With the continuous development of digital power grid technology, 3D design has achieved some phased results in the engineering design stage. However, there is still a lack of lightweight 3D application technology in the subsequent stages of construction, commissioning, and operation and maintenance. From the perspective of power grid information model engineering application, an efficient 3D scene composition method was designed in this study for large-scale cable 3D engineering to ensure the balance of space nodes. Besides, an occlusion culling method matching the structure of the scene graph was proposed to improve the model query efficiency and reduce the pressure on the rendering pipeline. Finally, the rapid imaging of 3D scenes based on the digital model information of large-scale cable projects was realized. This study strengthened the promotion of 3D design results to the stages of construction and subsequent operation and maintenance and provided a reliable guarantee for the creation of digital twins for power grid projects.