摘要
针对由太阳辐射及设备内部发热导致变电站户外箱体温升过高进而引发设备故障及安全风险的问题,本文旨在探究箱体结构、表面颜色、发热功率及热源分布等关键因素对箱内温度的影响机制,为实现箱体温升的有效控制与箱体设计的优化提供依据,以保障设备可靠运行。通过模型仿真和样机测试等手段,本文详细研究了箱体结构、表面颜色、热源等因素对户外箱体内部温度的影响程度。研究表明:箱体采取双层结构时,箱内温升低于相同条件下的单层结构箱体温升;箱体表面的黑度越小,箱体的温升越低;喷涂防辐射涂层的箱体在一定范围内可降低箱体温升;相同发热功率条件下,热源数量越多、分布越分散,越利于箱体散热;无发热源时,太阳辐射是影响变电站户外箱体温升的主要因素,箱体表面的黑度越低,对太阳辐射的吸收越少,在同一太阳辐射条件下,双层结构箱体的温升低于单层结构箱体。综上,户外箱体宜选择双层结构设计和浅色系表面;有发热源且发热功率不可忽略时,热源是影响变电站户外箱体温升的主要因素,发热总功率一定的情况下热源越分散有利于散热。
Aiming at the problem that the temperature rise of outdoor cabinets in substation is too high due to solar radiation and internal heating of equipment,which leads to equipment failure and safety risk,this paper intends to explore the influence mechanism of key factors such as cabinet structure,surface color,heating power and heat source distribution on the temperature in the cabinets,so as to provide basis for the effective control of cabinets temperature rise and the optimization of cabinets design,so as to ensure the reliable operation of equipment.Detailed research is conducted on the impact of factors such as cabinet structure,surface color,and heat sources on the internal temperature of outdoor cabinets through model simulation and prototype testing.The results show that when the cabinet adopts a double-layer structure,the temperature rise inside is lower compared to a single-layer structure under the same conditions.The lower the surface emissivity of the cabinet,the lower the temperature rise.Applying an anti-radiation coating to the cabinet can reduce its temperature rise within a certain range.Under the same heating power conditions,a greater number of dispersed heat sources facilitates better heat dissipation.In the absence of heat sources,solar radiation is the primary factor influencing the temperature rise of outdoor cabinets in substations.The lower the surface emissivity of the cabinet,the less solar radiation it absorbs.Under the same solar radiation conditions,double-layer cabinets exhibit a lower temperature rise compared to single-layer cabinets.Therefore,outdoor cabinets should be designed with a double-layer structure and a light-colored surface.When heat sources are present and their heating power cannot be neglected,the heat sources become the primary factor influencing the temperature rise of outdoor cabinets in substations.With a constant total heating power,the more dispersed heat the source distribution are the more favorable it is for heat dissipation.
作者
李端姣
刘建明
孙文星
张丽
李智
付强
唐念
梁永超
林木松
曹鹏飞
甘雄涛
LI Duanjiao;LIU Jianming;SUN Wenxing;ZHANG Li;LI Zhi;FU Qiang;TANG Nian;LIANG Yongchao;LIN Musong;CAO Pengfei;GAN Xiongtao(Guangdong Power Grid Co.,Ltd.,China Southern Power Grid,Guangzhou 510180,China;Guangdong Provincial Key Laboratory of Electric Power Equipment Reliability,Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,China Southern Power Grid,Guangzhou 510080,China;XJ Electric Co.,Ltd.,Xuchang 461000,China)
出处
《电力学报》
2025年第5期381-393,共13页
Journal of Electric Power
基金
中国南方电网科技项目(GDKJXM20230771,030000KC23070008)。
关键词
变电站
户外箱体
双层结构
温度
影响因素
substation
outdoor cabinet
double-layer structure
temperature
influencing factor
