大电流开关柜热管散热实验研究

Experimental study of thermal dissipation of large current switchgear with heat pipe

作为重要输电设备的大电流开关柜,其关键部件静触头安装于树脂塑料触头盒内,空气对流空间狭小,散热效果较差,容易引发开关触头的过热、剧烈氧化和烧融等故障现象,给供电系统的安全性和可靠性带来隐患。为了强化开关柜静触头的散热,控制其温升达到国家相关行业标准的要求,文章以KYN44A-12大电流开关柜为研究对象,设计了3种形式的热管散热装置,安装于触头盒内以强化静触头的散热能力;利用光纤温度在线监测系统,对安装有热管的开关柜静触头温升进行了实验研究。实验结果表明,热管蒸发段的结构形式对开关柜静触头的散热有着重要的影响,采用蒸发段呈"L"形结构的热管换热器,散热效果明显,使开关柜母线室及电缆室内静触头的温升得到了有效控制。

Large current switchgear is the vital electric transmission device .Being the contacts installed in the resin contact-boxes ,the condition of narrow air convection space and abominable thermal dissipation leads to overheating ,vigorous oxidation and burn melt fault frequently ,and that makes a huge threat to the security and reliability of the power supply system .Based on the purpose of enhancing its cooling efficiency and mak-ing the temperature rise reduced ,the KYN44A-12 switchgear was set as the research object and three types of heat-pipe exchangers were designed and installed in the contact-boxes .And then the experimental tests on the temperature rise of contacts were taken with the help of optical fiber online temperature monitoring system . The experimental results showed that the form of the structure of heat pipe was fatal to contacts thermal dissi -pation and the exchanger with L-type evaporation zone had a good effect .Finally ,the temperature rise of con-tacts had been controlled effectively .