Visible to the public Detection of Composite Insulators Inner Defects Based on Flash Thermography

TitleDetection of Composite Insulators Inner Defects Based on Flash Thermography
Publication TypeConference Paper
Year of Publication2017
AuthorsQiao, Z., Cheng, L., Zhang, S., Yang, L., Guo, C.
Conference Name2017 1st International Conference on Electrical Materials and Power Equipment (ICEMPE)
Date PublishedMay 2017
ISBN Number978-1-5090-5736-8
Keywordsair defects, Air gaps, composability, composite insulator, composite insulator inner defect detection, composite insulators, flash thermography, heat diffusion, heat loss, Heating systems, Human Behavior, human factors, infrared imaging, Insulators, mathematical analysis, mathematical analysis model, Metrics, non-destructive testing, Pollution, Pollution measurement, power transmission lines, pubcrawl, resilience, Resiliency, Surface contamination, Surface treatment, Temperature measurement, thermal diffusion, transmission line

Usually, the air gap will appear inside the composite insulators and it will lead to serious accident. In order to detect these internal defects in composite insulators operated in the transmission lines, a new non-destructive technique has been proposed. In the study, the mathematical analysis model of the composite insulators inner defects, which is about heat diffusion, has been build. The model helps to analyze the propagation process of heat loss and judge the structure and defects under the surface. Compared with traditional detection methods and other non-destructive techniques, the technique mentioned above has many advantages. In the study, air defects of composite insulators have been made artificially. Firstly, the artificially fabricated samples are tested by flash thermography, and this method shows a good performance to figure out the structure or defects under the surface. Compared the effect of different excitation between flash and hair drier, the artificially samples have a better performance after heating by flash. So the flash excitation is better. After testing by different pollution on the surface, it can be concluded that different pollution don't have much influence on figuring out the structure or defect under the surface, only have some influence on heat diffusion. Then the defective composite insulators from work site are detected and the image of defect is clear. This new active thermography system can be detected quickly, efficiently and accurately, ignoring the influence of different pollution and other environmental restrictions. So it will have a broad prospect of figuring out the defeats and structure in composite insulators even other styles of insulators.

Citation Keyqiao_detection_2017