Damage positioning method for ultrasonic detection of transmission line

Abstract

The invention discloses a damage positioning method for the ultrasonic detection of a transmission line. The time delay of an ultrasonic guided wave signal between a driving point and a damage point is calculated by acquiring a time domain signal of the ultrasonic guided wave detection signal and adopting the technology of wavelet transform to obtain the damage position in the transmission line. The damage positioning method has the advantages of strong generality and accurate positioning, and can be suitable for various ultrasonic guided wave-based detection devices.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a damage location method for ultrasonic testing of transmission lines. Background technique [0002] In industrial fields such as power transmission and transformation, various material types of transmission lines used in large quantities are affected by acid-base corrosion environments, etc., and are prone to damage such as peeling, cracks or even breakage, resulting in equipment failure. High-voltage transmission lines pass through the field and urban residential areas, are exposed to the atmosphere all year round, and are often affected by various meteorological conditions such as wind, ice, and temperature. Under rain, snow or freezing conditions, the icing of suspended transmission lines and fixed towers of high-voltage transmission lines will cause huge disaster consequences. Ice and snow on transmission lines often cause line tripping, disconnec...

AI Technical Summary

Problems solved by technology

At the beginning of 2008, southern my country encountered rare ice and snow disasters. The continuous freezing rain made many power transmission wires and towers covered with ice thickness of 50-100mm, which greatly exceeded the technical standard for bearing ice thickness of general power transmission networks, resulting in The electricity tower collapsed, and the power transmission network was paralyzed in a large area, which caused a series of problems such as traffic jams, electricity and coal shortages, poor communication, power outages and water supply, and destruction of trees.

[0006] According to foreign data, there are many methods for transmission line detection technology, such as image detection method, infrared detection method, eddy current detection method, robot detection method, elastic wave method, etc., but most of them are immature and are in the initial stage

For the monitoring of icing and other damages on long-distance transmission lines, traditional methods cannot meet the requirements due to the limitations of their maximum detection distance, detection accuracy and engineering applicability.

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