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Ultra high voltage power bushings are widely used in power systems. In the operation and maintenance process of the ultra high voltage power bushings, testing and analysis are generally based on the equipment itself. If data is obtained from the equipment itself, there will be incomplete data transmission, and the obtained data is generally voltage, current, temperature and other sensing data that are easily obtained from outside power equipment. But for the internal data of power equipment, including online data information such as flow velocity field and pressure field. Therefore, this article attempts to establish the three-dimensional visual simulation model for the digital twin of ultra-high voltage power casing equipment, and further sets key tracking nodes on the three-dimensional configuration model to quantitatively track its multi-dimensional physical quantity change curves and trends. First of all, 3D modeling of large terrain of electric equipment is carried out. Virtual texture technology is used to block and fuse large area and multi resolution texture data. Different detail Hierarchical database model are used to block large area terrain, including texture image selection, ground surface background map selection, texture coverage and grid division. After determining the morphology of the terrain, digital twin 3D modeling analysis was immediately conducted on the power equipment. In the 3D digital twin modeling, the converter transformer body and converter transformer bushing are taken as examples for analysis and explanation. The detailed structure of bushing equipment is considered in the twin model. At the same time, the electrical, thermal and mechanical Multi-physics simulation of converter transformer bushing are coupled and analyzed. Multi-physics simulation simulation results are associated with the key nodes in the 3D digital twin model to realize interaction of physical quantity information between the simulation model and the twin model. The research results of this paper have a good guiding role for the digital operation and maintenance of power equipment, and creatively integrate visual image processing and digital twin Technological convergence to interact, forming a visual simulation research method
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