Design and Optimization of Ventilation Environment in the Main Transformer Room of 220 kV Indoor Substation

This study focuses on the main transformer room of a 220 kV indoor substation in Chongqing, China. Employing a combination of theoretical calculations and Computational Fluid Dynamics (CFD) simulations, it investigates the indoor working environment temperature under both standard and extreme operational conditions, specifically examining ventilation-based heat dissipation methods. Additionally, the study delves into the use of air conditioning as a cooling measure under extreme conditions, optimizing the positioning of air vents and the system's cooling capacity. The findings reveal that under standard conditions (ambient temperature of 31.7 °C), natural ventilation suffices to maintain the required working environment temperature of around 40℃. However, under extreme conditions (ambient temperature of 40.2 °C), the implementation of air conditioning is crucial for the safe operation of the equipment. It was observed that an air conditioning system with a cooling capacity of 140 kW, which is close to or exceeds the heat dissipation capacity of the equipment, can maintain an indoor temperature of approximately 36 °C. This study provides valuable insights into the design and optimization of climate control systems in high-voltage indoor substations, ensuring operational safety and efficiency under varying environmental conditions.