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Damage positioning method for ultrasonic detection of transmission line

A technology of damage location and ultrasonic detection, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, using sound wave/ultrasonic wave/infrasonic wave to analyze materials, and processing detection response signals. Coal tension and other issues

Active Publication Date: 2012-03-07
STATE GRID INTELLIGENCE TECH CO LTD
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  • Description
  • Claims
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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.

Method used

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  • Damage positioning method for ultrasonic detection of transmission line
  • Damage positioning method for ultrasonic detection of transmission line
  • Damage positioning method for ultrasonic detection of transmission line

Examples

Experimental program
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Effect test

Embodiment

[0082] Using two arc-shaped piezoelectric sheets 2 to excite and receive elastic waves respectively, the damage localization of one-dimensional structures, a representative engineering problem, is experimentally studied. The whole experimental system includes a power amplifier, a function signal generator, a computer, an excitation sensor, a receiving sensor, and a quality block.

[0083] A quality block 3 is pasted on the extension lines of the two piezoelectric sheets used as the excitation and the sensor respectively to simulate the icing damage of the transmission line. The excitation piezoelectric sheet has an inner diameter of 22.3 mm, a thickness of 3.2 mm, and a length of 30 mm. The excitation signal is a seven-peak sinusoidal modulation narrowband signal with a peak value of 10V, such as Figure 2a , Figure 2b shown. By analyzing the experimental research results in different frequency ranges, it is found that the propagation mode of 30KHZ elastic wave in the tran...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07G01N29/46G01N29/22
Inventor 杨永军傅孟潮赵金龙裘进浩张华栋
Owner STATE GRID INTELLIGENCE TECH CO LTD
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