基于CFD模拟的全户内模块化变电站室内通风散热及气流组织优化设计OA

The fully indoor modular 110 kV smart substation,due to its limited indoor space and concentrated heat-ing of electrical equipment,has exposed such problems as high indoor average temperature,excessive partial tem-perature and difficult temperature and humidity control,which is not conducive to the efficient and safe operation of electrical equipment.Therefore,in this paper the indoor dissipation and airflow organization effect is improved by controlling the inlet and outlet parameters.First,the current status of ventilation and heat dissipation in standard-ized design and prefabricated construction of substation as well as the heat generation of electrical equipment are analyzed.Then,overall 3D physical model of the substation is set up based on the real situation and the tempera-ture field distribution as well as air flow distribution of simulation are simulated and modeled.The numerical simu-lation results show that the average indoor temperature is 48℃,which is higher than the indoor temperature design requirements in 110-A2-6 design scheme,in which the average temperature of the capacitor compartment is the highest,which is 55℃when the fan is not operated.It is found through the analysis of the velocity field that the air flow rate near the electrical equipment is less than 1 m/s,and the indoor airflow vortex nearly coincides with the high temperature area.Finally,the design of the optimization scheme is performed.Since the temperature of the the capacitor compartment after switching on the axial fan is 45℃and as for the characteristics of the capacitor com-partment as well as ensuring its constant ventilation volume,three optimization schemes are propsoed by changing the size and position distribution with consideration of the air flow organization distribution.It is found by compari-son that the ventilation system natural air inlet+mechanical exhaust is arranged on the same side,the air outlet is arranged above the disconnector frame by the ventilation tube and the shutter width ratio is increased 0.48,the tem-perature in the capacitor compartment can be reduced to 37℃,which provides a case reference to solve the prob-lem of ventilation and heat dissipation in fully indoor modular substation.