热循环对电气接续材料长期连接性能的影响
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摘要
电气线路的压接连接质量会对线路的长期运行安全产生较大的影响。采用热循环及短路试验对铝制接续金具和铝合金接续金具压接下的铝合金电缆导体线路的运行情况进行了分析。结果表明:在热循环试验条件下,铝制接续金具与铝合金接续金具的压接性能差异不大,但短路试验后,铝合金接续金具的压接性能明显优于铝制金具的;短路试验所产生的温差导致的接续金具内部应力(110 MPa)明显高于热循环试验所产生的应力(35 MPa);Al-0.6Fe-0.15Cu铝合金接续金具,基体中Al_3Fe相粒子可极大地阻碍位错的运动,增加蠕变变形抗力,提高材料应对热循环特别是短路时所产生的高温大应力下蠕变变形的能力。
The quality of compressive connection of electrical circuit has a great influence on the long running safety of the line. The connection of aluminum alloy cable conductor with aluminum and aluminum alloy connection hardware was analyzed by thermal cycling and short circuit test. The results show that there is little difference in the compression performance between aluminum and aluminum alloy connection hardware under the condition of thermal cycling test.However, after the short circuit test, the compression performance of aluminum alloy is better than that of aluminum. The internal stress(110 MPa) caused by temperature difference in short circuit test is significantly higher than the stress generated by the thermal cycling test(35 MPa), the short circuit test is more stringent in the examination of material performance. The Al_3Fe phase particles in the matrix of Al-0.6 Fe-0.15 Cu alloy can greatly hinder the dislocation movement, and increase creep deformation resistance. The ability to deal with creep deformation of Al-0.6 Fe-0.15 Cu alloy under high temperature and big stress caused by thermal cycling and especially short circuit is improved.
The quality of compressive connection of electrical circuit has a great influence on the long running safety of the line. The connection of aluminum alloy cable conductor with aluminum and aluminum alloy connection hardware was analyzed by thermal cycling and short circuit test. The results show that there is little difference in the compression performance between aluminum and aluminum alloy connection hardware under the condition of thermal cycling test.However, after the short circuit test, the compression performance of aluminum alloy is better than that of aluminum. The internal stress(110 MPa) caused by temperature difference in short circuit test is significantly higher than the stress generated by the thermal cycling test(35 MPa), the short circuit test is more stringent in the examination of material performance. The Al_3Fe phase particles in the matrix of Al-0.6 Fe-0.15 Cu alloy can greatly hinder the dislocation movement, and increase creep deformation resistance. The ability to deal with creep deformation of Al-0.6 Fe-0.15 Cu alloy under high temperature and big stress caused by thermal cycling and especially short circuit is improved.
引文
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[2]汪国明.低压铝合金电缆替代铜缆在建筑中的应用[J].建筑工程技术与设计,2015(1):564.WANG Guo-ming.The application of low voltage aluminum cable to copper cable in construction[J].Architectural Engineering Technology and Design,2015(1):564.
[3]杜毅威.铝合金电缆在建筑工程中的应用[J].建筑电气,2010,29(5):42-45.DU Yi-wei.Application of aluminum alloy cables in construction engineering[J].Building Electricity,2010,29(5):42-45.
[4]陈雪姣,魏瑞启,王裕,蔡彬.Yb、Er对8030导电铝合金力学和导电性能的影响[J].特种铸造机有色合金,2017,37(9):1030-1033.CHEN Xue-jiao,WEI Rui-qi,WANG Yu,CAI Bin.Effects of Yb and Er on the mechanical and electrical properties of8030 conductive alloys[J].Special Casting&Nonferrous Alloys,2017,37(9):1030-1033.
[5]谭敦强,黎文献,唐宜平.Al-Fe系合金中的相及相转变[J].材料导报,2003,17(5):18-20.TAN Dun-qiang,LI Wen-xian,TANG Yi-ping.Phase and phase transformation in Al-Fe system alloy[J].Materials Review,2003,17(5):18-20.
[6]於国良,吴振江.电工用8030铝合金杆的制造工艺与性能控制[J].电线电缆,2017(2):12-16.YU Guo-liang,WU Zhen-jiang.Manufacturing technologies and quality controls of 8030 aluminum alloy rod[J].Wire&Cable,2017(2):12-16.
[7]张国玲.合金元素含量与加工工艺对8030铝合金导线性能的影响[D].郑州:郑州大学,2012:19-55.ZHANG Guo-ling.The Effects of alloying elements content and processing technology on properties of 8030 aluminum alloy[D].Zhengzhou:Zhengzhou University,2012:19-55.
[8]ZHANG Xiao-yuan,ZHANG Hui,KONG Xiang-xin.Microstructure and properties of Al-0.70Fe-0.24Cu alloy conductor prepared by horizontal continuous casting and subsequent continuous extrusion forming[J].Transactions of Nonferrous Metals Society of China,2015,25(6):1763-1769.
[9]KIM M G,LEE G C,PARK J P.Continuous casting and rolling for aluminum alloy wire and rod[J].Materials Science Forum,2010,638/642:255-260.
[10]XING Z P,KANG S B,KIM H W.Microstructural evolution and mechanical properties of the AA8011 alloy during the accumulative roll-bonding process[J].Metallurgical and Materials Transactions A,2002,33(5):1521-1530.
[11]杨荣凯,陈冠,张冰,孔维权,刘志鹏.电缆用Al-Fe合金抗压蠕变及力学性能的工艺研究[J].铸造,2017,66(10):1062-1066.YANG Rong-kai,CHEN Guan,ZHANG Bing,KONGWei-quan,LIU Zhi-peng.Process research on compressive creep and mechanical properties of Al-Fe alloy for cable industry[J].Foundry,2017,66(10):1062-1066.
[12]郭磊,易丹青,臧冰,王斌,刘会群,柳公器.挤压比对AA8030铝合金棒材组织及电性能的影响[J].中国有色金属学报,2013,23(8):2083-2090.GUO Lei,YI Dan-qing,ZANG Bing,WANG Bin,LIUHui-qun,LIU Gong-qi.Effect of extrusion ratio on microstructure and electrical properties of AA8030aluminum alloy rod[J].The Chinese Journal of Nonferrous Metals,2013,23(8):2083-2090.
[13]王祝堂,田荣璋.铝合金及其加工手册[M].3版.长沙:中南大学出版社,2007:217-520.WANG Zhu-tang,TIAN Rong-zhang.Aluminum alloy and its processing manual[M].3rd ed.Changsha:Central South University Press,2007:217-520.
[14]LI Y J,ARNBERG L.Solidification structure of DC-cast AA3003 alloy and its influence on homogenization[J].Aluminium,2002,78(10):834-839.
[15]LI Y J,ARNBERG L.Precipitation of dispersoids in DC-cast3003 alloy[J].Materials Science Forum,2002,396/402(2):875-880.
[16]NISHIMOTO A,AKAMATSU K.Preparation of homogeneous Fe-A1 intermetallic compound sheet by multi-layered roiling and subsequent heat treatment[J].Materials Science Forum,2007,561/565(2):857-860.