高电压技术2025，Vol.51Issue(1)：62-74,中插4-中插5,15.DOI:10.13336/j.1003-6520.hve.20240825
基于多孔介质的油浸式变压器磁场-流场-温度场仿真计算及热点温度反演预测
Simulation Calculation of Magnetic-Fluid-Thermal Field of Oil-immersed Transformer Based on Porous Media and Prediction of Hot Spot Temperature Inversion
摘要
Abstract
The hot spot temperature of oil-immersed transformer winding is an important factor affecting the aging of material insulation.Based on the electrical and structural parameters of the oil-immersed transformer,a 3D equivalent simulation model of the transformer was established,and the loss values of each wall of the oil tank are accurately ob-tained by calculating the magnetic field.Moreover,the traditional equivalent model and porous medium equivalent model were used to calculate the flow field-temperature distribution of the two equivalent models,and the simulation results of the transformer temperature field were obtained.The temperature distribution of the core and winding of the oil-immersed transformer and the flow velocity around the transformer were obtained.Furthermore,in order to reduce the loss caused by leakage flux on the tank wall and reduce the overall temperature rise of the transformer,electric and magnetic shield-ing plates were applied to the tank wall,respectively,and the influence of the two types of shielding on the tank wall loss value was calculated.According to the calculation results,the shielding effect of magnetic shielding was better,and the shielding position was further studied.According to the calculation results of the temperature field,the characteristic points in the middle of the tank wall and the bottom oil temperature,which have strong correlation with the winding tem-perature,are determined.The results show that the selection of the bottom oil temperature feature points is not only small in number,but also easy to achieve in large transformers,and the correlation coefficient of predicting the winding hot spot temperature is more than 0.95,and the prediction accuracy is higher.This study provides a theoretical basis and technical support for real-time monitoring of hot spot temperature in oil-immersed transformer windings.关键词
油浸式变压器/多孔介质/磁屏蔽/热点温度/BP神经网络Key words
oil immersed transformer/porous media/magnetic shielding/hot spot temperature/BP neural network引用本文复制引用
袁发庭,张乃月,匡柏源,张仁杰,江宇晴,唐波..基于多孔介质的油浸式变压器磁场-流场-温度场仿真计算及热点温度反演预测[J].高电压技术,2025,51(1):62-74,中插4-中插5,15.基金项目
国家自然科学基金(52307179) （52307179）
强电磁技术全国重点实验室开放课题(AET 2024KF011). Project supported by National Natural Science Foundation of China(52307179),Open Program of State Key Laboratory of Advanced Electromagnetic Tech-nology(AET 2024KF011). （AET 2024KF011）
