Thermal Simulation Model of Oil-Immersed Transformer and Analysis of Temperature Rise Characteristics Under Winding Fault

It is significant for safe operation and fault detection of transformers to know the temperature field distribution characteristics and the temperature variation rules accurately under fault conditions of oil-immersed transformer. In this paper, a thermal simulation model for oil-immersed transformer is established, and a faulty module is added to simulate the temperature field distribution under different fault parameters. Simulation results show that: compared to normal operating conditions, the overall temperature of transformer with winding fault increases, and a new winding hot spot appears at the location of the winding fault. As the heating power of the faulty coils increases, the new hot spot temperature increases, and the overall temperature of the oil-tank outer surface increases. With the rise of the fault coils’ height, the position of the new hot spot increases, and the range of outer surface temperature increases. This study can provide guidance for condition detection and fault diagnosis of transformers.