OPLC电缆成缆外径的计算

详细介绍了光纤复合低压电缆(OPLC)的功能及电缆结构,通过对电缆结构的分析建立了OPLC电缆成缆外径的数学计算模型,并结合MathCAD数学计算软件,对3+1+1芯结构OPLC电缆的成缆外径进行了精确计算。     

OPLC成缆质量的控制

光纤复合低压电缆(OPLC)作为智能电网建设中的重要线缆产品之一,是目前性价比最高的"多网融合"智能电缆产品。由于OPLC结构中包含了绝缘线芯和光单元,因此其成缆质量的控制与普通低压电缆成缆有许多不同。从填充材料的选用、成缆模具的选用、线芯张力的控制、绕包的松紧及收线盘的选择等几个方面对OPLC成缆质量(包括外观圆整度和光单元传输性能等)控制的影响进行了详细的阐述。     

辐照交联LSZH阻燃电缆双层共挤绝缘热收缩改进

双层共挤绝缘辐照交联无卤低烟(LSZH)阻燃低压电缆具有较好的综合性能。针对该类电缆小规格(25 mm2和35 mm2)产品绝缘热收缩指标超标问题,在绝缘挤出交联工艺方面增设导体预热工艺和绝缘线芯高温干燥处理工艺,以释放绝缘挤出时的内应力,但绝缘热收缩改善效果极其有限;在电缆结构方面改进了导体结构(即采用细线径多芯数紧压绞合结构),以确保导体表面更光滑圆整,减小绝缘嵌入导体的程度,提高内、外绝缘交联度均匀性,减小绝缘内应力,最终使绝缘热收缩获得明显改善,满足标准要求。     

铁路信号电缆绝缘线芯分组识别印字标志设计

0 引 言 铁路信号电缆缆芯中绝缘单线的数量为4～61根,绝缘单线的颜色为红、绿、白、蓝四种,缆芯由四线组、对绞组和单线组成,缆芯规格从4芯～61芯共计有20种.四线组由红、绿、白、蓝四色绝缘单线星绞而成;对绞组由红、绿、白、蓝四色绝缘单线两两绞合而成;单线由红、绿、白、蓝四色绝缘单线单独构成.铁路信号电缆缆芯图谱按标...     

330 kV三芯大截面铜芯交流海底电缆的研制

全球节能减排大环境加速了全球海上风电市场的发展,为此展开了作为大容量海上风场输出缆的330 kV三芯大截面铜芯交流海底电缆(海缆)的研制。通过对大长度高压海缆设计、材料开发、设备制造、工艺控制、产品检验能力的一系列创新,成功研制了超大直径(300 mm)的1600 mm2规格330 kV三芯海缆。经检测,该海缆具有优异的机械性能、电气性能、导体阻水性能、防腐蚀性能等,可敷设于100 m水深内海床及登陆段。该海缆可适应国内外市场,并且符合节能降本的主旨。     

用VBA对Excel中电缆工艺结构计算的扩展

详细介绍了采用Excel电子表格通过VBA语言结合Access数据库及电缆工艺结构计算模型快速编制工艺及技术文件的方法,并着重介绍了圆形不等芯电缆成缆外径的计算方法.     

450/750 V多芯控制电缆澳标与国标对比解读

为了使我国电缆企业进入国外控制电缆市场,对450/750 V多芯控制电缆澳大利亚/新西兰标准AS/NZS 5000.3:2003(2017R)和我国国家标准GB/T 9330—2020之间的规定差异进行了对比解读。两个标准不仅对电缆导体、绝缘线芯、成缆、屏蔽、内衬层(隔离套)、铠装和外护套方面规定各有不同,而且对电缆检测、电缆使用特性方面也进行了不同规定。各电缆企业应针对国内外450/750 V多芯控制电缆产品执行的技术标准差异,设计和生产出符合国外市场需求的优质电缆产品。     

基于湿式设计的低压海底电缆研制

湿式设计采用聚合物护层结构径向阻水层代替传统干式设计的金属套类护层结构径向阻水层,使海底电缆产品结构更简单、制造和敷设成本更低、性价比更高。首次尝试湿式设计了900 m短长度、3×35 mm²小规格、0.9 mm薄绝缘220 V低压海底电缆。该基于湿式设计的低压海底电缆通过设置高密度聚乙烯(HDPE)绝缘挡水层和HDPE缆芯挡水层(内衬层)结构实现了径向阻水,电缆满足相关设计要求。该低压海底电缆的设计、制造、敷设和成功运行表明湿式设计可以运用于工作电压等级较低的海底电缆研制。     

全塑石油膏填充电缆的结构与使用

普通塑料通信电缆由于存在透潮问题,其发展速度和使用范围受到了限制。因此,解决塑料电缆的透潮问题,成了研究的中心课题。 1963年英国人G·A多德提出了全填充电缆的理论,即在缆芯及包带层的空隙处采用亲水或增水的物质充分填满(例如石油膏混合物,粉末或纤维素等),形成纵向密封堵水层,保证即便是电缆外护层受到损伤,水也无法进入缆芯。因此,只要绝缘芯线未受损坏,就仍能维     

测护套偏心率用的超声测试装置及控制系统

课题的由来大多数多对通信电缆至少有一层聚乙烯护套,有时要用好几层,长期以来西电公司一直在考虑搞一套恰当的加工工艺,以便使护套结构均匀。挤护套时,缆芯是穿过挤出机包上聚乙烯护套的。我们希望电缆护套均匀,也就是圆周方向厚度变化不大,电缆全长上也无多大变化     

Fiber cable design and characterization

Optical-fiber cable design differs from the design of metallic cables principally because of two factors: i) the physical properties of fibers are more limiting than those of metals, and ii) the transmission performance of a fiber can be altered by cabling operations due to a phenomenon called microbending. After reviewing these factors, methods are considered for mitigating their effects by appropriate design procedures. This leads to the consideration of different types of cable structures. In order to evaluate an optical cable design, it is necessary that its important mechanical and optical properties be characterized. The tensile, bending, and impact performance, as well as cabling added loss, temperature dependence of loss, and concatenated fiber bandwidth are then considered. The paper concludes with a discussion of "long-term" stability of optical cables.     

Effect of cabling on polarization mode dispersion in optical fiber ribbon cables

This paper theoretically and experimentally investigates an effect of cabling on polarization mode dispersion (PMD) in ribbon fibers helically stranded in optical fiber ribbon cables aimed at designing low PMD ribbon cables. Based on the birefringence model focused on the change in the birefringence when ribbon fibers are cabled, the helical pitch of optical fiber ribbon cables is designed to minimize the maximum PMD in the cables. A low PMD characteristic is confirmed in optical fiber ribbon cable with approximately the optimal helical pitch.     

The Submarine Optical Cable of the Submarcom S 280 System

Submarine optical telecommunication cables must satisfy a large number of specific items. To comply with specifications, CDL has developed a cable structure based on high-performance optical fibers placed with slack in the grooves of a plastic rod put in the center of a very strong cable. The deep-sea cable is the basic structure for armored cables or land cables. Armor transitions are designed to minimize cable twist. The couplings are designed to give a good optical electrical and mechanical continuity between the cable and the repeaters. The deep-sea repair is designed to be achievable on a cable ship. The cables, repairs, and couplings have successfully sustained several sea trials and two experimental links are now operating. No increase of the attenuation of the optical fibers in the cable have been noticed on the 19-month old first link. The development of the S 280 cable is proceeding on the right track.     

Structured cabling comes of age

Structured cabling has emerged as a basic building utility, comparable to heating and air conditioning, electricity or plumbing. it forms the essential communications infrastructure of a business's IT system, and is every bit as important as the equipment connected to each end of a piece of cable. Cabling is often overlooked or taken for granted, but a little time and effort in the choice of cabling system will save time, money and frustration in the near term, and, in the longer term, minimise the need for disruptive upgrades. A key objective for any structured cabling system is the capacity to handle with speed and reliability the huge data streams encountered in modern Internet and e-commerce applications. The system should also be capable of fast installation and deployment, which means that cabling components need to be modular, simple to use and, ideally, supplied in pre-qualified form. The author reviews the role of structured cabling in enabling the office IT infrastructure-today and into the future     

Studies on designing of submarine optical fiber cable

This paper describes important studies necessary to design submarine optical fiber cables. These include a study for deciding the optimum single-mode fiber parameters to suppress losses during cabling, cable laying, and so on. It also includes a study on the necessary fiber proof test conditions to prevent fiber breakage during cable handling, that is, during cable laying and recovery and to assure long-term fiber reliability. Submarine optical fiber cable sea trial results are also stated for cables designed applying these studies.     

The Blown Fiber Cable

A radically new approach to optical fiber cable design and installation is described. Packages containing a number of optical fibers were drawn into preinstalled empty bores (tubes) using the viscous drag of air. The drag force acting on the fiber package is distributed along its length, which makes it possible to introduce fibers into complicated routes, with low strain. In this paper, we will concentrate mainly on the design of the fiber package, first from the point of view of the hydrodynamic forces acting on it during installation. This leads to a theoretical model for the installation process. Second, we shall consider the package as a subminiature optical fiber cable, and examine its optical performance during manufacture and temperature cycling, which leads to a theoretical model of the temperature performance of the package. Finally, we will describe a trial field installation using this cabling technique.     

Propagation of UWB Transients in Low-Voltage Installation Power Cables

This paper investigates the propagation of subnanosecond rise time (ultra wideband) voltage transients in low-voltage installation power cables. Experimental results are compared to simulations. It is concluded that the main mode of propagation of differentially injected transients in low-voltage installation power cables is transverse electromagnetic mode. Also, such transients would spread relatively unattenuated to any load or junction in the power system, received power primarily only limited by the impedance mismatches causing reflections. The effects of different types of bends in the cable have been studied. The study was conducted as a part of an assessment of the susceptibility of civilian facilities to intentional electromagnetic interference.     

FTTH网络光缆及其安装方式的趋势

FTTH网络进入加速建设期,针对FTTH建设的经济性和速度,应用于FTTH的光缆及其安装方式呈现出不同于干线网的特点,如具有小型化、密集容纤、易于跨中分接、干式缆芯等特性的光缆,以及机械连接、现场安装的连接器和预端接等连接技术。介绍了FTTH中光缆的配置与要求,并对FTTH网络中新型的光缆结构和特性及其现场安装技术进行了阐述。