Rapid Calculation of Temperature Rise in Dry‐Type Transformer Interturn Short‐Circuit Based on Singular Value Decomposition and Response Surface Method

With the progress of science and technology, the application of dry‐type transformers in distribution networks is increasing day by day. However, the problems of short‐circuit heat, bias heat, and overload heat in the operation of dry‐type transformers will pose a threat to the service life and insulation performance of transformers. The finite element simulation of temperature rise in dry‐type transformers has drawbacks such as long calculation times and high memory usage. To solve this, this paper presents a rapid method for calculating the temperature rise during interturn short‐circuit fault (ISCF). A 3D reduced order model for the temperature rise of the dry‐type transformer ISCF is developed. This model enables the rapid calculation of hotspot temperatures. The ISCF experiment was conducted on a customized dry‐type transformer. The feasibility of the reduced order method was verified by comparing the experimental results with the simulation results. The application of model order reduction can simplify the model to the required error, speed up the simulation, and serve as a reference for improving the efficiency of digital twin technology in dry‐type transformers. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.