摘要
变压器分体式冷却系统与常规冷却方式的散热器安装位置与安装方式均差别较大。由于分体式冷却系统的特殊性,在进行仿真模型研究时参数制定和模型搭建较复杂,目前对其进行热学仿真的研究较少,且仿真准确性难以验证,需要开展更加深入的仿真研究和试验比对工作。对改造的10 k V油浸式变压器进行分体式冷却方式下的模拟试验,基于模拟试验变压器及分体式冷却器的设置建立了变压器分体式冷却系统的三维流-固-热耦合仿真计算模型,采用有限体积法求解出变压器及分体式冷却器的温度场分布,得到分体式冷却器在不同布置方式下的绕组热点温度。将仿真计算结果与试验数据、IEEE导则计算结果进行比对,结果显示,仿真得到的绕组热点温升、顶层油温升的误差比IEEE导则计算结果的误差分别减小了16.6、15.15 K,验证了该仿真模型的准确性和工程实用性。分析显示,试验模型散热器中心高度增加2 m,热点温度降低了7.9 K;散热器与变压器水平距离缩短3.5 m,热点温度上升了4.1 K,从而获得了分体式冷却布置方式对变压器热点温度变化趋势的影响。
There are obvious differences between separated cooling system and conventional cooling system of trans- formers in the radiator mounting position and installation modes. Due to the specific characteristics of separated cooling system, the parameter setting and model construction in simulation research are complicated, so the researches on thermal simulation for separated cooling system is few, and it is difficult to identify the accuracy of simulation. More deeper simulation research and trial comparisons are needed. The separated cooling experiments of a 10 kV oil- immersed transformer under three different layouts of transformer and radiator are carried out. The three dimensional fluid-structural-thermal coupling simulation model of the tested transformer and its panel-type radiator is established based on the layout of the transformer and the radiator. The finite volume method is adopted to solve the temperature field distribution of transformer and the transformer and its panel-type radiator, the hot spot temperature of transfor- mer is obtained. The simulative results are compared with the experimental data and IEEE standard calculation results, which shows that the errors of winding temperature rise and top oil temperature rise obtained by simulation are respectively 16.6 K and 15.15 K lower than those of IEEE standard calculation results. It verifies the accuracy and engineering practicability of the proposed simulation model. The analysis shows that if the height of radiator center in the tested model is increased by 2 meters ,the hot spot temperature will be decreased by 7.9 K,and if the hori- zontal distance between radiator and transformer is shortened by 3.5 meters,the hot spot temperature will be increased by 4.1 K,which shows the effect of the layout of separated cooling system on hot spot temperature of transformer.
出处
《电力自动化设备》
EI
CSCD
北大核心
2018年第2期177-181,共5页
Electric Power Automation Equipment
关键词
油浸式变压器
分体冷却
流-固-热耦合仿真
三维温度场
oil-immersed transformers
separated cooling unit
fluid-structural-thermal coupling simulation
three- dimensional temperature field
