绕组损耗分布对油浸式变压器温升的影响分析  

Analyses of Effect of Winding Loss Distribution on Temperature Rise of Oil-immersed Transformer

作　　者：马永强[1,2] 刘刚 李德波[2] 郑直 MA Yongqiang1,2, LIU Gang1, LI Debo2, ZHENG Zhi1(1. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North ChinaElectric Power University, Baoding 071003, China; 2. Electric Power Research Institute ofGuangdong Power Grid Corporation, Guangzhou 510080,Chin)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003 [2]广东电网有限责任公司电力科学研究院,广东广州510080

出　　处：《华北电力大学学报（自然科学版）》2018年第3期34-43,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51407075);中国南方电网科研资助项目(GDKJQQ20153004);河北省自然科学基金资助项目(E2015502004)

摘　　要：在绕组温升计算过程中,绕组损耗分布直接影响油流和温度分布。为了更准确地研究油浸式变压器温度场分布,建立了一台油浸式电力变压器的低压绕组二维流体场-温度场计算模型,对绕组热源的处理:用每饼的欧姆损耗和涡流损耗代替传统的整体平均损耗,并且采用Fluent UDF函数在每次迭代时动态地校正温度依赖变量。同时对比分析了损耗温度效应、涡流损耗以及热源分布对绕组油道中油流速度及温度分布的影响。分析结果表明:考虑损耗的温度效应后,各个分区和整体绕组的热点均发生上移,整体绕组的热点温度增加25.6 K,热点位置偏差为7个线饼;考虑涡流损耗使得各个线饼温度增大,尤其在各个分区的局部热点附近,温度的增加更加显著;热源分布对绕组温度分布的影响主要集中在绕组端部。In the calculation of winding temperature rise, the loss distribution of winding directly affects the oil flowvelocity and temperature distribution in the winding. In order to calculate the temperature field of oil-immersed trans-former accurately,this paper established a physical calculation model of winding temperature rise with the low voltagewinding structure of an oil-immersed power transformer as its prototype. The heat source of winding was applied by thesum of the ohmic and eddy losses in each disc instead of the traditional uniform loss in the calculation process. The pa-per adopted the Fluent User-defined function in the CFD solver to correct the temperature-dependent variables accordingto its average temperature at each iteration. Meanwhile, the influence of loss temperature effect？ eddy loss and heatsource distribution on oil flow velocity and temperature distribution in winding were compared and analyzed. The resultsshowed that the temperature effect of the loss caused the hotspot to move up both in each pass and the whole windingand the temperature of hotspot to increase by 25. 6 K. The position discrepancy of hotspot was 7 discs. The eddy lossescaused temperature rise in each disc-type winding, and the maximum temperature rise occurred near the local hotspot ineach pass. The influence of the heat source distribution on the temperature distribution of the winding mainly at thewinding end.

关 键 词：油浸式变压器 饼式绕组 Fluent UDF 损耗 温度分布 

分 类 号：TM401[电气工程—电器]