The invention provides a method for improving wind
turbine generator gearbox failure level judgment precision. The method comprises the steps that A, a
failure type is determined according to the vibration
signal characteristic value of a gearbox bearing; B, the distribution condition of all currently-monitored parameters corresponding to all monitored objects of a wind
turbine generator gearbox in a failure level matrix of the
failure type is determined, the failure level matrix comprises set failure levels, and each failure level comprises the value ranges of the parameters corresponding to the monitored objects of the wind
turbine generator gearbox under the failure level; C, the
occurrence probability of each failure level is calculated according to the distribution condition, and the current failure level is determined according to the
occurrence probability. Therefore,
schematic diagram convergence analysis can be carried out based on different weights of multiple kinds of failure signals, the
blindness of locating the failure through a single failure parameter is avoided, the
false alarm rate is lowered, and the wind turbine generator gearbox failure level judgment precision is improved.