A method is provided for testing a wind turbine installation in respect of riding through a voltage dip. As per the method, a voltage dip is simulated and measured data is obtained on the performance of the wind turbine installation based on the simulated voltage dip. The measured data obtained is analyzed regarding variables defined in performance requirements and their permitted values. The measured data is combined to form a measured dataset in a standardized measured data format. The measured dataset is forwarded to an automatic analysis unit which stores evaluation criteria. The analysis unit performs the tasks of deriving values for the variables defined in the performance requirements from the measured data, comparing the values of the variables with the permitted values contained in the performance requirements, performing an evaluation of the comparison according to the stored evaluation criteria and keeping the result of the evaluation ready for output.