基于变压器套管电容芯子温度与介质损耗因数非线性关系的一种迭代算法  

An Iterative Algorithm Based on the Nonlinear Relationship between Temperature of Capacitor Core and Dielectric Loss Factor in Transformer Bushings

作　　者：张璧辉 杨知非 阮江军[1] 夏军 杨帮华[2] ZHANG Bi-hui;YANG Zhi-fei;RUAN Jiang-jun;XIA Jun;YANG Bang-hua(School of Electrical Engineering,Wuhan University,Wuhan 430072,China;State Grid Huangshi Electric Power Supply Company,Huangshi 435000,China)

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国网黄石供电公司,黄石435000

出　　处：《科学技术与工程》2018年第31期172-178,共7页Science Technology and Engineering

摘　　要：高压套管作为变压器重要的附件,研究套管的温度分布是保证其安全可靠运行的关键。以220 k V油纸电容式变压器套管为研究对象,基于电容芯子温度与介质损耗因数(tanδ)的非线性关系提出了一种温度的迭代算法。首先固定tanδ,计算电容芯子的介质损耗;再与其他热源加载到温度场分析中,得到套管初始的温度分布,根据公式对不同温度对应单元的tanδ修正,重新计算介质损耗,再求解温度场,直至相邻计算步之间对应节点温度的相对误差小于0. 01。结果表明在不同环境温度下,采用迭代算法与直接计算的结果进行对比,电容芯子上的最大温差都非常小;在进行套管温度计算时,不必考虑温度与tanδ的非线性关系。研究对于电容式套管温度场的精确计算和tanδ非线性变化的问题具有一定指导意义。As an important accessory of transformer,the study of bushing temperature distribution is the key to ensure its safe and reliable operation.220 kV oil-paper capacitor bushing as the research object was taken,based on the nonlinear relationship between the temperature of the capacitor core and dielectric loss factor(tanδ),a iterative algorithm of the temperature is proposed.First,the tanδis fixed to calculate the dielectric loss,with which the other heat sources are loaded into the temperature field analysis to obtain the initial temperature distribution of the bushing.According to the formula,the tanδis corrected of the corresponding temperature unit to recalculate the dielectric loss.The heat is generated and the temperature field is solved until the relative error of the corresponding node temperature between adjacent calculation steps is less than 0.01.The results show that under different ambient temperatures,comparing with the temperature directly calculated,the maximum temperature difference on the capacitor core is very small,which indicating that it is not necessary to consider the nonlinear relationship between temperature and tanδ.The results are useful for the accurate calculation of the temperature field of the capacitor bushing and the nonlinear variation of the tanδ.

关 键 词：介质损耗因数(tanδ) 非线性变化 油纸电容式套管 温度 迭代计算 

分 类 号：TM854[电气工程—高电压与绝缘技术]