Heat Resisting Mechanism of Heat-Resisting Aluminum Alloy Conductor and Its Application in Transmission Line

In this paper the heat withstanding mechanism of heat-resisting aluminum alloy conductor is discussed, the types and performance of the conductor and its application on transmission lines are analyzed and introduced, and suggestions on accelerating exploitation and application of the conductor are put forward.

Microstructure and Corrosion Resistance of CrN and CrN/TiN Coated Heat-Resistant Steels in Molten Aluminum Alloy

The components of the equipment for processing the Al melts into the molded parts can be markedly corroded by the molten Al. In this study, a 4 μm CrN coating or CrN/TiN multilayer coating for providing the physical and chemical barriers between the molten reactive Al and the steel substrate were deposited by Cathodic Arc Evaporation onto 10 mm-thick heat-resistant steel plates. The dipping tests were conducted in a 700℃ A356 melt for 1 to 21 h at intervals of 3 h. The damage of the coated steel was eva...

Investigation on Preparation and Anti-icing Performance of Superhydrophobic Surface on Aluminum Conductor

Aluminum is widely used in transmission lines, and the accumulation of ice on aluminum conductor may inflict serious damage such as tower collapse and power failure. In this study, super-hydrophobic surface （SHS） on alurninurn conductor with rnicro-nanostructure was fabricated using the preferential etching principle of crystal defects. The surface rnicrostructure and wettability were investigated by scanning electron microscope and contact angle measurement, respectively. The icing progress was observed with a self-made icing experiment platform at different environment temperature. The results showed that, due to jumping and rolling down of coalesced droplets from SHS of aluminum conductor at low temperature, the formation of icing on SHS could be delayed. Dynamic icing experiment indicated that SHS on aluminum conductor could restrain the formation of icing in certain temperature range, but could not exert influence on the accumulation of icing. This study offers new insight into understanding the anti-icing performance of actual aluminum conductor.

High-temperature oxidation behavior of 9Cr‒5Si‒3Al ferritic heat-resistant steel

To improve the oxidation properties of ferritic heat-resistant steels,an Al-bearing 9Cr‒5Si‒3Al ferritic heat-resistant steel was designed.We then conducted cyclic oxidation tests to investigate the high-temperature oxidation behavior of 9Cr‒5Si and 9Cr‒5Si‒3Al ferritic heat-resistant steels at 900 and 1000℃.The characteristics of the oxide layer were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The results show that the oxidation kinetics curves of the two tested steels follow the parabolic law,with the parabolic rate constant kp of 9Cr‒5Si‒3Al steel being much lower than that of 9Cr‒5Si steel at both 900 and 1000℃.The oxide film on the surface of the 9Cr‒5Si alloy exhibits Cr2MnO4 and Cr2O3 phases in the outer layer after oxidation at 900 and 1000℃.However,at oxidation temperatures of 900 and 1000℃,the oxide film of the 9Cr‒5Si‒3Al alloy consists only of Al2O3 and its oxide layer is thinner than that of the 9Cr‒5Si alloy.These results indicate that the addition of Al to the 9Cr‒5Si steel can improve its high-temperature oxidation resistance,which can be attributed to the formation of a continuous and compact Al2O3 film on the surface of the steel.

E2EM’s prediction of LaB_(6) as nucleation substrate for primary Mn-rich phase in Al-Si-Cu-Mn heat-resistant alloy and its refining effect

Edge-to-edge matching(E2EM)model was used to predict the potency of LaB_(6) as the heterogeneous nucleation substrate for primary Al_(13)Mn_(4)Si_(8) phase formed during the solidification of Al−Si−Cu−Mn heat-resistant alloy.There are five pairs of orientation relationships(ORs)between LaB_(6) and Al_(13)Mn_(4)Si_(8) phases which meet the criteria of E2EM model.One pair of plane ORs((110)LaB_(6)//(110)Al_(13)Mn_(4)Si_(8))are demonstrated by TEM observation.This strongly indicates that the LaB_(6) phase can act as the heterogeneous nucleation substrate for the primary Al_(13)Mn_(4)Si_(8) phase.1.0 wt.%of Al−2La−1B master alloy was also added into Al−12Si−4Cu−2Mn alloy to evaluate the refining effect by microstructure observation and tensile test.Experimental results show that addition of Al−2La−1B master alloy can significantly refine the primary Al_(13)Mn_(4)Si_(8) phase,supporting the prediction accuracy of E2EM model.However,such refinement of primary Al_(13)Mn_(4)Si_(8) phase does not lead to an improvement in strength.This is due to the larger difference in elastic modulus between the finally formed Al_(13)Mn_(4)Si_(8) phase and aluminum matrix than that of Al_(15)Mn_(3)Si_(2) phase.

基于绝对节点坐标法的架空线断线工况动力学计算

为了计算架空线断线工况下的动力学变化特性,考虑架空线的绞制几何结构及其初始构型的布置特点,以绝对节点坐标法为基础,建立了架空线单元,推导了架空线单元的质量矩阵和弹性力矩阵,给出了架空线的系统动力学方程。针对钢芯铝绞线的绞制几何结构,给出了其对应的轴向、弯曲刚度计算公式。通过仿真计算得到线缆的运动图像,设计试验验证了算法模型的可靠性。结合实际架空线初始位形和初始应力特点,对不同初始应力下的架空线断线工况动力学问题进行仿真分析,绘制了悬挂点处的受力时程曲线并对曲线进行了频谱分析,研究了初始应力对断裂架空线运动过程以及悬挂点受力的影响规律。

高性能8xxx系铝合金材料研究进展及其在电力电缆领域的应用

针对电力电缆行业“以铝代铜”的应用发展需求,通过对新型铝合金材料研发、铝芯电力电缆的技术、经济特性及其国内外应用现状与标准化情况的调研分析,阐述了铝芯电力电缆的导体材料及连接金具的性能要求和主要制备工艺方法,对比了国内外主要技术特点,提出了高压铝芯电力电缆研制的可行技术路线。

表面构型对输电导线覆冰碰撞特性的影响分析

导线结冰严重影响着电网运行安全,局部碰撞系数是表征输电导线覆冰增长速率的关键指标,以往对传统钢芯铝绞线或其简化圆柱模型的覆冰增长特性进行了分析,碳纤维复合芯导线(Aluminum Conductor Composite Core,ACCC)作为一种发展迅速的新型导线,其局部碰撞系数和覆冰增长过程鲜有研究。首先基于商用有限元软件Fluent实现了对覆冰增长数值模拟,并通过与模拟试验结果对比,验证了仿真方法的有效性。随后,利用经过验证的数值模拟方法,对ACCC模型和简化的圆导线模型的覆冰增长特性进行了对比研究,模拟得到了二者表面的液滴碰撞系数分布,讨论了不同的雨滴中值直径和风速变化对碰撞系数的影响,获取了ACCC模型的结冰冰形。结果表明:风速低时ACCC模型的局部碰撞系数显著小于圆模型,覆冰初期,冰形受导线表面构型影响十分显著;当导线表面被覆冰完全包裹后,圆模型冰形比ACCC模型冰形阻力系数整体低15.3%,且在多个风攻角下呈现驰骋不稳定性。研究结果对于获取ACCC覆冰增长特性,了解不同表面构型导线覆冰致灾机理具有重要价值。

电力施工包裹导线新型软铝片的设计与开发

输电线路导线在微风作用下会产生振动,振动节点往往位于导线与金具的连接固定处。但输电线路运行中长时间的弯折和受压会使导线产生疲劳。为避免金具和导线的长期接触摩擦,开发设计一种可紧密包裹住导线的新型软铝片,可更好防护导地线受损,缓解故障电流电弧灼伤导线和金具,避免在长期风荷载、疲劳振动等不可抗力因素作用下产生金具滑移、导线断股风险,有效解决作业中铝包带缠绕松散、预绞丝护线条耗时耗力的施工工艺问题。

铝合金电缆在新能源汽车轻量化进程中的作用分析

随着新能源汽车产业的迅速发展,轻量化成为关键的研究方向。文章聚焦于铝合金新能源汽车高压电缆在轻量化进程中的作用,详细阐述铝合金材料的特性使其在高压电缆应用中具有显著优势,能有效减轻电缆质量,从而为整车轻量化做出重要贡献。进一步分析在实际应用中,铝合金电缆面临的技术挑战及解决方案,为新能源汽车高压电缆的轻量化发展提供理论支持和实践指导,助力新能源汽车行业在轻量化道路上取得更大的突破。

工业污染区架空导线腐蚀状态评价及机理研究

通过工业污染区架空线路导线的外观形貌观察、腐蚀坑深度测量、抗拉强度、伸长率、扭转次数及电阻率等理化及电气试验,以及与同型号新导线检测结果的数值比对,探究导线腐蚀对其力学、导电及防腐性能的影响,另外,通过铝线及镀锌钢线的断口分析、腐蚀物成分、镀锌钢线的镀层厚度观测,研究工业污染环境下钢芯铝绞线的腐蚀机理及控制措施,提出了新的镀锌钢线锌层厚度检测评估方法,为架空输电线路腐蚀状态评价及运维检修策略提供技术依据。

新型抗冰雪耐候平行集束架空电缆研制

为解决严苛环境下,尤其是北方冰雪环境下,架空线路面临的抗冰雪性能弱、承载能力不足及机械强度低下等问题,设计了新型抗冰雪耐候平行集束架空电缆。采用高强度平行集束结构和抗冰雪设计,导线横断面设计为类机翼结构,绝缘层与连筋在上表面形成相切的平面或微弧形接触面,并将加热元件嵌入连筋下方,有效减少冰雪在导线表面的附着,显著提高了融冰效率。同时,针对圆形导体的局限性,设计了铝合金异形导体及其加工工艺,结合型线分层微压缩绞合技术,将紧压系数提升至97%以上,外径缩小约5%,成本节省约1.5%,抗拉强度提高30%以上,显著提升了架空线路在复杂条件下的综合性能。研制的产品为复杂地理环境和气候条件下的电力输送提供了高效、经济且耐用的解决方案,对提升架空线路的整体性能具有重要意义。

中国电缆工业的技术现状及其发展趋势

电缆行业作为国民经济的重要支柱,对经济的稳定增长和社会的安全运行至关重要。文中全面综述了中国电缆工业的技术发展,重点讨论了电力电缆、装备电缆、绕组线、通信电缆导体材料和架空输电线领域的技术进步,涵盖绝缘材料的国产化、生产装备的创新,以及电缆产品的多样化发展等;此外,还探讨了高性能碳纤维和铜-石墨烯、铝-碳纳米管合成材料在电缆工业中的应用前景和产业化面临的挑战,为电缆领域的科技工作者提供参考和指导。

架空导线用铝合金的机电性能及现状与发展

对国内常见的架空导线及其机电性能做了比较,提出了一种综合性能指标用于全面评价各种不同导线的机电性能,重点对全铝合金绞线和铝合金芯铝绞线的发展及其优越性进行了评述,最后介绍了导线铝合金提高强度与导电性的国内外最新研究进展。

钢芯铝绞架空导线微动疲劳断口形貌

在自制的微动疲劳试验装置上进行钢芯铝绞导线(ACSR)的微动疲劳试验,采用扫描电子显微镜观察分析内、外层铝股线断口特征,研究其微动疲劳断裂机制。结果表明:铝股线的断股大多发生于导线与线夹的最后接触点处。微动振幅为1.0 mm时,在较低循环周次下(1.6×107),铝股线只发生正断;随着循环次数增加,铝股线断股数量增加,且发生45°及"V"形断裂。铝股线疲劳断口由疲劳源区、疲劳裂纹扩展区、瞬断区构成,呈现弯曲疲劳和扭转疲劳两种不同的断裂方式。

稀土元素对铝导体导电性能的影响

研究了稀土元素对铝导体导电性能的影响。结果表明:不同纯度的工业纯铝,添加稀土元素对其导电性能的影响差别很大。混合稀土对杂质含量较高的纯铝的导电性有改善,对杂质含量低的纯铝的导电性基本不起作用。单独加稀土铈或镧对杂质含量高的纯铝的导电性在一定的添加范围内有一定的改善,而对杂质含量较低的纯铝的导电性略有改善。对同一纯度的铝而言,单一稀土对其导电性的影响优于混合稀土。

铝合金在电力传输领域的研究及应用

主要综述了在电力传输领域中铝与铝合金导体电缆的发展历程、现状以及仍需解决的问题。介绍了铝合金导体电缆的技术性能和应用领域,阐述了铝合金导体电缆相对铜电缆的性能优势和经济效益,并展望了未来我国铝合金导体电缆的发展前景。

Ce对耐热铝导体材料铸态组织和性能的影响

采用电阻率测试、硬度测试、金相显微镜和扫描电镜观察等方法,研究添加不同含量稀土Ce对铸态耐热铝导体材料Al-0.15Zr合金的影响。研究结果表明:Ce能净化基体,与杂质相形成金属间化合物,改变杂质相的形态和分布;添加适量的Ce,显著细化了晶粒和枝晶组织,有利于导电性和强度的提高;随着Ce加入量的增大,晶粒细化效果更好;当Ce含量(质量分数)超过0.3%以后,二次枝晶间距继续减小,但晶粒尺寸细化不明显;当Ce含量为0.3%和0.4%时,Al-0.15Zr合金的导电性和强度均达到最大值。

碳纤维复合芯电缆国内外技术研发现状及工程应用进展

碳纤维复合芯铝绞电缆是一种容量大、损耗低、节能环保的新型复合芯导线。它具有重量轻、强度大、耐高温、耐腐蚀、线损小、弛度低、热膨胀系数小等一系列优异性能。国外技术研发以美国和日本较为成熟,并在工程实际应用。国内的技术研发近3年取得了突破性进展,部分企业已批量生产,产品已在百余条电网中挂网运行。

高电导率耐热铝合金导体材料的合金设计

耐热铝合金导线的耐热机理是采用微合金化元素提高铝基体的再结晶温度。提高耐热铝合金导线电导率的措施是优选微合金元素和工业纯铝,降低微合金元素和杂质元素对铝基体导电性的影响。在分析Zr、Er、Y等微合金元素对铝导体再结晶温度和导电性影响的基础上设计出了Al-Er-Y和Al-Er-Y-B系耐热铝合金导体材料。采用优选Al99.70重熔用铝锭和Al-Er、AlY、Al-B中间合金制备了Al-Er-Y-(B)耐热铝合金导线。结果表明,Al-0.1~0.2Er-0.1~0.2Y-0~0.03B合金导线的抗拉强度≥160 MPa、伸长率(200 mm标距)≥2%、导电率(20℃)≥61%IACS、230℃退火1 h后的强度残存率≥90%。