基于热管散热的大电流开关柜触头温度场分析

Analysis of Contacts Temperature Field in Large Current Switchgear Based on Heat Pipe

大电流开关柜的关键部件静触头,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的带来隐患。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,将热管散热装置安装于KYN44A-12大电流开关柜的静触头上,利用有限元方法对静触头的温度场进行了仿真分析,并在相应工况条件下对仿真结果进行了实验验证。研究结果表明,采用热管散热装置后,开关柜静触头的温度被控制在60℃以下,母线室及电缆室内静触头的温升得到了有效控制,从而提高了开关柜的通流能力和设备利用率。

The vital part, fixed contacts of Large current switchgear were installed in the resin contact-boxes. Narrow air convection space and abominable led to overheat, vigorous oxidation and burn melt fault frequently, and that made a huge threat to the security and reliability of the power supply system. Based on the purpose of enhancing its cooling efficiency and making the temperature rise meet the national standards, the heat-pipe exchangers were set in KYN44A-12 switchgear, the experimental tests were taken after simulating temperature field of fixed contacts with finite element method（FEM） to confirm the simulation results. Finally the results showed that the temperature of contacts had been lower than 60 ℃ after using the heat-pipe exchangers, the contacts temperature in busbar room and cable room was under control and peak current and equipment effectiveness would be improved.