干式空心电抗器温度场计算与试验分析

摘要

基于电磁学和传热学理论,建立干式空心电抗器三维温升计算模型,首次考虑了星形支架损耗对包封热点温度的影响.应用损耗分离方式计算包封和星形支架的热源,采用有限容积法直接求解电抗器流体场与温度场,获得电抗器温度场分布特性,分析并总结包封轴向及径向温度分布规律.计算结果表明:星形支架损耗为包封损耗的3.7％,对包封热点温度的影响约为3K.最后,通过电抗器温升试验验证了温度场计算的准确性,为干式空心电抗器温升计算以及温升监测提供了理论基础和参考依据.%Based on the theories of electromagnetics and heat transfer,3D calculation model of temperature rise for dry-type air-core reactor is established,The effect of star-type frame loss on hot spot temperature of the encapsulations is considered at the first time.The heat sources of encapsulations and star-type frames are computed by loss separation method,the finite volume method is applied to solve the fluid field and temperature field of the reactor directly,the temperature distribution characteristics are acquired,and the axial and radial temperature distributions of encapsulations are analyzed and summarized.The calculation results show that the loss of star-type frame is 3.7％ of the encapsulation loss,the influence of star-type frame loss on the hot spot temperature of the encapsulations is about 3 K.Finally,the accuracy of the temperature field calculation is verified by temperature rise test of the reactor,that provides a theoretical basis and references for temperature rise calculation and monitoring of dry-type air-core reactor.