Shedding area detection method of RTV coating of insulator and detection device

Abstract

The invention discloses a shedding area detection method of an RTV coating of an insulator and a detection device. The detection method comprises following steps of removing dirt on the surface of the insulator; using colored liquid to smear damaged parts of surface RTV of the insulator; sleeving blank annular Chinese art paper on the surface of the insulator after all the damaged parts are smeared; flattening and arranging the annular Chinese art paper on which colored liquid marks are printed on a platform; acquiring the image of the Chinese art part via an image acquirer and sending the acquired image to a computer; using the computer to carry out profile extraction, area dividing and identification on the colored liquid marks on the Chinese art paper; and calculating quantity of pixel points so as to determine area of the colored liquid marks, i.e., the damaged area of surface RTV coating on the insulator. According to the invention, by taking a rubbing of damaged area on the Chinese art paper, the damaged parts of the surface RTV can be identified in an undamaged manner, and precision degree is high.

Description

technical field [0001] The invention relates to a method for detecting the aging state of an RTV, in particular to a method for detecting the shedding area of ​​an insulator RTV coating and a detection device. Background technique [0002] Due to its strong hydrophobicity, RTV coating can be used to coat insulators to improve anti-pollution flashover performance. RTV is an organic polymer material. During on-site operation, it is eroded by external factors such as sunshine, wind and rain, and surface leakage current. The RTV coating is prone to aging, and cracks and peeling may occur; Pollution flashover performance has declined significantly, which is likely to pose a threat to the safe operation of insulators. Therefore, the detection of the defect area of ​​the RTV coating helps the operation and maintenance personnel to find out the aging condition of the RTV coating insulator in time, and guide the operation and maintenance of the insulator on site. [0003] At presen...

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Problems solved by technology

[0004] Chinese patent CN104048913A discloses a method for judging the aging degree of RTV materials. Combined with hydrophobicity measurement to analyze the aging condition of RTV coatings, the hydrophobicity of RTV is first eliminated by dielectric barrier discharge, and then the static hydrophobic angle is measured to obtain the static hydrophobic angle- Time curve, analyze its characteristic quantity including final value and contact angle change rate, and judge the aging degree of RTV coating by analyzing characteristic quantity; because there is a certain radian on the upper surface of the insulator, and the volume is large, it is not easy to measure it on the hydrophobic contact angle measuring instrument Therefore, it is difficult to analyze the RTV aging situation by measuring the static contact angle on the surface of the insulator

[0005] Chinese patent CN103674967A discloses an RTV coating aging detection system, through image processing water spray image, calculates the area of ​​water droplets and then grades the aging situation, including several steps of quantitative water spraying, image acquisition, image processing, and aging grade classification ; When the water repellency is detected through the image after spraying water, there is a light and dark change on the water droplet, which is reflected in the gray scale change in the grayscale image. This feature makes the contrast between the water droplet and the background not obvious, and the surface of the RTV If there is contamination, the image processing software may misjudge it as water droplets, which will cause errors in the calculation of the area of ​​the water droplets, resulting in an inaccurate judgment of the degree of aging

[0007] Chinese patent CN103760129A discloses a method for detecting the aging degree of room temperature vulcanized silicone rubber anti-pollution flashover coating, using Fourier transform infrared spectroscopy to distinguish the aging state of RTV, and cleaning the dirty surface by sampling the RTV coating on the insulator after operation Finally, prepare the sample, use Fourier transform infrared spectroscopy to test the sample, obtain the infrared spectrum, analyze the absorption peak, and judge whether the RTV coating meets the operation requirements; based on the detection and analysis of the absorption peak of the RTV coating based on Fourier transform infrared spectroscopy, focus on the inspection of the RTV Physical and chemical properties, suitable for theoretically explaining the aging mechanism of RTV, but cannot quickly and effectively distinguish the aging defect of RTV

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