Improved Method for Calculation of Hot-spot Temperature in Power Transformer 改进的变压器绕组热点温度估算方法
The FBG Monitoring Principle of Transformer Internal Temperature and the Improved Method for Calculation of the Hot-Spot Temperature 变压器内部温度光纤传感监测及绕组热点温度计算改进方法
Using model number X avionics pod as a specific case, numerical calculation of the hot-spot temperature of the DIP was carried out, the results obtained have great value for the thermal design of the electronic components. 以X型电子吊舱为例,对DIP的热点温度进行了数值计算,所获得的瞬态热分析结果对DIP的热设计有重要参考价值。
Hot-spot thermal models taking into account that oil viscosity changes and loss variation with temperature were presented. The models are based on heat transfer theory and a new definition of nonlinear thermal resistances at different ( locations) within a power transformer. 在考虑了油浸变压器油粘度、损耗随温度变化的情况后,根据热传导理论和不同情况下非线性热阻的定义,推导出了可用于估算不同类型变压器绕组热点温度的动态模型。
Elements of transformer thermal impedance matrix are obtained by using the Thermal Dissection Test of a transformer. The correctness and applicability of the computer calculation method for instantaneous-state hot-spot temperature rise of transformer are discussed and proved in the paper. 通过变压器的热解剖试验获得了变压器的热阻抗矩阵元素,论证了变压器热点瞬态温升电算方法的正确性和实用性。
Base on the analysis of the thermal process, it shows that the heat generated by core loss directly related to the top oil temperature, but the determinants of the hot-spot temperature are the resistance loss and the eddy current loss. 通过对变压器铁芯和绕组发热机理的深入分析,认为铁芯损耗产生的热量对顶层油温升会产生直接影响,而绕组热点温升的决定因素是绕组的直流电阻损耗和涡流损耗。
So accurate calculation and reasonable controlling distribution of average temperature rise and hot-spot temperature of transformer that meet the standard requirement are critical to ensure transformer to run safely, economically and high-effectively. 因此准确计算出变压器的平均温升和最热点温升,并进而合理地控制其分布,以满足标准要求,是保证变压器安全、稳定和高效运行的关键。