A method for monitoring and extracting characteristic signals of aeolian vibration of power transmission line in extremely cold region

By using OPGW optical fiber as a sensor in power transmission lines in extremely cold regions, combined with distributed optical sensing technology and adaptive filtering, the problems of cost, reliability, and communication stability in monitoring micro-wind vibration in extremely cold environments have been solved. This has enabled real-time monitoring of micro-wind vibration and fatigue damage assessment of the entire line, improving the safety and operation and maintenance efficiency of the power transmission lines.

CN122282084APending Publication Date: 2026-06-26CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
Filing Date
2026-04-02
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies for monitoring micro-wind vibration of transmission lines in extremely cold regions suffer from contradictions between cost and coverage, power supply reliability issues, poor environmental adaptability, and insufficient communication stability, making it difficult to achieve full-line, three-dimensional micro-wind vibration monitoring and cumulative fatigue damage assessment.

Method used

By using the spare optical fiber in the OPGW of the transmission line as a sensor and combining it with distributed optical sensing technology, the micro-wind vibration is monitored in real time through optical time-domain reflectometry. The signal is processed by adaptive filtering and wavelet threshold denoising. Combined with Miner's linear cumulative fatigue damage theory and extreme cold environment correction, feature signal extraction and fatigue damage assessment are achieved.

Benefits of technology

It enables continuous, real-time monitoring of micro-wind vibrations along the entire line, improving signal recognition accuracy and evaluation results, reducing maintenance costs, and enhancing the reliability of the line and the scientific nature of vibration prevention measures.

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Abstract

This invention provides a method for monitoring and extracting characteristic signals of aerodynamic vibrations in transmission lines in extremely cold regions. The invention utilizes spare optical fibers in the OPGW (Optical Power Wire) of the transmission line, injecting probe light pulses into the fibers and collecting backscattered Rayleigh light signals to obtain raw optical time-domain reflectometry data. The signals are filtered to eliminate noise introduced by the extremely cold environment. Vibration time-domain signals at various points along the line are extracted and converted into frequency-domain signals. A characteristic frequency search interval is set to identify the characteristic frequencies of the Karman vortex, forming a Karman vortex spectrum feature set. Aerodynamic vibration events are identified based on the feature set, and their intensity is graded. Combining the conductor S-N curve corrected for extremely cold temperatures, the cumulative fatigue damage value of each span along the line is calculated using Miner's linear cumulative fatigue damage theory. A distribution map of aerodynamic vibration states along the line is output, and early warnings are issued for high-risk sections. This invention achieves online monitoring of aerodynamic vibrations across the entire transmission line, exhibiting strong environmental adaptability, accurate feature extraction, and reliable evaluation results.
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