一种提高中低压开关柜电流母排散热效率的措施  

Research on measure to improve heat dissipation efficiency of current busbar in medium and low voltage switchgear

作　　者：马永超 李瑞 赵伟[1] 徐斌 黄松岭[1] 李世松[1] MA Yongchao;LI Rui;ZHAO Wei;XU Bin;HUANG Songling;LI Shisong(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Siemens Medium Voltage Switchgear Technology(Wuxi)Co.,Ltd.,Wuxi 214145,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]西门子中压开关技术(无锡)有限公司,江苏无锡214145

出　　处：《电工电能新技术》2023年第6期62-70,共9页Advanced Technology of Electrical Engineering and Energy

摘　　要：电流母排是中低压开关柜中主要的发热部件之一,有效抑制其温升对确保开关柜安全可靠运行具有重要意义。抑制母排温升的现有措施大多不够经济或操作、实施较为复杂。本文依据传热学理论,提出采用适当厚度、传热系数较好的绝缘材料对电流母排进行包裹,以提高母排散热效率,从而达到抑制母排温升的目的。理论推导得到了电流母排散热效率的解析模型,数值计算和有限元仿真分析均验证了所提出措施的有效性;基于解析模型分析了该措施的适用范围;并通过物理实验验证了所提出方法的有效性。研究结果表明,针对多种常用型号的母排,其温度随绝缘层厚度的增加先降低,后升高;包裹用绝缘材料的导热性能越好,散热效果改善越明显;本文提出的改善散热措施适用于采用自然对流散热的中低压开关柜。The current busbar is one of the main heating components in the medium and low voltage switchgear.It is of great significance to effectively suppress its temperature rise to ensure the safe and reliable operation of switchgear.The existing measures to suppress the temperature rise of the busbar are either uneconomical or complicated to operate.In this paper,it is proposed to wrap the insulation layer outside the current busbar to improve its heat dissipation efficiency,thereby suppressing the temperature rise of the busbar.The analytical model of the heat dissipation efficiency of the current bus is obtained by theoretical deduction,and the effectiveness of the proposed measure is verified by numerical calculation and finite element simulation analysis.In addition,the applicable scope of the measure is also analyzed based on the analytical model.And the effectiveness of the method is verified by physical experiments.The results showed that,for the different types of current busbar,the temperature of busbar surface first decreased and then increased with the increase of insulation layer thickness.The better the thermal conductivity of the insulating layer is,the more obvious the improvement effect is.The measure proposed in this paper is applicable to the medium and low voltage switchgear with natural convection heat dissipation.

关 键 词：中低压开关柜 电流母排 散热效率 绝缘材料 自然对流 

分 类 号：TM591[电气工程—电器]