Detection and Diagnosis of Defect in GIS Based on X-ray Digital Imaging Technology

Abstract

For better application of X-ray digital imaging technology in defect detection in Gas Insulated Switchgear (GIS), it is essential to investigate the typical defect and establish the defect database, which has not been adequately performed in previous work. Systematic experimental research is also needed to accumulate data and experience. In this research, an experimental platform, including Computed Radiography (CR) imaging system and a GIS model, is built, and extensive tests of different kinds of typical defects are studied. The influence X-ray irradiation on SF6 under different tube voltage levels is firstly examined, which proves that the withstand voltage of SF6 gas has not been affected and no dissociation has been found. Then, several kinds of defects are tested by X-ray digital imaging technology. The successful application examples of “visual” detection of defects further prove the practicability and validity of the X-ray digital imaging technique. Finally, the image database of typical defects inside of GIS is established and the defect risk is also analyzed in three levels, which would be useful for the defect severity diagnosis and risk assessment.

SF6Decomposed Component Analysis for Partial Discharge Diagnosis in GIS: A Review

“…Similar to electrical discharge and thermal induced decomposition, SF6 decomposes when exposed to x-ray irradiation. In certain applications, x-ray units are used in the vicinity of SF6insulated equipment for the purpose of equipment defect detection using digital imaging technology [46][47] [48]. Xray has been introduced as a defect detection technique due to its ability to penetrate and visually provide results for the internal status of GIS.…”

“…This classification approach uses techniques such as the PD measurements, PD phase resolution (PRPD) pattern and X-ray irradiation to identify the types of defects in GIE. X-ray digital imaging technology was applied to detect various defects: metal and flaky particles, Loosened Metal Screws, and different adsorbent cover materials [46]. The investigation concluded that the technique for visually detecting defects in GIS was effective.…”

MCTSR: A super‐resolution method for defects in gas‐insulated switchgear X‐ray images based on multi‐scale contextual transformers

“…Recently, several scholars have introduced X‐ray digital radiography technology to realise visualisation results of the components inside GIS equipment [9]. X‐ray technology gets the advantages of non‐contact, high penetration, and non‐destructive inspection [10].…”

Real-Time High-Performance Laser Welding Defect Detection by Combining ACGAN-Based Data Enhancement and Multi-Model Fusion

“…Conventional nondestructive testing methods are widely used but they have some limitations [5][6][7]. For example, visual testing can easily miss detection [8][9][10]; radiographic testing has radiation risk and its equipment cost is high [11]; magnetic particle testing and penetration testing can locate the defect position but cannot specifically display its shape; and eddy current detection and other signal detection technologies can not directly reflect the defect shape [12].…”