Abstract: To address the challenge that the internal structures of enclosed power equipment such as GIS and GIL are difficult to observe directly, this study investigates the on-site safety conditions and engineering applicability of portable X-ray digital imaging (CR/DR) technology and establishes a field-applicable non-disassembly radiographic inspection method. By analyzing SF? decomposition products after X-ray exposure, this study evaluates the potential impact on the internal gas. During GIS maintenance, repair quality is verified by comparing images acquired under normal conditions with those obtained after maintenance. In on-site GIL applications, the radiographic setup is arranged according to spatial constraints, and multi-angle imaging and comparative analyses are performed for critical components. The results show that, under the inspection conditions used, X-ray exposure does not induce SF? gas decomposition. Image comparison identifies positional deviations of internal GIS components and supports the evaluation of repair quality. Multi-angle radiography combined with comparative analysis effectively determines the structural relationships and integrity of internal GIL components, providing a basis for post-emergency repair verification and safety assessment. The study demonstrates that, provided SF? environmental safety is ensured, X-ray digital imaging enables non-disassembly visualization and verification of the internal structures at critical locations in GIS/GIL. This approach compensates for the limitations of conventional visual inspection and online monitoring in identifying concealed defects and in maintenance acceptance, and it has practical value for engineering deployment.