Empirical wavelet transform-based traction network line pilot protection scheme and device

The invention discloses a traction network line pilot protection scheme and device based on empirical wavelet transform. The protection scheme comprises the steps of starting protection when it is determined that a traction network line meets action conditions; acquiring fault current signals of four acquisition points M, N, a and b under the condition of meeting the starting protection; performing empirical wavelet transform on the fault current signals of the acquisition points to obtain high-frequency energy of M, a, N and b points; and determining internal and external faults according to the high-frequency energy ratio of the points M and a and the high-frequency energy ratio of the points N and b. The invention provides a traction network line pilot protection scheme based on empirical wavelets according to the magnitude relation of high-frequency transient energy on two sides of a boundary by utilizing the attenuation effect of a traction network line boundary of a through-type in-phase traction direct