Method, device and system for detecting crack of insulator

Abstract

The invention provides a method, a device and a system for detecting a crack of an insulator. The method comprises the steps of acquiring response signals of a porcelain insulator to be detected and a crack-free porcelain insulator in a modal analysis experiment; establishing a finite element model of the porcelain insulator to perform modal analysis to the porcelain insulator according to the physical property of the porcelain insulator; determining the inherent frequencies of the porcelain insulator to be detected and the crack-free porcelain insulator according to the response signals of the porcelain insulator to be detected and the crack-free porcelain insulator and the finite element model respectively; and determining the crack position of the porcelain insulator to be detected according to the relation of the inherent frequencies of the porcelain insulator to be detected and the crack-free porcelain insulator, the inherent frequency of the porcelain insulator, acquired in advance, and the crack position. According to the invention, the finite element model of the cracked porcelain insulator is established to analyze the influence of different crack positions and crack sizes on the inherent frequency of the porcelain insulator, so that the purpose of detecting the crack of the porcelain insulator is achieved, and the safety and the reliability of the porcelain insulator are improved.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to the detection technology of high-voltage power transmission equipment, specifically an insulator crack detection method, device and system. Background technique [0002] High-voltage post porcelain insulators are an important part of transmission lines and substations. They are mainly used for insulation and mechanical fixing of power plants and substation busbars, and as components of isolating switches. High-voltage post porcelain insulators are generally composed of a solid porcelain body and upper and lower metal accessories through cement glue. With the rapid development of the power industry, the service performance requirements of high-voltage post porcelain insulators (including porcelain bushings) are getting higher and higher. It is of great significance to know their service status in time for the safe operation of the power system. [0003] Because the ...

AI Technical Summary

Problems solved by technology

On the one hand, the reason is that the porcelain pieces sintered at high temperature, if the formula is improper during the production process, the raw materials are mixed unevenly, it is easy to form internal defects of the porcelain pieces, because there is no inherent deformation energy and the toughness is extremely low, it can withstand the mechanical load during operation for a long time And wind and rain, etc., so that the additional stress at the junction of the end skirt and the flange increases, if there are small defects in the porcelain body, it may cause damage

On the other hand, improper operation of porcelain bushings from the factory, transportation, installation and other links may cause damage. If defects cannot be found in time during infrastructure construction, it will bring great hidden dangers to future operation safety.

According to the statistics of the State Power Corporation, the power supply accident caused by the fracture of the porcelain body has become the first failure rate of the power system, causing huge losses and impacts on industrial production and people's lives.

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