ADSS光缆的施工,测试和竣工验收

介绍了ＡＤＤ光缆通信工程中光缆施工方法、注意事项、光缆熔接测试时的技术要求,以及光缆竣工验收的主要内容等。     

ADSS光缆外护套抗干带飞弧能力的新试验方法

首先简要地回顾了ADSS光缆外护套受干带飞弧侵蚀的机理，介绍了国外近年来研究试用的外护套抗干带飞弧试验的新方法和应用这种新方法所取得的实验结果。根据这些结果和其他考虑，提出了尚待进一步探讨的若干问题。     

Study on development of dry band on ADSS fibre optic cable

All dielectric self supporting (ADSS) fiber optic cables are suffering from damage caused by dry-band arcing. This paper investigates the formation of the dry band, which is crucial to the arcing. The formation of the dry band is the result of evaporation of water deposit some point on the cable surface. When the dry band is formed the current is interrupted. Then high voltage is applied to the small gap separated by the dry band, and may cause arcing. This paper discusses the drying process of the wet layer on the surface of the cable in detail. The differential equation of the drying rate is formulated and numerical simulation is performed. With this equation, the time-to-arcing and variation of the layer resistance can be estimated. For verification of the results, the time-to-arcing and layer resistance are measured in the laboratory. The numerical results provide guidance for design of an automatic dry-band arcing aging test system. The onset of arcing is investigated based on the results.     

Chemical changes at the surface of RTV silicone rubber coatings oninsulators during dry-band arcing

Under wet and contaminated conditions dry band arcing occurs on the surface of HV outdoor insulators coated with room temperature vulcanizing (RTV) silicone rubber. The thermal impact of the arcing on the surface of the RTV causes chemical changes. The gradual loss of hydrophobicity due to dry band arcing is of considerable concern because it results in a reduction of the withstand voltage and subsequent failure of the insulator and power outage. In this study the RTV coatings were subjected simultaneously to salt-fog and electrical stress. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and electron spectroscopy for chemical analysis (ESCA) were then employed to investigate the chemical changes. Possible chemical reactions and processes occurring under dry band arcing are suggested. The results of ATR-FTIR and ESCA indicate the formation of low molecular weight polydimethylsiloxane (PDMS), the reduction in the surface density of CH3 groups and crosslinking of the PDMS backbone chains at the surface. Chemical derivative analysis was also carried out to further elucidate the chemical changes on the surface of RTV coating     

ADSS光缆半开剥接续方法分析

随着电力系统光纤通信技术的发展,光缆接续的质量在通信网建设中的地位越来越重要。文章描述了光缆接续的过程和步骤;针对电力系统中使用的ADSS光缆,详细介绍了一种改进的光缆接续法———半开剥接续法;并提出了光缆接续时应注意的问题。半开剥接续法在紧急故障抢修时尤为实用,实践证明,应用半开剥接续法可以提高光缆接续效率。     

卫辉站ADSS光缆断缆故障分析

对卫辉站ADSS光缆的断缆故障进行了分析、计算，根据计算结果提出结论及整改建议。     

新乡220 kV输电线路ADSS断缆事故分析

文章简要介绍了电力电磁场与力场的耦合计算，以及仿真系统（NASTEL）采用的输电线路周围电位和电场计算的基本方法，应用该软件计算了新乡220kV输电线路ADSS光缆周围的电位和电场分布，重点分析了转角和跳线对电场分布的影响，揭示了断缆事故发生的原因，最后针对电力系统ADSS光缆的设计和施工提出了一些建议。     

Engineering a solution to the aging of HV self-supporting cables by dry-band arcing

The retrofit rod of controlled resistivity clearly has the potential to remove the threat of dry-band arc damage on all-dielectric, self-supporting (ADSS) cables. This is achieved by reducing the maximum current available on the cable for arcing activity. Rods can be applied to polyethylene sheathed cables or arc-resistant sheathed cables and can improve the performance of both. Extensive trials in the UK have shown that the rod works and have confirmed predictions of computer models. However, the engineering of the application of such as solution is complex. Individual spans of different geometry, including cable sag, must be considered. In particular, local variation in pollution is critical; so knowledge of the proximity of the sea or industry must be considered. It is also very likely areas that do not experience much rainfall will be particularly onerous because the cable will not be naturally washed regularly, so the pollution on its surface will tend to build up, reducing its resistance in times of high humidity, fog, and dew.     

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。     

ADSS光缆工程应用问题研究

论文详细论述了ADSS光缆工程应用中部分亟待解决的问题，包括机械、电气、环境和动态条件下的应用问题，并对该领域今后的发展进行了讨论。     

ADSS光缆设计与制造

本文详细论述了 ADSS光缆设计过程及其性能的计算。通过长期生产实践 ,提出了 ADSS光缆制造的关键技术 ,并对其进行了分析和讨论 ,提出了制造过程中的注意事项 ,最后还介绍了 ADSS光缆设计制造软件的开发     

利用光纤通道传输继电保护信号

随着光纤技术的迅猛发展，利用光纤传输继电保护信号，已获得了业内人士的普遍欢迎。文中简述了光纤在继电保护信号传输中的优势，并通过工程实例，介绍光纤传输保护信号时的常见故障及其处理方法，最后对光纤保护的前景进行了分析。     

Tests on XLPE-insulated cable arcing faults and arc-proofing

Questions about the adequacy of arc-proofing have arisen in connection with underground systems using XLPE-insulated cables, because of an increasing number of arc faults. Extensive testing at available short-circuit-current levels of 8 kA is described. The results indicate that a minimum safe distance of 50 cm should be maintained for nonarc-proofed equipment. For equipment protected with arc-resistant tape, this distance can be substantially reduced. Standard tests based on the use of faulted XLPE cable ends are proposed to verify arc-proofing effectiveness and the arc-resistance of materials     

光纤光缆的技术发展及其标准的动态

随着通信业务量爆炸式地增长和高速、大容量的传输系统建立 ,光纤光缆的新技术得到了飞跃进步和发展。本文介绍了传输性能优良、适用性更强的各类新品种光纤 ,以及随之而出现的光纤光缆标准制定、修改和更新的情况及其技术的新需求。文中对通信用玻璃光纤制造技术的进步和塑料光纤技术的发展也作了较详细的介绍     

工频电场对ADSS光缆特性的影响

通过实验观测输出光功率与不同电场强度等级及时间的关系，在假设的基础上分析了工频电场引起光纤晶体的晶轴角度的偏转，详细说明了工频电场对光纤折射率及光传输模式的影响及其改善方法。     

工程建设期间影响ADSS光缆运行可靠性的几个因素

叙述了ＡＤＳＳ光缆的安全可靠运行与设计、产品质量、施工质量、维护管理等各个环节的关系。强调协调了ＡＤＳＳ光缆工程建设中各环节的关系和做好ＡＤＳＳ光缆建设期间的各项工作,将为今后ＡＤＳＳ光缆的可靠运行打好基础。     

A method for detecting the transition from corona from water droplets to dry-band arcing on silicone rubber insulators

The paper presents an investigation on the use of partial discharge (PD) as a means to study the development of leakage current (LC) on silicone rubber insulators in a salt-fog chamber. Simultaneous measurements of LC and PD on dead-end type silicone rubber insulators exposed to different combinations of electrical stress and salt-fog salinity are performed. The results show that for an electrical stress of 33 V/mm applied to the insulator, the average LC experiences gradual changes and reaches a critical level (around 1 mA) where dry-band arcing is observed after 20 minutes at 2300 /spl mu/S/cm, and after 25 minutes at 1800 /spl mu/S/cm. The corresponding PD levels reach hundreds of pC after 15 minutes at 2300 /spl mu/S/cm, and after 20 minutes at 1800 /spl mu/S/cm. For a salinity corresponding to 1800 /spl mu/S/cm and stress of 26 V/mm, the LC changes much more gradually and reaches the critical level only after approximately 60 minutes. The corresponding PD reaches hundreds of pC after 30 minutes and more than 1500 pC after 60 minutes. Pattern recognition techniques have been applied to investigate the transition from corona to dry-band arcing. The features extracted from the maximum and mean apparent charge trends are found to be useful to cluster and classify the two phenomena. Simultaneous visual observations of the discharges on the insulator surface support the results. The investigation, therefore, shows that PD is a sensitive method for detecting the transition from corona from water droplets to dry-band arcing and an alternative method for studying the early aging stage of silicone rubber insulators.     

ADSS设计张力取值的探讨

通过对我国现行设计技术规程与IEC826标准进行比较,对ADSS线路设计中最大张力的取值进行探讨。     

ADSS光缆舞动及其试验

介绍了ADSS光缆线路上引起舞动的条件和机理。重点介绍了IEEE－P1222附录C的舞动试验要求及所做舞动试验的结果。