Switch cabinet partial discharge positioning method based on transient earth voltage and ultrasonic waves

The invention relates to a switch cabinet partial discharge positioning method based on transient ground voltage and ultrasonic waves, and the method comprises the following steps: S1, determining the measurement position of a switch cabinet, carrying out the transient ground voltage and ultrasonic wave combined measurement of the measurement position of the switch cabinet, and obtaining the actual transient ground voltage and ultrasonic waves; s2, calculating the energy ratio N of the transient ground voltage and the ultrasonic wave of each detection position of the actual switch cabinet; s3, selecting the maximum transient ground voltage to ultrasonic energy ratio Nmax from the ratios in the S2; and S4, comparing the maximum energy ratio Nmax with the energy ratio N * of the same position obtained by simulation, if the comparison error does not exceed an error threshold value, taking the maximum energy ratio Nmax as the position of the partial discharge source in the switch cabinet, otherwise, changing the