a gearbox of a megawatt-grade wind generator set. In the method, the oil filling amount is determined at a smaller power loss and a lower lubricating oil temperature, and whether the oil filling amount is reasonable or not, whether a liquid level alarm is given or not during oil filling according to the oil filling amount andwhether the oil temperature, the oil pressure and the bearing temperature are normal or not are determined through an oil filling amount test experiment, an oil filling liquid level calibration experiment, an oil level alarm experiment, a no-load experiment and a loading experiment. By eliminating the influence of the position of a planet gear of the gearbox on the liquid level of lubricating oilin the gearbox, eliminating the influence of the position of an oil pointer of the gearbox and eliminating the amount of remaining oil in a lubricating system and pipelines of the gearbox, a series ofcomplex practical problems