摘要
准确计算变压器绕组温升及热点需要考虑绕组匝间绝缘的影响,而考虑匝间绝缘的精细建模的建模工作量和剖分网格量都非常大。针对此问题,提出了一种基于最小热阻力法则的等效导热系数计算方法,分别计算油浸式电力变压器绕组的轴向等效导热系数和径向等效导热系数,从而可以获得等效导热系数下的饼式绕组来模拟考虑匝间绝缘的实际绕组结构。为了验证所提方法的有效性,建立了油浸式变压器绕组温升仿真模型,将等效模型的仿真结果与考虑匝间绝缘的仿真结果进行温升和热点的对比分析。结果表明二者的温升和热点位置基本一致,且等效模型减少了72%的网格剖分量,验证了所提方法的有效性。将所提方法应用于换流变压器网侧和阀侧绕组的温升和热点分析,得到了换流变压器的绕组温升和热点分布。
Accurate calculation of transformer winding temperature rise and hot spot need to consider the influence of winding interturn insulation,but the workload of fine modeling and the amount of meshing considering winding interturn insulation are very large.To solve this problem,this paper presented a method based on the minimum thermal resistance rule to calculate the equivalent thermal conductivity of oil-immersed power transformer windings.The axial equivalent thermal conductivity and radial equivalent thermal conductivity of oil-immersed power transformer windings were calculated respectively.In this way,the cake winding with equivalent thermal conductivity can be obtained to simulate the actual winding structure considering the interturn insulation.In order to verify the effectiveness of the proposed method,a simulation model of the temperature rise of the oil-immersed transformer windings was established,and the simulation results on temperature rise and hot spot of equivalent model were compared with the simulation results of actual model considering interturn insulation.The results show that the temperature rise and hot spot location are basically the same,and the equivalent model reduces the mesh profile component by 72%,which verifies the effectiveness of the proposed method.The proposed method is applied to the temperature rise and hot spot analysis of the grid side and valve side windings of the converter transformer,and the winding temperature rise and hot spot distribution of the converter transformer are obtained.
作者
沈楠
刘刚
王晓晗
武卫革
SHEN Nan;LIU Gang;WANG Xiaohan;WU Weige(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense(North China Electric Power University),Baoding 071003,China;State Grid Baoding Electric Power Supply Company,Baoding 071003,China;Hebei Key Laboratory of Electromagnetic&Structural Performance of Power Transmission and Transformation Equipment,Baoding Tianwei Baobian Electric Co.,Ltd,Baoding 071056,China)
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2023年第4期60-68,共9页
Journal of North China Electric Power University：Natural Science Edition
基金
国家重点研发计划项目(2021YFB2401703)
河北省重点研发计划项目(20312101D)。
关键词
油浸式变压器
等效导热系数
最小热阻力法则
热点
oil-immersed transformer
equivalent thermal conductivity
minimum thermal resistance rule
hot spot
