摘要
针对变压器油纸绝缘在电场、温度和机械力等多重外部环境因素下的老化问题,分析电、热、力三种因素对油纸寿命的影响。通过在不同温度(363 K、383 K、403 K)、电场强度(2 kV/mm、2.5 kV/mm、3 kV/mm)和机械应力(1 MPa、1.5 MPa、2 MPa)条件下进行加速老化试验,测定油纸绝缘在不同老化阶段的聚合度(degree of polymerization,DP),获得了DP随时间变化的损失曲线;基于时温叠加法,对温度平移因子进行了改进,进一步引入电场强度和机械应力平移因子,将电场和机械力的作用纳入Arrhenius方程中修正活化能项,构建了考虑电、热、力多因素的油纸绝缘寿命评估模型。研究结果为变压器油纸绝缘在复杂环境下的寿命预测提供了理论支持。
Aiming at the aging of transformer oil-paper insulation under multiple external environmental factors of electric field,temperature,and mechanical force,this work analyzes the effects of the three factors of electro-thermal force on the life of oil paper.By conducting accelerated aging tests at different temperatures(363 K,383 K,403 K),electric field strengths(2 kV/mm,2.5 kV/mm,and 3 kV/mm),and mechanical stresses(1 MPa,1.5 MPa,and 2 MPa),the degree of polymerization(DP)of oil-paper insulations at different aging stages is determined,and the loss curves of the degree of polymerization with the change of time are obtained.Based on the time-temperature superimposed method,the temperature leveling factor is improved,and electric field strength and mechanical stress leveling factors are introduced.The effects of the electric field and mechanical force are incorporated into the activation energy term in the Arrhenius equation,resulting in the life assessment model of oil paper insulation considering multiple factors of electricity,heat,and force.The results provide theoretical support for the life prediction of transformer oil-paper insulation in complex environments.
作者
刘建
孙锐
高俊营
李长云
LIU Jian;SUN Rui;GAO Junying;LI Changyun(State Grid Dezhou Power Supply Company,Dezhou 253072,China;Department of Electrical Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《山东电力技术》
2025年第8期85-93,共9页
Shandong Electric Power
基金
国网山东省电力公司科技项目(520608230001)。
关键词
油纸绝缘
寿命评估
聚合度
时温叠加
oil-paper insulation
life assessment
polymerization
time-temperature superposition
