Study on temperature distribution of box-type distribution room under different load and ventilation conditions

As an important part of the power transmission and distribution network in the power system, many problems in the box-type distribution room deserve attention. Especially the overheating problem will seriously threaten the safe and stable operation of the devices in the power distribution room. To promote heat dissipation and ensure the normal operation of devices in the power distribution room, this paper established a three-dimensional thermal-flow field model for the box-type power distribution room based on the finite element principle. Through this simulation model, the temperature distribution of the box-type distribution room under different dry-type transformer load and ventilation conditions of the distribution room is studied. Besides, this paper found the relationship between the hot-spot temperature and load rate of the dry-type transformer and the inlet air velocity at the vent, and gave an empirical formula through the least-squares fitting method. Finally, it was found that when the inlet air velocity at the vent is set to 0.1m/s, the cost performance of heat dissipation is high. The research in this article is useful to guide the ventilation of the box-type distribution room and the operation of dry-type transformers.