特种绕组线的发展

本文简要的介绍了国内外最近绕组线 (包括纤维绕包线、薄膜绕包线、纸包组合及换位导线等 )及部分特种绕组线 (如无机绝缘电磁线、耐高温耐辐射电磁线、绞合电磁线、片状成型线圈等 )发展动态。另外 ,还介绍了绕包工艺及设备的最新进展     

尼龙护套线的生产

介绍了尼龙护套线品种及材料性能。对尼龙护套的挤出设备的要求和提高产品质量的措施也作了较详细的说明。     

Ultrafast Wigner transport in quantum wires

Two quantum-kinetic models, governing the transport of an initial highly non-equilibrium carrier distribution generated locally in a nanowire, are explored. Dissipation processes due to phonons govern the carrier relaxation, which at early stages of the evolution is characterized by the lack of energy conservation in the collisions. The models are analyzed and approached numerically by a backward Monte Carlo method. The basic difference between them is in the way of treatment of the finite collision duration time. The latter introduces quantum effects of broadening and retardation, ultrafast spatial transfer and modification of the classical trajectories, which are demonstrated in the presented simulation results.     

Hydrodynamic modeling of silicon quantum wires

A hydrodynamic model for silicon quantum wires is formulated by taking the moments of the multisubband Boltzmann equation, coupled to the Schr?dinger-Poisson system. Explicit closure relations for the fluxes and production terms (i.e. the moments on the collisional operator) are obtained by means of the Maximum Entropy Principle of Extended Thermodynamics, including scattering of electrons with acoustic and non-polar optical phonons. By using this model, thermoelectric effects are investigated.     

Zinc coating control on steel wires

Galvanic steel wire manufacturers have to fulfill several international regulations regarding zinc mass by surface unit. This article presents a new sensor to measure this parameter online. Details about the different parts of the system (sensor, circuitry, adjustment, and signal processing) are explained. Experimental results in a real manufacturing line are also presented. Online measurement conserves zinc mass and guarantees savings     

High-frequency heating of wires during thermal treatment

A calculation method for modes of high-frequency heating and sintering of magnet wire insulation is proposed that ensures the required insulation hermiticity and high insulating characteristics. The choice of inductor types of high-frequency oscillators used for insulation heating is assured. Inductor dimensions are optimized depending on the diameter or dimensions of heated wire.     

薄壁绝缘汽车线的生产

介绍了薄壁绝缘汽车线生产所需生产设备、绝缘材料要求,以及生产过程常见问题与解决的方法。     

铝包钢线的性能特点及其应用分析

本文介绍了近年来国际上广泛用于电力输配、通信等行业的高性能导线——铝包钢线。通过与各类导线的性能比较 ,表明铝包钢线在耐蚀性、导电性、线材强度等方面都表现出优良的性能 ,在经济方面与钢芯铝绞线比较 ,每年每公里可节省费用 6千多元     

汽车用线缆的新发展

本文介绍随着汽车工业的现代化而对汽车内所用的电线电缆的改进。这些改进主要是用双金属线(铜包钢和铜包铝)来替代传统的铜导线;用新型的可交联聚酯弹性体来替代传统的绝缘材料。其主要目的在于减小线缆的尺寸和重量,增加了线缆的柔软性、耐热水性和耐热性等机械物理性能。文章描述了这些新产品的开发、性能试验和应用。     

关于正确使用携带型短路接地线的探讨

介绍了黑龙江省电力系统接地线使用的状况。对短路接地线允许电流值进行了理论计算，分析了保护动作时间对不同截面积短路接地线允许电流的影响。通过电网运行数据与计算数据的对比分析，提出了具有操作性的建议，可引导技术人员正确选择和使用接地线，确保人身和设备安全。     

Laser-action in V-groove-shaped InGaAs-InP single quantum wires

We report on the realization of a V-groove-shaped single quantum wire (QWR) laser in the material system InGaAsP-InP. First, we discuss a new laser concept that makes use of a semi-insulating (s.i.) current-blocking layer and InGaAsP wave-guiding layers. Simulations demonstrate the concentration of both the current as well as the optical field in the active region. We developed a two-step wet-chemical etching process, to form high-quality V-grooves into a layer stack consisting of InP and InGaAsP. By employing anisotropic wet-chemical etching and anisotropic metal-organic vapor-phase epitaxial (MOVPE) growth, we demonstrate the feasibility of this concept. We show laser action originating from a single InGaAs QWR realized in this concept. The source of a second laser line measured with electroluminescence (EL) spectroscopy is discussed     

耐电晕绕组线的发展

本文以变频调速交流电机的发展为背景,综述了国内外变频电机用耐电晕绕组线发展概况,最后提出我国今后发展的几点建议。     

双绞线电磁干扰防护研究

水下自航器紧凑而狭小的结构要求其内部大量的线缆成束敷设,这使得线缆串扰问题成为其系统电磁兼容性设计一个关键考虑因素,双绞线凭借其良好的电磁兼容(EMC)特性在水下自航器中被广泛采用。基于线缆串扰的传输线模型,对比分析了单线与双绞线的抗干扰特性,并重点对双绞线端接不同负载下的抗干扰能力进行了仿真与试验研究。试验结果表明双绞线端接负载对其抗干扰能力有比较明显的影响,实际电磁兼容工程设计中必须予以考虑。研究结果可用于指导水下自航器中线缆布局的电磁兼容性优化设计。     

The high-frequency phenomenon of copper clad aluminum wires which are lower the alternating current resistance than copper solid wires,and the application of copper clad aluminum wires to the electrical equipment

The paper is proposed approximate formulas of the ac resistance of lead wires and coils which made by using copper clad aluminum (CCA) wires. There are the frequency range that the ac resistance of CCA wires is lower than it of cupper solid wires for lead wires and coils of an electrical equipment. It is shown that the application of CCA wires is economical as comparing with copper solid wires, if the design is due to successful calculation in the electrical equipment. The measured resistance is compared with the formula. CCA wires is an example of multiple conductors which shall be expected to apply in future.     

敷设屋内配线的注意事项

屋内配线在安全合理用电方面起着重要的作用。下面提出几点应注意事项供参考。1　注意电器的类别在新装或改装屋内配电线路时 ,应按电器负荷的不同类别 ,适当考虑需用系数及发展系数来选配导线。线路负荷电流应小于线路导线的安全载流量。照明及电热负荷 ,导线的安全载流量 ( A     

Self-damping measurements of conductors with circular andtrapezoidal wires

Self-damping characteristics of three types of conductors with seven different sizes were studied. Conductor types considered were ACSR round and trapezoidal (TW) wires as well as self-damping (SD). The power method was used in the measurement of self-damping of all three types of conductors. For each conductor, damping measurements were made at three tension levels (10, 25 and 40% of rated tensile strength of conductor) for frequencies ranging from 5 to 55 Hz and normalized peak-to-peak amplitudes varying between 25/f to 150/f where f is frequency in Hz. Empirical relationships were derived to estimate the power dissipation values for all other frequency and amplitude levels. Results obtained from tests conducted on ACSR round and trapezoidal wire conductors of similar diameter indicated that the ACSR TW conductor in general has higher internal damping when compared to ACSR round wire conductor. However this trend was not necessarily observed at low frequencies. It was also noted that power dissipation increases with increase in size of the conductor     

光纤差动保护的导引线接口装置

随着光纤电流差动保护的广泛应用,其保护原理、功能也更加完善.作为第一代电流差动保护的传输通道--导引线也彻底被光纤所替代.但在少数地区,由于铺设光缆难度太大,仍在继续使用导引线.如何能使光纤差动保护装置运行在导引线传输通道上,既不改变保护装置的功能,也不需重新铺设光缆,便因此提了出来.针对这一特殊要求,开发了光纤差动保护的导引线接口装置.使用该接口装置后,光纤差动保护不需作任何改动,就可以在导引线通道上运行,且保护的动作特性不受影响,该接口装置同样适用于光纤纵联保护装置、光纤命令传输装置在导引线上的运行.     

OPPC光纤复合架空相线的应用

OPPC（Optical Phase Conductor）是电力通信系统的一种新型特种光缆,是在传统的相线结构中将光纤单元复合在导线中的光缆,使之具有传输电能及通信的双重功能。为有效利用现有中低压配网资源．降低通信线路投资成本,江西鹰潭供电公司在国家电网公司10kV系统率先采用OPPC复合光缆架空相线。通过对10kV梅开线OPPC改造工程可行性分析、计算,确定将该线B相导线更换为OPPC光缆,并一次投运成功。该工程的成功投运标志着江西省电力系统通信线路架设方式将进入新的阶段。     

特殊电机用漆包线的发展

本文以 8 0～ 90年代部分特殊电机用漆包线的国内外发展情况回顾我国绕组线的发展概况 ,并展望今后的发展动向和市场前景。指出 ,目前我国已经是世界上绕组线的生产大国 ,但要真正成为一个高技术的绕组线生产大国 ,还必须脚踏实地的努力于基础工作