Method for detecting post-type porcelain insulator damage by employing vibration method

Abstract

The invention discloses a method for detecting a post-type porcelain insulator damage by an employing vibration method. The method comprises the following steps: 1) post-type porcelain insulator three-dimensional finite element modeling: establishing a post-type porcelain insulator three-dimensional finite element model to obtain the stress distribution of the post-type porcelain insulators under two applications of a pipeline bus and an isolation switch, analyzing the cement expansion stress, temperature difference stress, operation stress, freezing stress-added stress concentration areas through ANSYS software; 2) post-type porcelain insulator breakdown diagnosis: combining the common defect of the post-type porcelain insulator, searching the discrimination of the vibration characteristic spectrum under different defects and severe degrees, and establishing the association; and 3) finally verifying correctness and rationality of the post-type porcelain insulator damage by employing the vibration method, and realizing the on-line detection. The method has high detection efficiency, realizes detection of groups of the porcelain, porcelain crack near to a flange port can be detected, and the status detection of central section of the flange, glue filling cement and cast iron flange can be realized.

Description

technical field [0001] The invention relates to the technical field of detection of pillar-type porcelain insulators, in particular to a method for detecting damage of pillar-type porcelain insulators using a vibration method. Background technique [0002] With the rapid development of science and industrial technology, high temperature, high pressure, high speed and high load have become important symbols of modern industry, but its realization is based on the high quality of materials (or components), in order to ensure this For excellent quality, it is necessary to adopt a testing method that does not destroy the original shape or change its performance, and conduct 100% testing on the product to ensure its reliability and safety. In recent years, with the rapid development of the power grid, the number of porcelain post insulators used has also increased year by year, and accidents caused by insulator breakage have occurred from time to time. [0003] To this end, the S...

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Problems solved by technology

[0004] The fracture of the insulator is a sudden phenomenon, but its occurrence is caused by both the insulator itself and the influence of external factors in the operation process. According to the on-site detection results, all the defects of the tube mother post insulators generally occur in the lower section, while The post insulators of knife gates all occurred in the upper section, which shows that the injury of post insulators during operation and operation is the main cause of defects and fractures. At the same time, backward manufacturing technology and low product quality are also the internal reasons for insulator fractures.

[0006] 1) The size of the crack is very small (for example, the depth of the surface crack is only 0.1mm, distributed on the bottom flange surface of the insulator) can damage the insulator;

[0007] 2) It is difficult to predict the length of time from the growth of cracks to the damage of porcelain parts;

[0008] 3) It is impossible to find internal cracks of porcelain parts with naked eyes, including cracks located under the flange surface of insulators, and it is also difficult to find surface cracks with naked eyes;

[0024] Ultrasonic detection must be carried out in the state of power failure, and the detection is time-consuming and laborious at the same time, and it is difficult to realize the general inspection of substation insulators

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