基于ANSYS的户外高压隔离开关触头发热机理研究

Research on heat generation mechanism of outdoor high voltage isolating switch contact based on ANSYS

针对户外高压隔离开关触头过热现象,对动静触头接触部分作了认真分析,将触头三维模型简化后,采用有限元软件ANSYS进行热稳定性仿真计算。分析发现,接触电阻大于100μΩ、接触电流高于400A时,触头接触部分易发热甚至过热;大电流流通时,接触面积变化越大对接触部分温升的影响越大;风速越大对触头散热的影响越平缓,环境温度变化值等同于相同条件下触头温升的变化值。通过触头温升试验验证了仿真分析结论。

The finite element software ANSYS was used to simulate and calculate the thermal stability after the 3D contact terminals were simplified for the overheating of outdoor high-voltage disconnecting switches.After careful analysis,when contact resistance was greater than 100μΩand pick-up current was greater than 400 A,the contact segment of contact terminals would be easy to get heated even overheated.The larger the current was,the greater efect on the temperature rising of contact segment would be,and the stronger the wind was,the efect on the heat dissipation of contact terminals would be much gentler.And the change in the environ mental temperature was equal to the temperature rising of contact terminals under the same condition.And the results of the analysis were verified by the contact temperature rise test.