Method for estimating time difference of homologous partial discharge ultrasonic signals
By using a time difference estimation method for ultrasonic signals of partial discharge from the same source, and employing adaptive filters and cross-correlators, the problem of equipment sampling rate limitation is solved, achieving high-precision time difference estimation and noise resistance, which is suitable for partial discharge location of power equipment.
CN116859190BActive Publication Date: 2026-07-24XI AN JIAOTONG UNIV
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Patent Information
- Application Number
- CN202310732732.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-20
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2043-06-20
AI Technical Summary
Technical Problem
The resolution of existing extraction of time difference of ultrasonic signals from the same source partial discharge is limited by the sampling rate of the equipment, resulting in low positioning accuracy and high cost.
Method used
A time difference estimation method for two-channel homogeneous ultrasound signals is adopted. By using first and second transverse adaptive filters and cross-correlators, super-resolution time difference estimation is achieved through iterative updating of the adaptive filter weight coefficients and peak extraction of the cross-correlators.
Benefits of technology
It improves the accuracy and noise resistance of time difference estimation, reduces positioning errors, is suitable for miniaturized equipment, and lowers economic costs.
✦ Generated by Eureka AI based on patent content.
Abstract
A time difference estimation method of homologous local discharge ultrasonic signals, wherein two-channel homologous ultrasonic signals are collected; the order of a transverse adaptive filter and the number of a cross-correlator are set; the two-channel homologous signals are input into two transverse adaptive filters; the weight coefficients obtained by the two transverse adaptive filters are input into a k-stage cross-correlator; and the time difference between the homologous ultrasonic signals is obtained by peak extraction on the output of the cross-correlator. The method has the advantages of high time resolution, small time difference estimation deviation and good noise resistance, and has high application value in the field of local discharge positioning in power equipment (such as power transformers).
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