Results 1 to 10 of about 2,696 (115)

Research on Thermosensitive Coatings for Thermal Runaway Warning in Energy Storage Power Station [PDF]

open access: yes, 2023
[Introduction] Lithium iron phosphate battery storage power plants are an important basis for new power systems to consume large-scale new energy, however, the thermal runaway of battery cells seriously threatens the operational safety of storage power ...
Chaolu NIU   +8 more
core   +1 more source

Discharge characteristics and discharge simulation model of long air gaps containing a floating conductor [PDF]

open access: yes, 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

500kV直流断路器快速机械开关典型故障特性及可靠性提升方法研究 [PDF]

open access: yes, 2023
直流断路器是构建柔性直流电网不可或缺的关键设备。快速机械开关是直流断路器中承载电流、实现快速分合闸、耐受分闸恢复电压的核心组件,其结构复杂、动作速度快、电气应力严酷、可靠性要求高,因而设计研制难度大,任一环节出现问题均会影响直流断路器乃至柔直电网的安全可靠运行。然而,目前快速机械开关由于存在设计选型不合理、工艺管控不严格、试验考核不完善等问题,导致在实际工程应用中故障率较高。针对已应用于张北柔性直流电网试验示范工程的500 kV直流断路器,分析了直流断路器研制、调试 ...
张涛   +4 more
core   +1 more source

Use of carrion fly iDNA metabarcoding to monitor invasive and native mammals

open access: yesConservation Biology, Volume 37, Issue 5, October 2023., 2023
Abstract Severely fragmented habitats increase the risk of extirpation of native mammal populations through isolation, increased edge effects, and predation. Therefore, monitoring the movement of mammal populations through anthropogenically altered landscapes can inform conservation. We used metabarcoding of invertebrate‐derived DNA (iDNA) from carrion
Kristen Fernandes   +5 more
wiley   +1 more source

Contrasting ecological information content in whaling archives with modern cetacean surveys for conservation planning and identification of historical distribution changes

open access: yesConservation Biology, Volume 37, Issue 3, June 2023., 2023
Abstract Many species are restricted to a marginal or suboptimal fraction of their historical range due to anthropogenic impacts, making it hard to interpret their ecological preferences from modern‐day data alone. However, inferring past ecological states is limited by the availability of robust data and biases in historical archives, posing a ...
Tom B. Letessier   +8 more
wiley   +1 more source

零值绝缘子串红外和紫外成像特性试验及耦合场仿真研究

open access: yesGaoya dianqi, 2021
为研究红外及紫外成像技术检测零值绝缘子的有效性,试验采集了不同湿度和污秽度下,零值绝缘子处于绝缘子串不同位置时的红外热像图和紫外视频,分析了绝缘子串的发热、放电特性。利用有限元软件建立了热—电耦合场仿真模型,计算验证了不同条件下绝缘子串的温度及电场分布。研究表明:污秽干燥条件下,绝缘子串不易放电,紫外成像法无法有效检测零值绝缘子,红外热像图显示正常绝缘子的温升明显高于零值绝缘子温升,红外成像法可以有效检测零值绝缘子;污秽湿润条件下,由于高电导率的重污秽以及污秽受潮的不均匀性 ...
王胜辉   +4 more
doaj  

环境条件对基于无人机红外检测的零值绝缘子检测判据的影响研究

open access: yesDianci bileiqi, 2023
随着红外测量技术的不断进步,对绝缘子状态进行红外热像检测逐步应用于电网的日常巡检中,但测量结果受环境因素影响显著。以输电线路现场运行中瓷绝缘子作为研究对象,分别在不同光照强度、湿度、温度与风速下采集绝缘子的红外图像,研究环境因素对绝缘子红外检测的影响规律。研究结果表明,当采用基于绝缘子串温度曲线的判别方法时,光照强度容易引起零值绝缘子的误判,温度变化对零值绝缘子检测没有影响;湿度变化会影响绝缘子钢帽的温升;在强风条件下,各绝缘子钢帽温度相同,不适合进行绝缘子红外检测。研究成果可用于指导电网红外巡检工作 ...
尹林   +9 more
doaj  

一起污闪跳闸事故分析及应对措施

open access: yes, 2020
论文分析了某 110kV 变电站污闪跳闸事故经过、处理过程和事故后保护动作,基于影响污闪的主要因素和变电站设备外绝缘污秽等级配置两方面,分析了造成该变电站污闪事故产生的原因,并针对预防污闪技术方面和管理方面提出了一些改进措施。
培云 李
core   +1 more source

±800 kV直流高速开关断口外绝缘特性仿真研究

open access: yesGaoya dianqi, 2023
直流高速开关(high speed switch,HSS)作为多端柔性直流输电系统的关键设备,其可靠性具有重要意义,而断口外绝缘特性是影响HSS安全稳定运行的重要因素。文中采用有限元法针对HSS实际运行工况进行建模仿真,根据断口内绝缘及外绝缘的电场分布获得最恶劣的运行工况,研究该运行工况下HSS断口外绝缘在淋雨与污秽等环境下的电场分布特性,分析有限空间内断口加长提高外绝缘性能的可靠性。研究结果表明:实际运行过程中,HSS一侧隔离开关拒动、一侧通过阀侧接地为最恶劣的运行工况,在该运行工况下 ...
张长虹   +7 more
doaj  

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