摘要
目的通过分析特高压直流线路工频磁场环境对电力金具材料磨损行为的影响,探究其磨损机理,为联接金具的磨损失效预测提供理论依据。方法分析线路实际运行参数,计算工频磁场强度,采用自制电磁线圈与M-2000型磨损试验机相结合,通过分组控制变量法研究额定工况下金具材料的磨损过程,以及不同磁场强度下材料的磨损行为。结果在磁场环境中材料的磨损程度远小于无磁场情况下。在0~800 A/m范围内,随着磁场强度的增加,摩擦因数稍降低,质量损失量和磨损率呈下降趋势。在不同磁场强度下磨损试样均呈现越贴近摩擦接触表面区域其显微硬度越高,且随着纵深向后呈递减趋势。在无磁场情况下,磨损接触表面的犁沟较深,遍布锯齿型边缘的凹坑和山脊型微凸峰。在磁场环境中试样的接触表面和磨屑表面更加光滑平整,且氧含量明显升高。结论在无磁场情况下,接触表面为严重的磨粒磨损和黏着磨损。在磁场环境中,磨损试样在短时间内经历了初期磨合阶段和磨损加剧阶段,从而加速过渡到稳定磨损阶段,由严重的磨粒磨损和黏着磨损加速向轻微磨损转变。稳定阶段的主要磨损机制为氧化磨损,并伴随着轻微的磨粒磨损、黏着磨损,以及两摩擦副与磨屑“阻隔层”之间的三体磨损。工频磁场环境对试样磨损起到了一定的减摩作用,磨损程度减轻。
By analyzing the influence of the power-frequency magnetic field environment of UHVDC transmission lines on the wear behavior of the electric power fittings materials,the wear mechanism of the electric power fittings materials in the power-frequency magnetic field environment was explored to provide a theoretical basis for the wear failure prediction of the connected hardware in service.According to the actual operating parameters of UHVDC transmission lines,the power frequency magnetic induction intensity was analyzed and calculated.The self-made electromagnetic coil connected with external voltage and current stabilized power supply was combined with an M-2000 friction and wear testing machine.The magnetic field intensity generated by the coil was measured with a Gaussian meter,and the sample wear test was designed by using the group control variable method.Before the test,a hand-held degaussing device was used to degauss the pin-ring sample and the rotating shaft of the wear machine.Group A:In the range of 0-800 A/m magnetic field intensity,five gradients of 0,240,400,640 and 800 A/m were selected for wear tests to study the wear behavior of goldware materials in different magnetic induction environments.Group B:The power frequency magnetic field intensity of the transmission line under rated working conditions was selected to study the wear process variation of the goldware material in a specific magnetic induction environment.An electronic balance was used to weigh the sample mass before and after the test and calculate the wear rate.A micro-Vickers hardness tester was used to measure the hardness value of the specimen before and after the test.An industrial microscope was used to observe the macro morphology of the wear contact surface of the sample.A FEG scanning electron microscope(SEM)and an energy dispersive spectrometer(EDS)were used to observe the microstructure of the specimen wear contact surface and wear debris,and to analyze the distribution and content of elements.The results showed that the inte
作者
商利
李新梅
路国闯
陈霸
杨现臣
SHANG Li;LI Xinmei;LU Guochuang;CHEN Ba;YANG Xianchen(School of Mechanical Engineering,Xinjiang University,Urumichi 830017,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第3期132-141,209,共11页
Surface Technology
基金
国家自然科学基金(52161017,51865505)
新疆维吾尔自治区自然科学基金(2022D01C386)。
关键词
特高压输电线路
磁场
U型环
摩擦磨损
UHV transmission lines
magnetic field
U-ring
friction and wear
