城市架空绝缘线路设计中的几点建议

架空绝缘线路在设计时应综合考虑导线的安全系数、电杆的受力、砼电杆的强度、防雷及绝缘导线金具的选用。     

配电线路绝缘导线的防雷措施及分析

主要分析了近几年阜阳市配电网绝缘导线雷击断线的原因,结合当地的气象条件和多种防雷措施的比较分析,提出绝缘导线防雷措施的建议。     

10kV及以下架空绝缘线路及其防雷措施

文章阐述了10kV及以下架空绝缘导线的特点、应用范围和雷电对其产生的危害,针对线路防雷提出防雷措施。     

城市配电网基本现状及其防雷措施探讨

介绍了城网改造前后黄石市区配电网的基本情况，指出绝缘线断线是城市配电网大量采用绝缘导线后出现的新问题，简要分析了国内外所采用架空绝缘线的防雷措施，对提高黄石市区配电网防雷水平提出了一些建议。     

220kV紧凑型线路防雷性能及导线对杆塔空气间隙

本文给出适应于紧凑型线路结构特点的计算线路防雷性能的模型与方法.对不同导、地线布置,杆塔接地电阻及线路绝缘强度对防雷性能的影响进行了计算.所建议的导线对塔柱、上导线对横担的空气间隙值,以及提高防雷性能的措施,已被我国第一条220kV紧凑型线路设计采用.     

同杆（塔）架设多回路送电线路耐雷水平的分析

同杆（塔）架设多回路送电线路，三相导线一般为垂直排列，这就给线路防雷带来了不利因素：一方面增加了杆（塔）的高度；另一方面减小了导线与避雷线间的耦合系数，因此，耐雷水平较低。在采取架设耦合地线，或采用不平衡绝缘方式等措施来增大导地线间的耦合系数；或架设塔顶防雷引下线，来增大杆（塔）的等效截、减小杆（塔）的等值电感，从而提高同杆（塔）架设多回路送电线路的耐雷水平。     

同杆(塔)架设多回路送电线路耐雷水平的分析

同杆（塔）架设多回路送电线路，三．相导线一般为垂直排列，这就给线路防雷带来了不利因素：一方面增加了杆（塔）的高度；另一方面减小了导线与避雷线间的耦合系数，因此，耐雷水平较低。在采取架设耦合地线[1]，或采用不平衡绝缘方式[1]等措施来增大导地线间的耦合系数；或架设塔顶防雷引下线，[2]来增大杆（塔）的等效截面、减小杆（塔）的等值电感，从而提高同杆（塔）架设多回路送电线路的耐雷水平。     

高压送电线路导线和地线型号的选择

以往宁夏地区建设的高压和超高压送电线路，在导线和地线型号选择时，只考虑输送容量、机械强度、防雷和导、地线配合要求，忽略了线损问题，一般也不进行热稳定校验。这样可能会使一些已建成线路投运后，不能发挥最佳经济效益或造成安全运行隐患。此问题应引起有关系统规划和设计部门的重视。     

线路避雷器在防雷中的分流系数推导

为了解决线路避雷器在防雷中的分流系数计算问题,针对雷电直击输电线路的杆塔顶部及档距中央避雷线和雷电绕击导线等三种雷害情况,建立线路避雷器动作时的等值电路,推导出线路避雷器在防雷中的分流系数计算公式。计算结果表明,线路避雷器除利用其动作后的钳电位作用有效防止被保护相绝缘子串闪络外,还可起到分流雷电流的作用:在一般情况下,当雷电直击杆塔顶部时,可向导线分流7%~10%的雷电流;当雷击档距中央避雷线时,可向导线分流6%~8%的雷电流;而当雷电绕击导线时,可向大地分流70%~75%的雷电流。     

部分电缆替代法解决农村配电网电压质量问题

为了改善农村配电网电压质量,提出了1种馈线改造方法,即通过对造成馈线电压降的定量分析,得出了不同横截面积架空导线与电压损耗百分数的关系曲线。指出当导线横截面积较小时,通过增大导线截面积可以有效减少电压降,但进一步增大导线截面积则对电压降的改善作用逐渐减少,原因在于电抗因素逐渐成为电压降的主要贡献。并提出将架空馈线的一部分改造成3芯架空电缆,以有效降低母线到负荷之间的阻抗,从而有效治理电压偏差、电压波动和电压闪变。对比分析了敷设3相架空线和3芯架空电缆情况下电杆的承载能力,结果表明在大多数情况下3芯架空电缆可以直接在原有电杆上进行敷设。通过典型算例,验证了该方法的可行性和有效性。     

ADSS光缆的机械特性

与输电线路同杆架设的ADSS光缆同传统意义上的架空光缆完全不同,ADSS光缆的机械特性参数与输电线路的适用规范基本一致,与ADSS光缆线路的设计,安装,运行密切有关。     

悬链线模型与抛物线模型的差异性及其对ADSS设计的影响

介绍了架空线的两种数学模型，分析了悬链线模型与抛物线模型的差异性，讨论了二者对电力特种光缆、特别是对ADSS光缆设计的影响。     

Relationship between Creeping Discharge along Aerial Insulated Cable and Duration of Wave Front of Inductive Lightning Surge

We report the results obtained on the developing characteristics of creeping discharges along the insulated cable surface under inductive lightning surge voltages with various durations of wave front. The aerial insulated cables, usually, are supported by the post insulator and the binding wire at the reinforced concrete pole. When a lightning strikes near by the aerial insulated cables, the overvoltage due to the inductive lightning surge invades to the central line of the cable. The creeping discharge can develop along the cable surface from the free end of the binding wire just after a flashover of the post insulator at the cable supporting point. This creeping discharge may give rise to the accidents such as a melting or snapping of the cable. An important subject to prevent these accidents is to clarify the characteristics of creeping discharge along the cable surface and the developing mechanism of discharges. In this study, the impulse voltages with various durations of wave front are applied to the central line of the wire as the inductive lightning surge. The length and aspect of positive and negative creeping discharges developing along the cable surface are measured using a still camera with an image intensifier, and the developing mechanisms of creeping discharges are discussed on the basis of the models which are proposed taking into account the obtained results.     

推荐一种电力架空光缆防松鼠咬的新方法

松鼠咬伤电力架空光缆,影响电力通信网的安全运行。在分析研究以往常用解决方法的基础上,通过对电力架空光缆被松鼠咬伤的案例分析,推荐了一种简便有效防松鼠咬的新方法,供光缆线路运行维护部门和光缆工程设计单位借鉴。     

1000m跨距全介质自承式光缆生产与试验

阐述了１０００ｍ跨距全介质自承式光缆的结构，生产关键及进行的特殊试验。     

Development of a positive creeping discharge along an aerial insulated wire

In high‐voltage aerial distribution systems, the insulated cables are supported by the binding wire with the post insulator at the utility pole. When a lightning strike occurs in the neighborhood of the insulated cable in an aerial power distribution system, inductive lightning surges invade the central line of the cable. Then, creeping discharges develop along the cable surface from the binding wire tip at the same time as flashover of the post insulator at a supporting point of the cable. If the cable insulator has weak points such as pinholes, a malfunction near the cable supporting point may occur, with melting of the wire due to punch‐through breakdown. To prevent such accidents, it is important to clarify the mechanism of the creeping discharge along the insulated cable caused by the lightning strike. The polarity of creeping discharges depends on the polarity of the inductive lightning surges, and the extension length and aspect of the discharge differ greatly depending on the discharge polarity. The development of these creeping discharges is attributed to complicated behavior of the positive and negative electric charges. In the present study, we examined in detail the development of a positive creeping discharge along a wire surface by using a high‐speed image converter camera. This paper describes the mechanism of development of a positive creeping discharge based on the experimental results. 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(3): 20–29, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20997     

高压电缆金属护套交叉点行波折反射的规律

高压电缆的金属护套交叉互联导致行波在多个波阻抗不连续点产生了复杂的折反射行为,这对高压电缆线路的行波故障测距产生很大的影响。为研究高压电缆中行波的折反射规律,在波动方程的基础上,从独立的模量域推导出多导体系统在相量域的波阻抗矩阵,并利用相量域的波阻抗矩阵求解出折反射系数矩阵。此折反射系数矩阵表征了行波在护套交叉点的折反射规律。EMTDC仿真结果验证了所求取的折反射规律的正确性。进一步的理论计算和仿真试验表明,经多次折反射,行波线模总量保持不变,且三相线模含量存在着趋于一致的规律。     

The Development and Commercialization of Ignition Suppressant, Moisture Barrier Instrument, Control and Power Cables

Plastic coated metal shielding tapes are becoming more and more prevalent in the wire and cable industry. When these tapes are bonded to a chlorinated polyethylene jacket, a moisture/chemical barrier sheath is created that can be utilized in cables for above, ground applications such as in cable trays, in conduit or for aerial use on messengers. These designs can also be used for direct burial and inside buildings. The physical properties of the shielding tapes, combined properties of the tape and jacket, and the properties of various cable designs are all discussed. Additionally, case histories are reviewed which describe the use of these cables in various industrial environments. Specifically, the development of such coated tapes and chlorinated polyethylene jackets provides wire and cable users with additional sheath designs which can be used to reduce expensive maintenance and extend cable service life.     

电力架空光缆

与电力线平行的架空光缆泛指为电力架空光缆，按所用材料可分为金属光缆和介质光缆两大类，按敷设形式可发为（电力线）复用型、（杆塔）添加型和（电力线）附加型三大类，并可分为光纤复合地线（OPGW）、光纤复合相线（OPPC）、金属自承光缆（MASS），全介质自承光缆（ADSS）、捆绑光缆（ADL）和缠绕光缆（GWWOP）等主要六种，论文介绍了这些光缆的分类，基本结构和主要技术关键。     

电力架空光缆超长距离传输方案的探讨

长距离光传输技术受到电力通信基建和运行管理部门及设备制造商的密切关注，成为近年来通信业的热点技术之一。以光纤复合架空地线(OPGW)为代表的长途电力架空光缆光通信传输得到了长足发展。文章分析比较了各类光纤的传输特性，并详细介绍了几种光纤放大方式和色散补偿，提出了7种利用OPGW光缆传输的方案，并做了简单地分析及比较。