低压电力电缆的选择及施工中应注意的问题

敷设电力电缆必须做好电缆线路规划设计。介绍了低压电力电缆选择的方法和敷设电缆注意的要点。     

基于知识蒸馏算法的电缆专业知识库应用

电缆全寿命周期内的标准、规程、法规是电缆从业人员开展工作的依据,而齐全、权威且方便查阅的标准和规程是指导电缆各项工作开展和城市电网安全稳定运行的重要保障。介绍了所开发的电缆专业知识库系统,基于小规模样本知识蒸馏算法,实现电缆专业知识库的关键词匹配搜索、笔记摘抄学习以及论坛的学习探讨等功能,提升了电缆从业人员查阅资料、员工学习的效率。     

基于MicroStation的BRCM三维敷设软件的应用研究

以某航运枢纽工程为例,介绍了基于MicroStation平台BRCM(Bentley Raceway And Cable Management)电缆敷设软件的使用流程及实际应用情况,并对110kV高压电缆进行实体建模,开展电缆敷设的精细化设计,有效解决二维电缆桥、支架布置及人工电缆敷设出现的交叉碰撞、设计效率低、材料统...     

风电机组使用铝电缆替代铜电缆的可行性分析

本文介绍了风电场使用的电缆种类及性能要求,分析了在铜电缆的价格不断攀升的情况下,在风电机组中使用铝电缆替代铜电缆的可行性,并通过案例介绍对铝电缆在技术、工艺、成本等方面进行了可行性分析。     

干式高压电缆终端头登塔装置的设计与应用

介绍一种新型的GDZ 110kV干式高压电缆终端头的设计原理和结构特征,主要是具有沿面电压分布均匀、污闪电压高、无油、无瓷、结构轻巧、价格便宜等特点。基于该设备研发了电缆终端头登塔(杆)装置,主要是通过横担将电缆终端头的固定和架空导线的挂点功能两者合一,简化了电缆终端头与架空导线的连接方式。在110kV变电站进线工程中推广使用后,设备运行状态良好,不仅提高了电缆终端头的可靠性,还解决了城市景观道路旁电缆登塔征地难的问题。     

热缩电缆附件在工厂节能供电中的应用

论证了油纸电缆与交联电缆过渡接头采用热缩电缆附件的可行性,根据市场现有的热缩附件设计了过渡接头工艺,介绍了该工艺在工厂节能供电生产实践中的应用情况。     

带电电缆识别仪在低压电缆台区普查工作中的应用研究

低压电缆与用户供电点关联的正确性是低压电缆台区线损管理的重要基础环节,同时也是低压用户准确停电的保障。介绍了带电电缆识别仪的工作原理,阐述了具体接线方式和安全注意事项以及在现场应用过程中可能遇到的问题及相关解决措施。通过现场典型应用举例,验证了带电电缆识别仪在低压电缆台区普查工作中应用的有效性。     

35 kV电缆雷电过电压仿真与分析

介绍了由于雷害造成电缆击穿事故的实例。根据故障记录波形和电磁暂态仿真软件EMTP-ATP对事故成因和过程进行仿真分析。结果表明,对于进线具有电缆段的变电站,当电缆末端空载时,雷电过电压波会沿着架空线路传到电缆末端产生全反射,造成电缆电压过高,超过绝缘水平继而击穿接地发生事故。此类变电站应注意避免电缆末端开路的运行方式,并且考虑在进线端处加装避雷器等保护装置。该结论为变电站防雷设计提供了参考。     

220kV枢纽站不同电压等级多回路大截面

对北京地区220kV枢纽站不同电压等级多回路、大截面电缆出线优化布置进行了介绍,阐述了大截面电缆出线优化布置原则,解决了多回路电缆纵横交叉跨越、布置混乱、不利于施工及运行维护问题,并结合实例工程对大截面电缆出线优化布置举例说明。     

不同电压等级架空线和电缆混合线路的过渡方式

架空线与电缆的过渡方式,一般分为地面过渡和杆塔过渡两种。介绍了上海地区不同电压等级的输配电线路,采用不同型式的架空线和电缆之间的过渡方式,例如:220kV采用电缆终端站方式;110kV采用电缆登塔或电缆登杆方式;35kV与10kV采用电缆登杆方式。实践证明,上海地区针对不同电压等级,采用架空线和电缆混合线路的过渡方式,具有较好的技术性和经济性。     

Optimization of cable layout designs for large offshore wind farms

Installation of a wind farm exposes several problems such as site selection, placement of wind turbines in the site, and designing of cable infrastructure within the farm. The latter problem, called cable layout design, is the determination of cable connections among turbines and one or more transmitters such that energies generated by turbines will be sent through the cable routes, and eventually gathered at the transmitter(s). This problem is especially important for offshore wind farms where the featured and expensive cables are used. The main objective of the present study is to address the cable layout design problem of offshore wind farms to reduce cable costs in the design using optimization-based approaches. The problem, firstly, is modelled as a mixed integer linear program (MIP) under a set of real-life constraints such as different cable and transmitter types and non-crossing connections between the turbines. Then, a novel mathematical model, which is a modification of the MIP model by imposing several heuristic rules, is proposed to solve the layout problem of large offshore wind farms. Experiments on a set of small- and moderate-sized test instances reveal that the heuristic model, MIP_H, reduces the computer time nearly 55% compared to that of MIP model while the average cable costs generated by the models are close to each other. MIP_H, besides its efficiency, provides more cost-effective layouts compared to MIP model for large-sized real-life examples. Additionally, a comparative study on MIP_H and existing methods in the literature shows that MIP_H is able to solve all instances of the real-life examples providing less cable costs in average.     

电缆沟结构模型的现状和设计优化

分析了电缆沟结构模型的现状和应用中出现的问题。在设计手册的基础上提出了电缆沟新结构模型,并进行了技术经济比较,提出了电缆沟结构模型不同导致用途的不同。     

拉西瓦水电站地下厂房顶拱1 500 kN预应力锚索设计与施工应用

为了保证施工期及运行期地下洞室的稳定,根据地质条件在拉西瓦水电站地下厂房顶拱施工中采用了1 500 kN无粘结预应力锚索加固,其主要内容包括预应力锚索的设计、钻孔、锚索制安、灌浆、垫座及外锚头混凝土浇筑、张拉。阐述了大型地下洞室在不良地质下采用预应力锚索加固的必要性和重要性。     

Experimental study of thermal field deriving from an underground electrical power cable buried in non-homogeneous soils

The electrical cables ampacity mainly depends on the cable system operation temperature. To achieve a better cable utilization and reduce the conservativeness typically employed in buried cable design, an accurate evaluation of the heat dissipation through the cables and the surrounding soil is important. In the traditional method adopted by the International Electrotechnical Commission (IEC) and the Institute of Electrical and Electronics Engineers (IEEE) for the computation of the thermal resistance between an existing underground cable system and the external environment, it is still assumed that the soil is homogeneous and has uniform thermal conductivity. Numerical studies have been conducted to predict the temperature distribution around the cable for various configurations and thermal properties of the soil. The paper presents an experimental study conducted on a scale model to investigate the heat transfer of a buried cable, with different geometrical configurations and thermal properties of the soil, and to validate a simplified model proposed by the authors in 2012 for the calculation of the thermal resistance between the underground pipe or electrical cable and the ground surface, in cases where the filling of the trench is filled with layers of materials with different thermal properties. Results show that experimental data are in good agreement with the numerical ones.     

Piezoelectric cable macro‐fiber composites for use in energy harvesting

Piezoelectric cable is a commercial electronic sensor that incorporates the piezoelectric polymer polyvinylidene fluoride. This paper investigated a potential application of piezoelectric cable for energy harvesting. A method for testing the electrical output using the tensile load was developed and used to determine the output properties of the cable. A design for a piezoelectric cable fiber composite is presented, along with recommendations for potential applications and further research. Copyright © 2014 John Wiley & Sons, Ltd.     

电缆故障报警自动定位系统设计与实现

鉴于电缆的应用越来越广泛,电缆故障的种类越来越多,故障发生的频率也越来越高。本文对于频发的电信电缆中断事故,本文提出了一种电缆故障自动报警定位系统的设计方案。系统采用电容检测法和电阻检测法相结合,根据定期测得的单位长度电容、电阻值,测算出故障电缆长度。实验和应用结果表明,系统结构紧凑、功能齐全、使用简单易学、测量精度高、无误报、成本低廉。     

长距离跨桥高压电缆的关键技术设计

在跨海大桥上敷设电力电缆不仅能够起到安全、可靠、经济地输送电能的目的,还能解决许多岛屿采用独立小发电系统,其发电成本高、可靠性低、环保效果差等问题。结合目前现有的桥梁上敷设电缆的设计经验,介绍了在进行桥梁上敷设高压电缆时在电缆热伸缩、桥梁伸缩与振动、电缆空间布置及电缆与其他管线相互影响等方面的关键技术设计,可对今后桥梁电缆的施工、运行提供借鉴。     

220 kV高压单芯电缆同相并联输电方案分析

针对实际工程需要,探讨了在220 kV高压输电领域采用同相并联电缆输电的方案.应用PSCAD/EMTDC仿真软件计算了4种同相2根并联电缆排列方式下的电流分配和不平衡系数,推荐了几种同相电流分配最均匀、不平衡系数最小的排列方式,对电缆线路工程设计提供技术支撑.同时,针对同相并联电缆的输电方式,在变电站GIS布置方式、继电保护及系统通信设计方面给出了建议.     

基于混合模式的三维-GIS电力电缆信息管理系统

在对电力电缆运行方式、信息管理模式进行了调研的基础上,针对地区电力局电力电缆运行管理的现状,综合考虑了电力电缆网络分布兼具运行属性和地理空间属性的特点,提出了基于全新构架的B/S和C/S混合模式的三维地理电缆信息管理系统的总体开发方案。实现了对电力电缆的空间信息、工程信息的综合管理;可对电缆的运行、维护、检修以及缺陷管理、事故管理等进行全方位的管理。利用该系统来管理电力电缆,可以节约大量的资源,提高工作效率,提高管理质量。