Detection method and system for detecting bonding defects inside composite insulator

Abstract

The invention discloses a method and a system for detecting bonding defects inside a composite insulator. The method comprises the following steps of acquiring a visible light image, a first speckle image and a second speckle image of a detected composite insulator through laser array equipment, thermal excitation light source equipment, and imaging equipment; performing operation processing on the first speckle image and the second speckle image through the data processing equipment to obtain an interference fringe image and a phase image; and performing Gaussian filtering processing, drawingan edge image to integrate with the visible light image to obtain an integrated image, and identifying bonding defects inside the composite insulator. Through the method disclosed by the invention, the rapid, accurate, non-contact and visual detection of the bonding defects inside the composite insulator is realized, the defection effect on the tiny bonding defects inside the composite insulatoris good, an aim of efficiently and accurately detecting the bonding defects inside the composite insulator is realized; and the method is simple in operation, visual in imaging, the influence by the operation subjective factor of a detector is small, and the objectivity and the scientificity of the detection can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of electric equipment detection, in particular to a detection method and system for internal bonding defects of composite insulators. Background technique [0002] In a complex operating environment, the development of internal defects may cause abnormal heating and insulation failure of the composite insulator, and in severe cases, it may cause breakdown, string drop, breakage and other accidents of the composite insulator, which poses a great threat to the safe and stable operation of the power system . Internal bonding defects of composite insulators are the main cause of accidents such as abnormal heating and fracture of insulators. The detection of internal bonding defects is of great significance to reduce the failure rate of composite insulators. [0003] At present, there are mainly two detection methods for the internal bonding defects of composite insulators. The first one is the anatomical gradi...

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Problems solved by technology

The second is the ultrasonic testing method, which uses ultrasonic waves to detect the internal bonding of composite insulators. The ultrasonic testing method has the advantages of high sensitivity, strong penetrability, and fast detection speed. There are certain requirements on the operating level of the testing personnel, and the smearing of the couplant will also have a certain impact on the outer insulating surface of the composite insulator

[0004] The above detection methods have great limitations on the detection methods of the internal bonding defects of composite insulators. Although the existing methods can detect the internal bonding defects of composite insulators, these detection methods are used to dissect and grade composite insulators or use them on the surface of composite insulators. All couplants will damage the composite insulator itself to a certain extent, and the operating level and experience of the testing personnel are greatly affected by subjective factors, and the proposed testing results are prone to errors and missed detections.

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