Simulation Analysis on Temperature Field of 35 kV Dry-type Air-core Reactor Based on Fluent

Inter-turn short current is the main cause of the failures of dry-type air-core reactors. The properties of the interturn insulation material are influence by the temperature. Therefore, the temperature field analysis is of great importance in the study of insulation failure. In this paper, the software Fluent is used to simulate the temperature field of reactors in normal operation condition and airway obstruction condition. The results show that: in normal operation condition, the temperature of inner packages is obviously higher than the outer packages. The temperature is higher on the upper part of each package with a difference of over 20 K, the highest point is 10%~20% to the top;in the airway obstruction condition, and the nearby package temperature rises significantly 30-40 K compared to normal operation condition. Airway obstruction causes less temperature rise to the non-adjacent package. Therefore infrared thermometry cannot reflect the local overheating of the inner package. The temperature simulation of different conditions provides valuable data for the insulation degradation study and failure analysis.