Fault diagnosis method and system for converter transformer on-load tap changer

By processing the vibration signal of the on-load tap changer of the converter transformer using a stochastic resonance model and the Cuckoo optimization algorithm, converting it into a three-dimensional Hilbert spectrum and calculating the distortion rate, the problem of insufficient diagnostic accuracy and physical interpretability in the existing technology is solved, and efficient fault identification and differentiation are achieved.

CN122430680APending Publication Date: 2026-07-21STATE GRID ANHUI ULTRA HIGH VOLTAGE CO +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID ANHUI ULTRA HIGH VOLTAGE CO
Filing Date
2026-04-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies lack sufficient physical interpretability and diagnostic accuracy in the fault diagnosis of on-load tap changers in converter transformers, making it difficult to effectively distinguish between similar faults.

Method used

The vibration signal is denoised using a stochastic resonance model and converted into a three-dimensional Hilbert spectrum. The Gaussian curvature and normal vector are calculated, and fault diagnosis is performed using the distortion rate. The stochastic resonance model parameters are optimized using the Cuckoo optimization algorithm.

Benefits of technology

It improves the accuracy and physical interpretability of fault diagnosis, enables more precise identification of fault types in on-load tap changers, and enhances adaptability to non-stationary transient signals and noise interference resistance.

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Abstract

The application discloses a kind of converter transformer on-load tap-changer fault diagnosis method and system, including using random resonance model to the vibration signal to be measured generated when on-load tap-changer operation is carried out denoising processing, obtain the signal after denoising;The signal after denoising is converted into three-dimensional hilbert energy spectrum, and the Gaussian curvature and normal vector of three-dimensional hilbert energy spectrum are calculated;Based on Gaussian curvature and normal vector, the surface volume corresponding to the vibration signal to be measured is calculated;The distortion rate between the surface volume corresponding to the vibration signal to be measured and the surface volume of the normal vibration signal measured when converter transformer on-load tap-changer is in normal state is calculated;Based on distortion rate, on-load tap-changer is diagnosed.
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Citation Information

Patent Citations

  • Mechanical fault diagnosis method for on-load tap-changer of transformer

    CN113553930A

  • Mechanical fault diagnosis method based on minimum entropy deconvolution and stochastic resonance

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