Because of the advantages of composite insulators as below: high strength, high tolerance flash performance, easy maintenance and many others advantages of manufacturing and widely applied in the power system, composite insulators are breaking the long-term dominance of porcelain and glass insulators.
On the use of quantitative terms, China has become the second largest country after the United States in the use of composite insulators. But with the run-time increasing, the number of composite insulators failure information is gradually increasing.
Obviously, at the same time improving the formulation and manufacturing process, improve the quality of composite insulators, to carry out targeted studies run of composite insulators detection technology has great significance for the protection of the safe operation of the grid.
Currently one of the running composite insulators detection techniques is: Direct observation method, which is for detecting the external defects of composite insulators.And it uses binoculars to observe at the tower to discover common surface defects such as jacket, sheds, fittings and other parts of presence of cracks, with or without electrical erosion, powder, trackings etc. But the ground was observed unreliable, it is difficult to find a plethora of failures such as dendritic channels within the composite insulators.
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