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Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system

A technology of composite insulators and ultrasonic guided waves, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, and measuring devices. The effect of reducing the risk of missed inspection, high defect detection rate and low cost

Inactive Publication Date: 2016-03-23
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this technology has been widely used in the non-destructive testing of pipelines and steel rods, but there are few studies on the application of composite insulators.

Method used

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  • Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system
  • Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system
  • Ultrasonic guided-wave detecting system for defect of composite insulator and detecting method of ultrasonic guided-wave detecting system

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Embodiment

[0039] Such as figure 1Shown is a simplified double-layer rod model for theoretical analysis of composite insulators, where the coordinate axis z is the centerline of the cylinder, and R1 and R2 represent the radius at the interface and the outer radius of the outer layer, respectively. The experimental specimens in this example use the insulators produced by Guangzhou Microlean Electric Power Co., Ltd., the models are FXBW4-35 / 70, FXBW4-35 / 100 and FXBW4-110 / 100-A, obtained by measuring the data of the experimental specimens Relevant parameters, among which the technical parameters of the model FXBW4-110 / 100-A composite insulator are the length 1.06m (the length of the insulator is the length after cutting off the fittings at both ends), the radius of the glass core rod is 9mm, and the density is 2176.17kg / m 3 , Poisson's ratio 0.3, elastic modulus 57Gpa, outer silicone rubber coating thickness 4mm, density 1241.7kg / m 3 , Poisson's ratio 0.25, and elastic modulus 0.1245Gpa; u...

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Abstract

The invention discloses an ultrasonic guided-wave detecting system for the defect of a composite insulator. The ultrasonic guided-wave detecting system comprises a system master control computer, a signal generator, a power amplifier, a piezoelectric paster and a digital oscilloscope. The invention further discloses a detecting method applied to the ultrasonic guided-wave detecting system for the defect of the composite insulator. The detecting method comprises the following steps that 1, the frequency dispersion equation of propagation of guided waves in a composite insulator model is determined; 2, a corresponding frequency dispersion curve is obtained through insulator test piece related parameters tested through experiments; 3, stimulation guided wave frequency, periods and modal are determined according to a frequency dispersion curve conclusion; 4, stimulation and receiving points are selected, and defect detection of guided waves is achieved; 5, a guided wave detecting waveform is placed in a computer for data analysis processing, whether the defect exits or not it judged, and the size and type of the defect are judged. The detecting advantages of being accurate, fast, long in distance, large in range, low in cost and the like are achieved.

Description

technical field [0001] The invention relates to a power equipment detection technology, in particular to an ultrasonic guided wave detection system and a detection method for composite insulator defects. Background technique [0002] Composite insulators have been widely used in high-voltage transmission projects due to their advantages in light weight, good anti-fouling performance, easy maintenance, and low cost. However, due to the manufacturing process and the increase in operating life, some hidden defects will appear inside the composite insulator, such as debonding of the sheath and mandrel, breakage of the mandrel, etc., which pose a great threat to the safe operation of the power grid, resulting in The hazards will be very serious. Therefore, it is very important to realize the rapid and accurate detection of internal defects of composite insulators to ensure the safe operation of the power grid. [0003] At present, many scholars at home and abroad have developed...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/041G01N29/043
Inventor 邓红雷鲁强陈力
Owner SOUTH CHINA UNIV OF TECH
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