A Method for Ultrasonic Location of Partial Discharge Fault Points in Traction Transformers

Abstract

The invention discloses an ultrasonic positioning method for a partial discharge fault point of a traction transformer. Obtain ultrasonic signals and denoise through four ultrasonic sensors placed on the surface of the transformer; then analyze the collected ultrasonic waveforms to obtain waveform characteristic parameters, including peak-rise time ratio, kurtosis, peak frequency and spectral centroid; then obtain ultrasonic signals The judgment coefficient of the path can identify the propagation path of the ultrasonic signal; finally, the coordinates of the partial discharge source are obtained by establishing and solving the time difference equation. This method effectively improves the positioning accuracy and efficiency of transformer partial discharge discharge.

Description

Technical field[0001]The present invention belongs to the introduction of the traction power supply equipment online monitoring technology, and specifically, the present invention relates to a method of traction transformer local discharge failure point ultrasound positioning.Background technique[0002]Traction transformers are critical equipment in the traction power supply system, and its safe operation is significant. A large amount of information indicates that the main reason for the failure of the traction transformer is the deterioration of its insulation performance. Local discharge is the main reason for the insulation of transformer and is also one of the main signs, which is important for online detection and precise positioning. The ultrasonic signal is generated when the transformer is partially discharged, so detection and positioning the transformer partial discharge by detecting the ultrasonic signal.[0003]Due to the complex structure of the traction transformer, it i...

AI Technical Summary

Problems solved by technology

[0003] Due to the complex structure of the traction transformer, it is difficult for conventional methods to distinguish the propagation path of the ultrasonic signal as a direct path or an indirect path

The current partial discharge ultrasonic positioning method often ignores the influence of the transformer structure on the propagation path, and simplifies the ultrasonic propagation path to a straight line to the ultrasonic sensor, resulting in a large partial discharge positioning error

Images