Partial discharge type identification method and device based on non-contact ultrasonic sensor

Abstract

The invention provides a partial discharge type identification method and device based on a non-contact ultrasonic sensor. The method comprises the following steps: collecting a signal through a non-contact ultrasonic sensor, filtering the collected signal through a high-pass filter to remove low-frequency noise interference, and obtaining waveform data to be processed; performing partial discharge pulse signal capturing and partial discharge pulse signal peak value labeling on the waveform data to be processed; estimating the partial discharge intensity of the captured and marked partial discharge pulse signal; drawing an intensity-time scatter diagram of the partial discharge pulse signal according to the estimated partial discharge intensity; gridding the scatter diagram, and taking the position coordinates of each grid of the scatter diagram and the probability of points in each grid as scatter diagram characteristic values; and according to the scatter diagram feature value, identifying the partial discharge type by using a data classifier.

Description

technical field [0001] The invention relates to the field of power equipment detection, in particular to a partial discharge type identification and intensity evaluation method based on a non-contact ultrasonic sensor. Background technique [0002] In the power system, the phenomenon of partial discharge of equipment (referred to as partial discharge) is an important indicator to reflect the operation status of power equipment. Non-contact ultrasonic sensors are currently one of the main means for partial discharge detection. However, since the non-contact ultrasonic sensor has been unable to effectively identify the type and intensity of partial discharge, the effect in practical application is not good. It can only do qualitative detection, and cannot give the type information and intensity estimation of partial discharge. It is easy to This results in missed diagnosis and misjudgment of partial discharge failures. SUMMARY OF THE INVENTION [0003] In order to overcome...

AI Technical Summary

Problems solved by technology

However, since the non-contact ultrasonic sensor has been unable to effectively identify the type and intensity of partial discharge, the effect it can achieve in practical applications is not good. It can only do qualitative detection, and cannot give the type information and intensity estimation of partial discharge. Missed and misjudged partial discharge faults

Images