A method for imaging the interior of insulators based on terahertz scanning technology

Abstract

The invention discloses an insulator internal imaging method based on terahertz scanning technology, which relates to the field of power systems. First, the imaging algorithm proposed by the invention uses an acquisition model based on Radon transform, and uses Radon transform and Fourier slice theorem to reconstruct the image. Then, in order to improve the reconstruction clarity, the experimental data is expanded by the interpolation algorithm, and then the Radon transform is used for imaging to make the imaging result clearer. Through the above steps, the present invention achieves the goal of detecting important indicators such as the internal mechanical structure of the insulator (such as micro-cracks, etc.), and scanning with a scanning array in the future can further improve the accuracy and efficiency and achieve comprehensive detection.

Description

technical field [0001] The invention relates to the field, in particular to an insulator internal imaging method based on terahertz scanning technology. Background technique [0002] The new infrastructure UHV transmission projects continue to expand, and a large number of UHV transmission and transformation projects will start construction in the next five years. The use of large-tonnage porcelain insulators has exceeded 10 million pieces, and the demand is very strong. [0003] UHV power grids have extremely high reliability requirements for large-tonnage porcelain insulators. The technical conditions of UHV porcelain insulators require that within 3 years after being put into operation, the average annual deterioration rate should not be greater than 5 / 100,000, and the service life should not be less than 40 years. . However, large-tonnage porcelain insulators are affected by many factors such as the product's own technical level, manufacturing process, transportation a...

AI Technical Summary

Problems solved by technology

However, large-tonnage porcelain insulators are affected by various factors such as the product's own technical level, manufacturing process, transportation and installation, and the environment. Newly put into operation and grid-connected large-tonnage porcelain insulators with a value of 420KN and above have increasingly frequent zero-value problems, and the deterioration rate has increased year after year. , the situation is very serious

[0004] Facing the problem of rising UHV zero-value rate, in recent years, power grid companies have focused on strengthening the inspection of UHV large-tonnage porcelain insulators, and carried out a series of research and application of zero-value detection methods, such as unmanned aerial vehicle charged infrared detection, blackout tower Manual zero measurement and other means have achieved certain results, but on the one hand, there are many disadvantages such as high misjudgment rate due to environmental factors, high safety risks in tower operations, and on the other hand, it has not yet fundamentally stepped out of the UHV engineering applications faced by power grid enterprises. The Dilemma of Too High Deterioration Probability of Large Tonnage Porcelain Insulators

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