Analysis of Multi Physical Field Parameter Mapping for Unbalanced Operation of Transformers Based on Digital Twins

Aiming at the problem that it is difficult to effectively measure the changes in winding current, internal magnetic leakage, and vibration characteristics of transformers during three-phase unbalanced operation in distribution networks, a transformer unbalanced operation twin model based on digital twin technology is proposed. Firstly, the physical entity information of electromagnetic mechanical coupling is collected through transformer dynamic simulation experiments, and a virtual twin entity is established and simulated to simulate the internal physical form of the transformer under different states. Secondly, extract the physical parameters of the electromagnetic and mechanical fields inside the transformer, and establish a twin database based on the fusion of virtual and real information. Then, the potential correlation between electromagnetic field and mechanical field is studied using winding current as a twin bond, and its virtual mapping relationship is established; Finally, use observable electrical information to describe the changes in unobservable physical information such as magnetic fields and mechanical fields. The model constructed in this article can provide a new means for multi physical evolution analysis of transformer unbalanced operation.