架空光缆外护套材料力学性能的自然老化试验

采用对架空光缆外护套材料试件进行长期自然暴晒的试验方法,对国内部分地区运行中的架空光缆存在的外护套力学性能劣化问题进行了分析,总结了不同种类外护套材料主要力学性能随时间变化的趋势:低烟无卤阻燃外护套材料的断裂伸长率下降最为明显,暴晒8年后该性能保留率仅为44.1%;线性低密度聚乙烯在三种聚乙烯外护套材料中更具耐环境应力开裂的优势。     

通信电源用电缆及其通信行业标准

本文重点解读通信电源用交联聚烯烃绝缘电缆通信行业标准的主要内容,介绍了交联聚烯烃绝缘的技术特点.评述了聚氯乙烯（PVC）绝缘电缆在环保和安全方面存在的不足.通过比较说明了交联聚烯烃绝缘电缆相对于PVC绝缘电缆和非交联的无卤低烟阻燃聚烯烃绝缘电缆所具有的优势.本文还介绍了低压电缆制造技术,特别是交联工艺路线、电缆料添加剂及电缆料配混技术进展等方面的内容,对未来通信电源用电缆的发展以及标准修改内容提出了建议.     

电力电缆及隧道在线监测与移动巡检协同策略探讨

基于在线监测系统和移动巡检设备对于电缆本体及通道环境状态感知具有互补性、交叉性和相关性的特点,提出一种在线监测系统与移动巡检系统相互协同的电力电缆及遂道状态感知方法,通过两者之间的双向协同策略,使其能够在宿主设备故障确认、融合分析和检测系统自身状态检查方面相互配合,有效提升了电力电缆及隧道运维的智能化水平。     

Long distance renewable-energy-sources power transmission using hydrogen-cooled MgB2 superconducting line

Renewable Energy Sources (RES) exploitation for electric energy and hydrogen production has been identified as one of the leading ways towards a future sustainable energy system. Hydrogen can be stored and transported in gaseous (GH₂) or liquid form (LH₂). When large hydrogen storage is required, liquefaction can be convenient with respect to compression, because of its higher storage density. LH₂ can also be used as a coolant for superconducting lines, acting at the same time as energy vector and cryogen. In particular, in this paper we focus on the MgB₂ material mainly due to economic considerations and working temperature match with LH₂. A system for large scale RES exploitation allowing flexible and controlled delivery of electric energy and LH₂ is presented. For the thermo-hydraulic design, a method is proposed which resorts to compressible fluid equations put in a convenient simplified form. A case application with 20 km distance between cooling stations is considered, and the need of taking into account LH₂ compressibility for pipeline design is shown.     

均匀同轴电缆的瞬态响应的研究

一、前言均匀同轴电缆因其优良性能在现代测量技术中获得了广泛的应用。早期是研究正弦电信号的传输,寻求电缆传输特性的稳态解。近来,需测诸如亚微秒宽度、纳秒变化沿的单次脉冲,则要研究其瞬态解,目前已有若干研究结果。巴纳研究理想同轴电缆端接失配电阻的传输特性,得阶跃响应的解析解。Zaengle则研究端接混合元件的情况,给出了阶跃响应的计算机解,而非解析解。Wigington研究了低损电缆匹配端接时的传输特性的解析解。     

Calculation of Maximum Permissible Load Currents under Cyclic Loading Conditions for Cables Laid in the Ground and in Pipes in the Ground

A method for calculating the maximum permissible load current under the conditions of cyclic daily load curve is developed. A system is suggested for parallel cables laid in the ground, including in pipes. The coefficients for determining permissible load currents are calculated for different laying variants. Calculated data for cables arranged in 2 × 2 and 2 × 4 blocks are presented.     

更换焦炉横拉条及弹簧时对炉柱的固定

介绍了造成贵阳煤气气源厂2#焦炉横拉条及其弹簧腐蚀、失效的原因和更换时传统的对炉柱固定的办法存在的问题，详细介绍了一种固定的炉柱的简便办法及其效果。     

哈尔滨太阳桥钢结构安装施工

由于本工程钢结构较独特,原拟定的安装施工方案安全度差,施工前准备费用高、设备及设施不能重复利用。为此经多次研讨优化改用现场全焊接钢结构施工,既保证了安全及工期要求,费用又省。     

A review of dielectrics for flexible superconducting cables

The tape materials for the dielectric of a flexible superconducting cable are discussed. The tape is wrapped around the superconductor and is impregnated with supercritical helium. Based on mechanical and electrical performance the most promising materials are Valeron, high density polyethylene, polypropylene, and nylon 11. A final assessment is made based on life expectancy and mechanism of electrical failure both of which are a function of discharge activity in the tapes.     

南昌生米大桥系杆索制作及安装

针对南昌生米大桥的工程特点和平行钢丝拉索的结构及使用特点，本文阐述了生米大桥专用系杆索的制作、运输、安装、张拉等施工工艺，对类似体外预应力工程的设计和施工有一定的参考价值。