Optimization of ventilation and heat dispersion for split type of indoor transformer

The three-dimensional ventilation and heat dissipation model of a 110kV indoor transformer substation was established to investigate the effects of the critical natural ventilation temperature, the mechanical exhaust rate, and the size and the position of the vents in the transformer room. Meanwhile, this paper also compared the flow characteristics of the original design and optimized design of the transformer room. Results show that in the original design, the critical temperature of natural ventilation is twenty-two degrees centigrade. As the outdoor temperature rises, the indoor transformer is prone to generate heat accumulation near the bottom area during natural ventilation, causing the heat generated by the transformer unable to be discharged in time, thereby endangering the safe and stable operation of the transformer. When the natural ventilation critical temperature is twenty-two degrees centigrade, the minimum mechanical exhaust rate is two and a half meters per second. Increasing the area of the air vents and reducing the height of the air outlet is beneficial to enhance the heat dissipation effect in the transformer room, and the exhaust temperature is decreased significantly at the same time. Additionally, when the locations of the axial fans are lowered, the average temperature at the exhaust outlet can be reduced by about one to two degrees Celsius. Compared with the original design, the optimized design can meet the ventilation and heat dissipation requirements of the transformer room, thereby achieving the purpose of optimizing air volume and reducing noise.