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UHV converter transformer has complex insulation structure and huge volume, and bears the effect of high current and high voltage for a long time. It will cost a lot to carry out on-site operation and maintenance test. At present, digital twin technology is becoming more and more perfect, and gradually introduced into the power industry from automobile, aviation and other manufacturing industries. Based on this, this paper introduces the digital twin technology into the highend power equipment of UHV converter transformer. Considering the complex structure of converter transformer and its outgoing line device and converter bushing area are important typical accessories, this paper focuses on the construction of digital twin 3D model in this area, and carries out on-site operation and maintenance simulation test and high current functional response analysis under high voltage load. The digital twin model in the outgoing line device area is constructed according to the electrical, thermal and mechanical multi physical field simulation model. In fact, it bears the on-line voltage waveform and current waveform, which are monitored by optical sensors, and realizes the interactive linkage between the on-site operation parameters and the loading data of the digital twin model. On the other hand, the intelligent extraction and identification of material area in the digital twin model is realized, and the material parameter performance can be changed according to the physical field environment, so as to adapt to the structural design and performance evaluation of different operating environments. This paper focuses on the 3D construction of digital twin model in the outgoing area of converter transformer. Its research method can be extended to key components such as converter body winding structure, oil paper insulation area and on load switch. The research results of this paper can provide theoretical guidance and technical reference for the insulation structure design of the converter transformer, especially for the structure design, operation and maintenance of outgoing device area.
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