架空输电线路节能导线应用技术经济分析

介绍了铝合金芯铝绞线、钢芯高导电率硬铝绞线、中强度铝合金绞线3类节能型导线材料特点,结合节能导线试点工程,对节能导线与常规钢芯铝绞线进行了导线技术特性、经济性、施工等方面的综合分析比较,提出了3类新型节能导线在输电线路工程中的适用范围。研究表明,3类新型节能导线完全可以替换钢芯铝绞线在输电线路中应用,且具有良好的节能效果。     

碳纤维复合芯梯形软铝导线的研究开发

结合中国电力科学研究院碳纤维梯形软铝导线的研制、试验情况,介绍了该导线的生产流程,重点对碳纤维复合芯的研制、梯形软铝单丝拉制和导线绞制的关键工艺进行阐述。 通过该导线的性能试验分析,说明其具有自阻尼特性好、低弧垂、导电率高、载流量大、抗冰雪能力强的优点。 随着国产碳纤维技术日趋成熟,碳纤维梯形软铝导线具有很好应用前景。     

架空输电线路钢芯软铝绞线的应用研究

钢芯软铝绞线是一种架空输电线路用的特种导线。它具有导电率高、热稳定性好、弛度低、自阻尼特性好等优点。具有推广应用的价值和前景。文章对这种导线的结构、特性和应用情况等作了介绍和分析研究,并对其今后的发展作了评估。     

型线同心绞架空导线的结构设计

型线同心绞架空导线与圆线同心绞架空导线相比,具有更大的导体截面利用率,在相同截面积条件下,具有直径小、风载低、耐腐蚀、自阻尼性优等众多优点,在架空输电线路上的应用将越来越广泛。该文主要对该产品的结构设计作一探讨。     

Guidelines for the selection and operation of bare ACSR conductors with regard to current-carrying capacity

Factors affecting the thermal ratings of bare overhead power conductors (in particular, ACSR conductors) are reviewed. Equations for calculating the current-carrying capacity (ampacity), loss of strength, and time-temperature characteristics of ACSR conductors are illustrated and parameters used in these equations are explained. Results have been obtained for ampacity, loss of strength and conductor temperature for a typical ACSR conductor (‘Drake’) in terms of various parameters such as ambient temperature, wind velocity, and (solar) insolation by means of Fortran programs written by the authors. These results are presented in graphical form. From them, meaningful conclusions are drawn regarding the means of evaluating permissible loading levels of transmission and distribution lines, especially lines of short to moderate length.The paper has been written primarily from the standpoint of showing how information currently available to utility industry personnel can be applied to evaluate the impact of various parameters on the permissible loading levels of bare conductors. The examples presented are typical of those of interest to the Tucson Electric Power Company and other utilities.     

1000mm2大截面导线用防振锤设计

1660 kV宁东-山东直流输电示范工程一般线路使用1 000 mm2大截面钢芯铝绞线(型号JL/G3A-1000/45),需要采用加装防振锤来抑制此段线路微风振动.通过防振锤的保护频率的公式计算及导线自阻尼试验,最终确定JL/G3A-1000/45型导线需要用防振锤防护的频率为5-50 Hz.经过计算分析设计出合理的...     

碳纤维复合芯导线的施工工艺

碳纤维复合芯导线是一种节能型增容导线,具有节能降耗、重量轻等优点。碳纤维复合芯导线由于其自身结构特点,在施工过程中容易出现导线碳纤维复合芯棒内缩、导线铝股松弛、外层铝股损伤等现象。在220 kV 洛燕线路和洛振线路由常规钢芯铝绞线更换为碳纤维复合芯导线改造工程中,研制了专用卡线器,并采取了科学、合理的碳纤维复合芯导线的施工工艺,避免了上述不良现象发生,保证了工程质量及施工安全。     

几种边界条件对节能导线年费用的影响分析

与等外径的普通钢芯铝绞线相比,节能导线直流电阻较小,在不降低机械性能的前提下,可减少输电线路损耗,达到节能效果。结合某典型500kV交流双回路线路工程,以普通钢芯铝绞线为基准对比分析了3种等外径的节能导线方案（钢芯高导电率铝绞线、铝合金芯铝绞线、中强度铝合金绞线）的电能损耗、本体投资,通过分别对比几种不同边界条件（输送容量、电价、导线市价）下的各导线方案的年费用,提出了3种节能导线在各边界条件下的适用范围,为工程中节能导线的选型和推广应用提供了参考。     

碳纤维复合芯导线及金具压接施工技术研究

碳纤维复合芯导线（简称ACCC）是目前全世界电力输变电系统理想的取代传统的钢芯铝铰导线、铝包钢导线、铝合金导线及进口殷刚导线（简称ACSR）的新产品,碳纤维复合芯导线与传统导线相比具有重量轻、强度大、低线损、弛度小、耐高温、耐腐蚀、与环境亲和等优点,是实现电力传输节能、环保与安全的理想替代品。文章介绍了碳纤维复合芯导线的性能特点和施工方法,为今后实施类似工程提供参考。     

方形导线加工工艺的探讨

低温超导电缆、核电站用磁铁线圈的绕组线、电子辐照加速器等产品中的核心部件绕组线圈所用的导线,考虑到槽满率和各种损耗因素的影响,不少设计部门已采用方形导线取代普通圆形导线。本文主要论述如何选用合理的加工工艺,以便生产出满足要求的各种类型的方形导线。     

钢芯铝型线绞线与钢芯铝绞线的主要性能对比

提出了导线截面利用率的概念,基于S、Z铝型线导体,给出了几种与常用规格圆线同心绞钢芯铝绞线对应的型线同心绞钢芯铝型绞线,将两者的部分基本参数和特性作了对比。结果表明:型线同心绞的钢芯铝型线绞线比圆线同心绞钢芯铝绞线的导体截面利用率约高15%,若截面积相等,钢芯铝型线绞线的直径约减小9%,其他性能几乎相同;若两者直径相等,则钢芯铝型线绞线的导体截面积、单位质量和抗拉力较大,同时直流电阻减小而载流量增大。钢芯铝型线绞线的安装可采用常规金具,具有一定的缓覆冰性能和较好的弧垂特性,将是输电线路使用中的一种重要线种。     

带张力更换导线的施工方法应用探讨

以一条220 kV线路增容改造施工为例,介绍了一种将多个耐张段的普通钢锌铝绞线在耐张塔上用特定长度的钢丝绳套连接成一个大耐张段,利用张力机带张力回牵旧导线,再牵引耐热铝合金导线进行换线的施工方法,有效解决了现场施工场地狭小、线路下方交跨复杂、经济作物多、政策处理难等施工难点,取得了良好的经济效益和社会效益,可为同类导地线更换改造施工提供参考。     

Investigation of mechanical properties of single layer ACSR based on an Integrated Model

The design, selection and improvement for overhead aluminum conductor steel reinforced (ACSR) require intensive understanding of the cable characteristics. Until now, the analytical model for single layer ACSR is not satisfactory because of an unacceptable error between the analytical value and the experimental value. This paper presents a newly developed Integrated Model designed and performed on single layer conductors to investigate their electromagnetic, thermal and mechanical properties based on the Unified Model which was initially designed for three-layer ACSR. Carefully designed physical experiments to obtain conductor electromagnetic properties were used to validate the Integrated Model for various composite single layer ACSR: Guinea, Penguin, and Raven, popularly used in North America. An analysis of the electrical losses is also reported, and mechanical properties of odd-layer ACSR conductors are studied through case examples.     

Performance requirements for vibration dampers

An analysis method introduced in a recent paper has been applied to four ACSR conductors. Calculations are carried out to further illustrate the method, showing the relationship between wind energy input to the conductor and energy loss from the conductor when it is vibrating at a constant loop velocity equal to 200 mm/s. The difference between the two energy curves defines an energy gap or shortfall that must be supplied by vibration dampers. This energy gap is seen to depend strongly on the conductor tension, the conductor diameter, and the conductor span length. An illustration is given showing how well a Stockbridge damper or an impact damper fills the energy gap. One additional illustration is given applying the same principles to a triple-conductor bundle and an impact type of damping spacer. Finally, field tests conducted earlier on the four sample conductors are compared with the calculated results.     

Aged ACSR conductors. I. Testing procedures for conductors and lineitems

Field and laboratory tests of ACSR conductors and related line items from many of Ontario Hydro's older transmission lines are described. A nondestructive corrosion detector was modified for live line measurement of the loss of galvanizing from the steel cores of the ACSR conductors. Samples of conductors tested in the field have also undergone laboratory metallurgical investigation, and tests of fatigue, tensile strength, torsional ductility, and electrical performance. Extensive environmental studies identified corrosion products of ACSR conductors, the atmospheric factors responsible for corrosion, and the mechanisms by which corrosion takes place. It is concluded that the corrosion detector serves as a useful indicator of impeding end of conductor life, while the torsional ductility tests serve as a more precise condition indicator and can provide a guide for scheduling conductor replacement     

输电线路新型节能导线的推广应用

结合国家电网公司基建新技术的推广应用,介绍了高导电率钢芯铝绞线、铝合金芯铝绞线和中强度全铝合金绞线的节能原理和性能,对比分析了3种新型节能导线在电气、机械特性等方面的技术差异,并对影响线路造价的敏感因素进行了分析,采用年费用和投资回收期法对导线的经济性进行了评价,最后提出了3种新型节能导线的工程应用范围,为节能导线的推广应用提供了参考。     

三峡工程500kV大容量输电线路用导线之二 主干线路大截面ACSR/AS-720/50的研制

三峡工程± 5 0 0 k V直流输电线路用大截面导线 ,目前虽然可以采用钢芯铝绞线 ,但铝包钢芯铝绞线更具有优良的性能。本文叙述制造 ACSR/ AS- 72 0 / 5 0铝包钢芯铝绞线的主要技术关键 ;原材料铝线和铝包钢线、ACSR/ AS- 72 0 / 5 0的性能 ;及其试验的结果和结论。     

High Frequency Loss From Neutral Wire-Shield Interaction of Shielded Power Cable

The conductor and ground shield layers of shielded distribution cable provide a smooth interface between conductors and insulation. Their semiconducting nature causes attenuation of high frequencies which propagate down the cable, as the high frequency displacement current flows through the shield layers and, in the case of concentric neutral cable, in a circumferential direction through the ground shield to a neutral wire. Such attenuation is relevant to partial discharge detection and the use of shielded power cable for wideband communications. This paper discusses the high frequency attenuation in concentric neutral shielded power cable and develops an analytic approximation for predicting high frequency attenuation which is compared with finite element computations and experimental data.     

750kV输电用扩径型钢芯铝绞线关键技术探讨

我国将首次在西北电网750 kV输电工程上采用LGJK-300/50扩径型钢芯铝绞线。文中根据该导线《技术条件》提出的特殊要求,论述制造厂应如何解决扩径导线制造中面临的新问题。