电测与仪表2025，Vol.62Issue(3)：78-84,7.DOI:10.19753/j.issn1001-1390.2025.03.010
基于修正热路模型的油浸式变压器绕组热点温度计算研究
Research of hot spot temperature calculation in oil-immersed transformer based on modified thermal model
摘要
Abstract
The hottest spot temperature(HST)of windings of oil-immersed transformer is an important factor that affects load capacity and operation life of transformer,and is closely related to the transformer load,top oil and en-vironment temperature.Higher hot spot temperature,when operating at high temperature and overload,may lead to transformer failure,which will affect the normal operation of the power system.In order to accurately calculate the hot spot temperature of transformer winding,we construct the dynamic thermal model of transformer based on the theory of heat transfer and thermal-electrical analogy,and then,built a set of differential equations.By taking the effect of heat transfer coefficient of heat sink is different from inside to outside into consideration,we get the effective cooling area of transformer,and fix the thermal circuit model.Taking a 180 MVA-220 kV transformer of Tianwei transformer factory in Hefei as an example,we establish the thermal circuit model to calculate the hot spot tempera-ture.Meanwhile,we establish a three-dimensional model,and get its internal temperature distribution based on Flu-ent simulation software.Finally,we carry out a temperature rise test on the main transformer of this main transformer winding,and the hot spot temperature data of winding is obtained.Combined with online monitored values,we com-pare and analyze the accuracy of thermal model and the model calculation results recommended by IEEE guidelines.The results show that the thermal circuit model with higher accuracy relative to the IEEE guidelines model,which proves that the fixed model can accurately calculate the hot spot temperature of oil-immersed transformer.关键词
油浸式变压器/顶层油温/热点温度/热模型/散热系数Key words
oil-immersed transformer/top oil temperature/hot spot temperature/thermal model/heat transfer co-efficient分类
信息技术与安全科学引用本文复制引用
张晓华,吕志瑞,孙云生,黄彬,王永强..基于修正热路模型的油浸式变压器绕组热点温度计算研究[J].电测与仪表,2025,62(3):78-84,7.基金项目
国家重点研发计划项目(2018YFB0904505) （2018YFB0904505）
国网冀北电力有限公司科技项目(52010119006S) （52010119006S）
