126 kV three-phase common-box basin-type insulator interface defect detection method

Abstract

The invention discloses a 126kV three-phase common-box basin-type insulator interface defect detection method, which comprises the following steps of: performing defect detection on a central conductor-epoxy resin interface of a detected 126kV three-phase common-box basin-type insulator by utilizing an ultrasonic longitudinal wave reflection detection system, establishing an interface defect ultrasonic propagation model, taking an amplitude as a defect characterization quantity, enabling the ultrasonic probe to scan along the detection path, determining the depth of the interface defect, obtaining two-dimensional and three-dimensional images of the interface defect through data three-dimensional reconstruction, determining then the size of the interface defect. The method can be used for factory detection of the basin-type insulator and can also be suitable for field assembly detection of the basin-type insulator. The technical problems that when an X-ray imaging method is used for detecting the interface defects of the basin-type insulator, the sensitivity to the defects with the small width is not high, equipment is large in size, inconvenient to carry and high in price, and X-rays have radiative harm to the human body are solved. The method has the advantages of low detection cost, high detection precision, small size and no X-ray radiation harm to a human body.

Description

technical field [0001] The invention relates to the technical field of detection of interface defects of basin-type insulators, in particular to a detection method of interface defects of basin-type insulators of 126kV three-phase common box. Background technique [0002] Basin insulator is a key component of gas insulated metal-enclosed switchgear (GIS), consisting of metal inserts, epoxy insulation and metal flanges, which play the role of electrical insulation, isolation of gas chambers, and support conductors. At the same time, the basin insulator is also the weakest insulation link in the gas-insulated metal-enclosed switchgear. The faults caused by basin insulators account for a considerable proportion of the insulation faults of gas-insulated metal-enclosed switchgear. Among them, the interface defects at the interface between the central conductor of the basin insulator and the epoxy insulating material are mainly due to artificial faults during the assembly process....

AI Technical Summary

Problems solved by technology

[0004] The invention provides a 126kV three-phase common box basin-type insulator interface defect detection method, which is used to solve the problem that the detection of basin-type insulator interface defects using X-ray imaging method has low sensitivity to defects with small width and the equipment is bulky , not easy to carry, expensive, X-rays have technical problems of radiation hazards to the human body, and have the advantages of low detection cost, high detection accuracy, small size, and no X-ray radiation hazards to the human body

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