射频电子线缆的国内外动态

本文从技术和市场的角度分析了ＣＡＴＶ电缆,射频电缆,污漏电缆,第５类和第６类电缆的国内外发展动态。在本文的最后一部分,作者总结归纳了射频电子线缆的十个发展趋势。     

局域网用多对数数字电缆的结构与性能

介绍了局域网用多对数主干数字电缆的同心式和子单位式两种缆芯结构.根据IEC 61156-4-2003标准,介绍了多对数主干数字电缆的主要电气性能要求.对比测试了以上两种结构的25对主干数字电缆的主要电气性能,得出两种电缆各自的优缺点,分析了影响这些性能的主要因素.     

基于CPLD的测井电缆传输系统的方案设计

分析了测井电缆传输系统的现状，提出一种基于CPLD高速测井电缆传输系统设计方案，并对此测井电缆传输系统的系统功能以及鳊解码方案做了简要说明。     

基于GPRS的城市照明电缆防盗报警系统

本文分析了当前照明电缆防盗技术的原理和缺陷,提出了采用漏电流技术实现理想的照明电缆防盗技术要求。利用该技术,设计出基于GPRS/GSM通讯网络的城市照明电缆防盗报警系统。     

市话电缆市场走势的展望与分析

本文介绍了我国市话电缆近十几年生产技术、规模的发展概况，对今后市话电缆市场走势从多方面进行了分析。并就面对激烈的市场竞争格局，通信电缆制造业如何制造业如何把握市场和技术发展趋势，及时调整产品结构提出了建议。     

变电站电缆防火措施的探讨

分析了变电站电缆的运行特点和电缆防火措施，指出了变电站建设工程中电缆施工时应注意防火的问题。     

利用带式舟布放水底电缆及应注意的问题

利用带式舟布放水底电缆及应注意的问题刘沪阳在某电缆工程中需布放数公里的水底电缆，使用普通的船舶需多次布放，且水上接头作业较多，既不便施工，也无法保证电缆的气闭，因此，希望水上接头作业量越少越好。这次施工中，由于使用了舟桥部队的某型带式舟（见图１）使得...     

全塑市话电缆绝缘电阻分析

本文对影响全塑市话电缆绝缘电阻的诸方面因素进行了深入的理论分析；介绍了绝缘电阻的测试及其意义；结合实际阐述了提高全塑市话电缆绝缘电阻的有效途径。     

澳洲交通信号综合应用电缆的研制

澳洲交通信号综合应用电缆的研制不仅可满足澳洲道路交通项目建设需求,而且可使我国电缆进一步进入澳洲及国际电缆市场。根据该电缆的使用要求以及澳洲标准AS/NZS 2276.1:2004要求,进行了电缆结构设计、材料选型、工艺优化、试验验证。通过合理的结构整合和优化调整以及工艺难题的解决,使该电缆集电能传输、调节控制、设备连接等功能为一体,结构紧凑易于安装敷设,同时具有环保、阻燃、柔性、安全等特点,并且提升了电缆的耐温等级、耐老化和耐候等性能,进一步延长了电缆的使用周期。     

长途通信电缆的防水性能结构设计

文章就长途通信电缆的防水结构设计进行了研究：简要介绍了长途通信电缆的防水性能需求,分析了防水电缆的实现原理与结构设计,在此基础上重点对XLPE电缆的径向防水和纵向防水两种防水设计与结构实现进行了详细探讨。     

有线电视屏蔽传输电缆电容的LBEM分析

屏蔽传输电缆把电视信号送进千家万户,而电感、电容等特性参数对传输电缆上的信号质量评估起着重要作用。介绍用线性边界元计算多芯屏蔽传输电缆电容的基本原理,3个工程实例的计算结果表明:有线电视屏蔽传输电缆电容不仅与芯线排列有关,还与芯线截面形状有很大关系。     

Evaluation of measured complex transfer impedances and transferadmittances for the characterization of shield inhomogeneities ofmulticonductor cables

Besides the knowledge of the primary line parameters per unit length, the determination of the complex transfer impedances and transfer admittances of shielded multiconductor cables is the prerequisite for the calculation of the propagation of disturbing currents on the inner wires of the cable. With a measurement procedure based on triaxial measurement setups using multiconductor transmission line theory for evaluation, it is possible to determine individual transfer impedances and admittances for each inner conductor of a shielded multiconductor cable over a broad frequency range. This paper shows the measurement procedure, the method of evaluation: and from measurement results, the determination of the location and the calculation of the area of single-shield inhomogeneities by the evaluation of measured transfer impedances and transfer admittances     

Deterministic modeling of the (shielded) outdoor power line channel based on the multiconductor transmission line equations

In this paper, a complete methodology is proposed for the deterministic modeling of the channel transfer functions associated with underground power line access networks, in the light of the Multiconductor Transmission Line Theory. Some multiconductor power line cables are analyzed in detail, and their fundamental propagation characteristics (definition of eigenmodes, phase velocity, characteristic impedance, lineic attenuation) are related to the geometry of the conductors and the material properties. A multidimensional scattering matrix formalism is then introduced to perform an accurate analysis of the global power line network including multiconductor cable segments, derivation points, and termination loads. An illustrative example of a power line access network with three types of cables (with different numbers of conductors), 20 derivations, and five remote terminals, is finally proposed.     

Spice equivalent circuit of a two-parallel-wires shielded cable for evaluation of the RF induced Voltages at the terminations

A SPICE circuit model is developed for the evaluation in frequency and time domain, of the common and differential mode voltages at the terminals of a two-parallel-wires shielded cable during a current injection test. The proposed circuit is an exact equivalent of the model's governing multiconductor transmission line equations without the need of any subdivision in elementary cells and takes into account the presence of both transfer impedance and admittance.     

On Reducing the Lightning Transients in Buried Shielded Cables Using Follow-On Earth Wire

This paper investigates the importance of a follow-on buried bare earth wire for the lightning protection of buried shielded cables. The use of follow-on bare wires for lightning protection of communication towers was suggested as a recommendation in certain standards, without being complemented either by theory or experiments. When lightning transients couple to the cable shields, it induces large currents (depending on the type of coupling) causing transient overvoltages between the inner conductors and the shield. It is shown by simulations based on multiconductor transmission line theory that if the follow-on bare earth conductor is placed in parallel with the shielded cable with the bare earth wire connected to the shield at the current injection end, then the shield current, and thereby, the internal transient voltages of the cable are reduced considerably.     

异型结构特种圆-扁电缆的研制

针对特殊使用场合电子设备中空间狭小、结构复杂的特点,研制了一种圆形结构与扁平带状结构一体化的异型电缆,其可满足特殊使用场合对电缆机械性能和电气可靠性较高的要求。该电缆选择了新型交联乙烯-四氟乙烯共聚物（X-ETFE）作为绝缘材料,甲基乙烯基硅橡胶作为护套材料,以确保电缆的整体柔软性和成型性。通过特殊设计的模具,采用高温模压工艺进行了该电缆的成型。     

保护层结构对铁路信号电缆机械性能的影响

针对铁路信号电缆施工现场提出的加强铁路数字信号电缆机械性能的要求,主要研究了增强电缆保护层机械强度来提高铁路数字信号电缆机械性能的可行性。参考室外直埋式光缆的机械性能试验,根据铁路信号电缆施工现场的环境,提出了反映信号电缆机械性能的专项技术要求和试验方法。将新试制的保护层加强型信号电缆样品与既有的普通保护层信号电缆样品进行了机械性能的对比试验,试验结果表明,相比于相同型号的普通保护层信号电缆,保护层加强型信号电缆的机械性能提高不明显。     

A simplified approach to determine the amplitude of the transientvoltage induced on a cable bundle

Studies the transient response of a multiconductor transmission line, by using the formalism of multiple reflections. This often requires an experimental characterization of the cable bundle that becomes tedious for a large number of conductors, In order to reduce the experimental task, the authors bring two simplifications: the first one is based on the approximation of totally degenerate modes, the second one on the approximation of semi-degenerate modes, Then, some experiments with real bundles have been achieved to validate these simplifications     

Transmission Line Mode Response of a Multiconductor Cable in a Transient Electromagnetic Field

This paper describes a technique for obtaining the induced worst case currents on individual wires of a multiconductor cable as a result of a transient electromagnetic radiation field. The technique involved a development of the expression for the induced current in matrix form where the mutual coupling terms and the other cable currents are the pertinent parameters. A worst case solution results from the assumption of maximum coupling orientation of the individual wires. A short example and some test results are presented. The test results show wave shapes for inductive and capacitive coupling. The solution for the individual wire current due to a transient electromagnetic field is important, since it will greatly reduce the required number of cable measurements and will allow the development of improved shielding techniques.     

新型无机绝缘防火电缆的研制

介绍了一种新型无机绝缘防火电缆的结构设计。详细阐述了绝缘材料与耐火膨胀材料的选择,电缆防火性能的试验研究,电缆技术指标及其性能和特点,敷设和应用情况。该新型无机绝缘防火电缆能弥补传统防火电缆的不足,且具有高性价比,应用前景十分广泛。