Disturbance identification method used during intrusion of lightning waves in transformer substation

The invention relates to a novel disturbance identification method used during intrusion of lightning waves in a transformer substation, which comprises the following steps of: (1) monitoring a voltage signal of a busbar in real time; (2) performing S transformation on the voltage signal in failure, and establishing a module time-frequency matrix of the voltage signal; and (3) calculating the amplitude of fundamental waves, the times of primary harmonic waves, and the maximum amplitude of the primary harmonic waves by using the module time-frequency matrix, wherein the drop of the amplitude of the fundamental waves of the voltage of the busbar serves as the evidence for judging faulted and non-faulted lighting or other interferences, and the times of the primary harmonic waves and the corresponding amplitudes thereof serve as the evidence for judging whether lighting stroke occurs. Characteristics of a disturbance signal are extracted by using an S transformation technology suitable for analyzing an instable signal; and identification data are established according to the times of the primary harmonic waves of a transient voltage signal and the corresponding amplitudes thereof, aswell as the drop difference of the voltages of the fundamental waves under different disturbance conditions; and moreover, the method has the advantages of simplicity, convenience, high sensibility and accuracy for identification, and is easy for engineering realization.