架空送电线路导地线应力配合临界档距计算

通过对架空线路导地线应力配合计算分析，提出应力配合临界档距新概念，能够正确判别和计算地线最大使用应力，保证导地线之间的距离满足规定要求。     

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。     

架空输电线路导、地线微风振动成因和防控措施探讨

为减少振动对导、地线及金具的危害,电力工作者做了大量的研究工作,迄今为止,规程规范及有关技术文件规定的防振措施(除明确说明针对舞动、次档距振动的除外)都是对微风振动而言,对舞动、次档距振动的控制和预防尚未有很好的解决方案.就微风振动的成因及其危害进行分析和阐述,对普通线路和大跨越线路的防振措施和动弯应变极限值进行了分析比较,提出了防止或减轻导、地线振动的措施、线路防振装置在运行中的要求和注意事项,并针对大跨越线路的测振提出建议.     

地线复合光缆OPGW在高压送电线路中的设计选择

随着电力事业的发展,为了满足电力生产调度、电力系统自动化对通道的需求,同时可为邮电系统提供服务、增加效益,OPGW已广泛地应用在高压架空送电线路中,它不仅可起到架空地线的作用,同时也兼顾了光纤通信的功能。本文着重介绍OPGW在送电线路中的设计及选择。     

架空线路导地线斜距的检验

本文根据现行规程对导地线15℃无风时档距中央之间距S的三个检验公式进行探讨,并阐明导地线重力比差(C)和杆塔控制档距(l_n)的基本概念,简介检验导地线斜距S的图算法,以供线路设计的参考。     

具有避雷线及耦合地线的送电线路耐雷水平计算方法的商榷

本文推导出具有避雷浅及耦合地线的送电线路耐雷水平的计算公式。     

探讨输变电线路导地线压连接的技术

电力线路是电力系统的组成部分,担负着输送和分配电能的任务。根据输送距离和输送容量的大小。输电线路导地线连接的可靠性和稳定性关系着设备能否长期运行的安全保障。因此,确定导地线连接的工艺,常见的压接技术主要有三种,爆破压接法、机械钳压链接法、液压连接法,要根据实际工程中选择合理的压接方法,做到充分考虑电网的安全,合理地选用连接工艺,保证设备正常经济的运行,减少不必要的经济损失。     

鸟害引起输电线路地线断线的原因分析及对策

目前因人类经济活动频繁,破坏了鸟类的原栖息地,鸟类在输电线路杆塔构筑鸟巢有增加的趋势。通过对广东东莞110kV立良线一起鸟害引起的输电线路地线断线事故的探析,指出目前输电线路在设计、运行中存在的不足之处和潜在的安全隐患,并提出若干防止类似事故的对策。     

500 kV输电线路导、地线大面积损伤补修新技术

采用补修新技术补修损伤导线比切断重接或换线等方法有许多优点，加长型补修管的研制通过了科技成果监定，满足了设计要求，而且在实际生产运行中可靠应用。     

浅谈掏挖式基础在输电线路上的运用

提出了一种新的输电线路基础型式－掏挖式基础,讨论了该基础型式的受力特点,并与传统的板式基础和阶梯式基础比较,得出：基于广东省的地质条件,掏挖式基础适于广东省大多数输电线路的塔基,工结构合理,可减少基础土石方开挖工程量,节省钢筋和混凝土的,降低工程造价。广东省５００ｋＶ蓄增Ⅱ输电线路的部分塔基首次采用了掏挖式基础,线路已投运一年多,运行稳定。     

Review of the maximum efficiency of transmission lines

The problem of maximum efficiency of power transmission lines, solved earlier by the author, is reviewed, clarified, and completed through a detailed analysis of the mathematical properties and physical characteristics involved. The results are presented in a form useful to teachers, students, and practicing engineers in electrical power     

Impact of distributed generation on protection of single wire earth return lines

Distributed generation (DG) inclusion within the grid system potentially introduces problems related to control, protection, harmonics, and network transients. This paper analyses one of the key issues: protection of the network, by ascertaining the impact of rotary DG inclusion on existing protection system of SWER (single wire earth return) lines and the DG sensitivity during faults. The analysis is carried out by estimating fault-sensitivity for the worst-case situation, determining the DG impact on the existing protection scheme, and comparing the network situation with and without DG during the fault. A model of arc voltage is used to represent a fault on a SWER scheme. The size of DG is selected based on the SWER capacity and SWER load. The study is conducted on an example SWER system by considering the SWER lines with and without DG and faults on the SWER backbone and laterals, and simulation results are reported. In every case studied, the fault current from the DG significantly exceeded the DG rating and the DG would have tripped. Thus the system reverts to the case with no DG. Even if DG did not trip, the fault current from the source would be largely independent of the DG, and thus the original feeder protection would continue to provide the same quality of performance. Hence, net sensitivity and existing protection system will not be adversely affected by DG inclusion in SWER lines.     

高压输电线路导线温度在线检测系统设计

针对输电线路导线温度对导线载流量的影响,输电能力的下降,设计了一种基于单片机的导线温度在线检测系统,并阐述了该系统的硬件电路结构以及软件结构,测试了该系统的监测效果.     

输电线路智能带电检修关键技术研究综述

采用智能装备代替人工进行带电检修,可保障带电作业人员安全,如何在不同应用场景下安全、可靠、高效地完成带电检修是其关键问题.首先介绍了架空线路、电力电缆、气体绝缘输电线路(GIL)这3类线路的运行环境和带电检修需求,分析了电力无人机、架空线路机器人、绝缘子机器人、车载机器人、电缆机器人、GIL检修机器人6种智能装备的应用...     

基于二阶B样条小波模极大值的双极HVDC输电线路行波保护

针对行波保护存在波头难以捕捉或捕捉精度不高的问题,提出了一种基于二阶B样条小波模极大值的双极HVDC输电线路行波保护。首先,获取正负极整流逆变两端的暂态电流行波信息,通过计算其相关系数选出故障极,然后利用二阶B样条小波函数分解暂态电流行波获得模极大值,通过比较电流行波与小波模极大值的极性判断出区内外故障,最后根据模极大值所在位置确定波头到达时间进行故障测距。PSCAD/EMTDC仿真结果证明,所提办法可准确的实现故障的判别,测距精准度高且不易被过渡阻抗、故障类别及测量距离等要素影响。     

Fault location method applied to transmission lines of general configuration

Power quality is an important concern once automation is present in almost all industrial process. Since fault occurrences affects the power quality considerably, in this paper is proposed a new fault location method applied to transmission lines constituted of any configuration, as example double circuit, untransposed sections, and multiple derivations.In order to locate the fault, the method uses voltage and current phasors gathered from terminals with measures, however the method does not need these measures from all terminals.The proposed method is composed of three blocks to locate the fault, which are: Algorithm’s Main Control, Grid Scanning Process, and Objective Function’s Minimization Process.A large number of simulations were conducted and the results show the accuracy and efficiency of the method, even in cases of high impedance faults.     

高压输电线路采用深层垂直接地体的探讨

从降低杆塔接地电阻方面进行探讨,提出应用层垂直接地体来提高输电线路耐雷水平的设想。它是利用深层潮湿土壤的土壤电阻率较低来降低杆塔的接地电阻的,并且有不易受外力破坏、不易氧化锈蚀、钢材消耗量小等优点,广东省中山电风２２０ＫＶ横小线的部分杆塔采用了深层接地形式,测量和统计数据表明,深层接地能降低杆塔接地电阻和线路雷击跳闸率。