低压智能配电台区散热特性研究

为解决柱上低压智能配电台区自然对流散热条件下关键元件温升过高的问题,计算了太阳辐射环境下自然对流散热所需的冷却风量,设计了台区机柜热流通道,基于CFD技术仿真计算了侧风、迎风和背风状态下铜排和智能电容器的温升。仿真结果表明,智能配电台区补偿室前后门及侧门上、下方分别开设百叶通风孔,在任意风向条件下智能电容器均能满足温升要求; 为保证40 ℃环境温度时铜排表面温度不超过75 ℃,需在进出线室前后门上下方分别开设百叶通风孔。

Study on Heat Dissipation Characteristics of Low Voltage Intelligent Distribution Station

The temperature of the key components rises greatly under the condition of natural convection heat dissipation in the low-voltage intelligent distribution area. To solve the problem, the cooling air volume for the natural convection heat dissipation in the solar radiation environment was calculated and the heat passage of the cabinet of the power in the distribution area was designed. In addition, the temperature rise of the copper bars and the smart capacitor in the crosswind, upwind and leeward state was simulated and calculated based on the CFD technology. The simulation results showed that the demands for temperature rise could be satisfied by the intelligent capacitor under any wind direction when the ventilation grills were set both on the upside and downside of the front door and the back door as well as the side door of the compensation chamber of the area. In order to ensure the surface temperature of the copper bars not to exceed 75 ℃ when the ambient temperature is 40 ℃, the ventilation grilles should be built both on the upside and the downside of the front and the back door.