Results 1 to 10 of about 2,268 (149)
, 2023 针对使用广泛的500 kV架空输电线路，分别研究了在轻、中、重冰区，由断线及不均匀覆冰引起的导线张力对输电杆塔安全性和经济性的影响。研究表明：导线张力增加0～20%，若保持杆塔杆件规格不变，悬垂塔的超限杆件比例为0～51%，耐张塔的超限杆件比例为0～4%；若增大杆塔杆件规格以保证安全，悬垂塔的塔重增加0～28%，耐张塔的塔重增加0～5%；覆冰越厚，由断线引起的导线张力对杆塔影响越小，由不均匀覆冰引起的导线张力对杆塔影响越大；导线张力主要影响悬垂塔横担上、下平面交叉材、塔身主斜材等杆塔杆件。因此 ...
张林枫 +6 more
core +1 more source
Discharge characteristics and discharge simulation model of long air gaps containing a floating conductor [PDF]
, 2022 Long air gaps containing a floating conductor are common insulation types in power grids. During the transmission line live-line work, the process of lineman entering the transmission line air gap constitutes a live-line work combined air gap, which is a
Gao, Jiachen <1995>
core +1 more source
Working manipulator motion optimization of live maintenance robot for high voltage transmission line [PDF]
, 2016 In response to the problems of artificial low-operation efficiency, high labor intensity, high altitude and high risk in drainage board bolt tightening for high voltage transmission line, a bolt tightening live maintenance robot with double arms and ...
FAN Fei +3 more
core +1 more source
Routing algorithm for railway monitoring linear WSN based on improved PSO [PDF]
, 2022 To solve the problems of short network lifetime and large data transmission delay, caused by unbalanced node energy consumption of linear wireless sensor network in railway monitoring scenario, a routing algorithm based on particle swarm optimization ...
Anqi LYU +3 more
core +1 more source
Manipulator dynamic modeling and motion planning for live working robot [PDF]
, 2016 This article is focused on a double-arm and double-manipulator live working robot.The arm motion of the robot for insulator string replacement during the operation process was decomposed.The basic operation dynamic model was established by the Lagrange ...
JIANG Wei +3 more
core +1 more source
Gaoya dianqi, 2021 同塔混压输电在增大输电容量、节约线路走廊资源和减少建设成本方面具有巨大优越性和发展前景。近年来对于特高压与超高压同塔混合输电开展的前期研究发现,多回输电线路之间存在电磁耦合,影响输电线路的过电压水平。因此需对超、特高压混压输电线路的耐雷水平进行重新评估,以确保输电安全。文中以单回±800 kV与双回500 kV交直流同塔输电线路为研究对象,应用ATP-EMTP软件搭建线路分布式参数模型,并对雷电流、杆塔、波阻抗等分别建立仿真模型,分析了雷电反击与绕击时架空线路上产生的感应过电压特性 ...
曾诚 +4 more
doaj
, 2021 随着中国经济的快速发展，国家越来越重视500kV超高压输电线路运营维护管理工作。为了进一步提升500kV超高压输电线路的管控效率，需要根据实际情况定期或者不定期对其进行故障维护，提升维护与保养的时效性，提升输电线路的实际使用效率。因此，论文主要针对500kV超高压输电线路运营维护管理进行简要分析，并提出合理化建议。
少华 武
core +1 more source
Method and application of carbon emission calculation for ultra-high voltage (UHV) project construction [PDF]
, 2023 [Objective] As one of the seven key areas of “new infrastructure” development during China’s 14th Five-Year Plan period, the ultra-high voltage (UHV) projects are the backbone of China’s new power system and is of great significance to the transmission ...
CHEN Xiaohong, FU Yipeng, HUANG Chengdong, WANG Yangjie
core +1 more source
Dianci bileiqi, 2020 雷击输电线路造成的故障是影响电网安全稳定运行的重要因素,雷电屏蔽性能的评估一直是输电线路设计论证过程中热点问题之一。近年来随着我国特高压工程的大力建设,由雷电屏蔽失效（绕击）引起的特高压输电线路故障频繁发生,特高压输电线路具有杆塔尺寸大、运行电压高、上行先导作用加剧等新特点,继续深入研究输电线路雷电屏蔽性能意义重大,而建立有效的雷击分析模型是准确评估输电线路雷电屏蔽性能的前提和关键。笔者梳理了目前常用的特高压输电线路雷电屏蔽分析方法研究现状及存在的问题,着重阐述了更具物理内涵的先导发展模型法 ...
师伟 +4 more
doaj
Dianci bileiqi, 2022 架空输电线路遭受雷击会出现很高的暂态过电压，国内外学者对输电线路的首次雷击暂态响应作了大量计算，但未见分析考虑后续雷击的影响。为了全面分析雷击对输电线路的影响，建立了考虑后续雷击输电线路模型，采用该模型对线路暂态电位进行了计算；对比分析了其遭受首次雷击和后续雷击两种情况的暂态电位波形。结果表明：绕击时后续雷击在输电线路上产生的雷电过电压比首次雷击高15.14%;过电压上升时间约等于首次雷击的一半，后续雷击输电线路的危害比首次雷击大；雷击杆塔塔顶时，首次雷击比后续雷击在输电线路中所产生的过电压高一倍左右 ...
罗楚楠, 张胜, 黄一威
doaj