Results 41 to 50 of about 11,988 (165)

电力系统及其自动化中变压器故障诊断研究

open access: yes水电科技
本篇文章旨在针对电力系统及其自动化中变压器常见问题展开分析,并通过研究和有效的预防与控制措施,旨在提升变压器的稳定性、安全性和可靠性。鉴于国民经济和科技水平的蓬勃发展,对电力系统的要求也日益提高。本篇文章主要研究电力变压器的常见故障,包括过载、绝缘老化、内部线路损坏等,并提供了一些行之有效的检测手段与预防措施。通过深入分析变压器故障的原因和特征,以及有效的预防与控制措施,旨在降低事故发生的概率,减少不必要的风险,从而确保电力系统的安全稳定运行。
军强 祁
semanticscholar   +1 more source

Janus Nanofiber‐Architected Moisture‐Enabled Power Generator for Intelligent Sensing and Neuromorphic Application

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Moist‐electric generators (MEGs) harness energy from ubiquitous ambient humidity, which has emerged as a promising way to collect energy irrespective of location and time. This study presents a high‐performance MEG employing a bilayer Janus nanofiber membrane: a hydrophilic layer (lithium chloride/citric acid/polyvinyl alcohol) for enhanced ...
Peng Chen   +7 more
wiley   +1 more source

用于纳秒脉冲高压测量的同轴型电容分压器

open access: yesGaoya dianqi, 2008
阐述了电容分压器的电路原理,根据同轴型电容分压器的容值计算公式计算了电容分压器的理论分压比,研制了一种用于测量上升沿小于10 ns脉冲高压的同轴型电容分压器,并利用方波源和电阻分压器对其进行了标定。实验测试表明,该电容分压器满足测量要求,能很好地测量快前沿的陡脉冲电压信号。
刘轩东   +3 more
doaj  

Altered nutrient cycling functionality in seagrass meadows under a simulated future marine heatwave event

open access: yesNew Phytologist, Volume 247, Issue 6, Page 2616-2629, September 2025.
Summary Seagrasses are important contributors to environmental nutrient cycling in marine ecosystems and can improve water quality by absorbing excess nitrogen (N). However, these ecosystems are vulnerable to human‐mediated pressures, including marine heatwaves (MHWs), particularly those of longer duration. We performed an experiment simulating a 30‐d,
Alissa V. Bass   +5 more
wiley   +1 more source

特高压电容分压器宽频无源等效电路建模方法

open access: yesGaoya dianqi, 2017
为了提高特高压电容式电压互感器的瞬态性能,分析其在较宽频域内的分压特性,以某公司生产的1 000 kV特高压电容分压器为实验对象,进行了特高压电容分压器阻抗的测量,建立了特高压电容分压器的宽频等效电路模型。首先,测量特高压电容分压器的阻抗;其次,基于测量得到的数据结合矢量匹配法和电路综合理论,建立了特高压电容分压器的宽频等效电路模型,并利用模式搜索算法对等效电路进行无源修正;最后,利用所建立的模型,分析特高压电容分压器在不同频率下的分压特性,为合理设置均压装置以及改善特高压的制造工艺提供理论依据。
王平, 张广勇, 李慧奇, 李璿
doaj  

基于稀疏自动编码器的特高压变压器可听噪声分析

open access: yesGaoya dianqi, 2020
作为特高压交流变电站内的主要噪声源之一,运行中的特高压变压器的本体噪声、冷却装置噪声及环境噪声等相互混叠,给准确分析特高压变压器的噪声特性带来不利影响。文中依据某1 000 kV交流变电站特高压变压器的噪声测试结果,通过设计阻带滤波器和合理选取稀疏自动编码器的关键参数如隐层节点数、稀疏参数等,提出了一种综合阻带滤波器和稀疏自动编码器的特高压变压器本体噪声提取方法,对比分析了特高压变压器噪声信号分离前后的频谱瀑布图。结果表明:特高压变压器的本体噪声主要集中在100、200、300 Hz分量 ...
田昊洋   +5 more
doaj  

Sanctions and infrastructural ideologies: Assessing the material shaping of EU digital sovereignty in response to the war in Ukraine

open access: yesPolicy &Internet, Volume 16, Issue 4, Page 692-710, December 2024.
Abstract In this paper, we interrogate the sanctions instated against Russian media by the European Union (EU) in response to Russia's aggression in Ukraine. We do this in three ways. First, we present the outcome of extensive network measurements that show the heterogeneous implementation of the sanctions in EU Member States.
Niels ten Oever   +6 more
wiley   +1 more source

高压断路器机械防慢分装置的设计

open access: yesGaoya dianqi, 2018
高压断路器(配液压操动机构)应具有防止液压机构失压后断路器慢分的功能。断路器防慢分措施有两个方面:一方面是液压机构中液压系统的液压防慢分;另一方面是针对断路器的机械防慢分。文中介绍后者。文中介绍了高压断路器机械防慢分装置的设计及试制。对断路器的传动系统进行了分析,论述了断路器机械防慢分装置的结构和动作原理、输出力值及应力和变形量计算,按此方法设计的机械防慢分装置随断路器进行了操作试验验证,确保了断路器没有出现慢分现象。
张全民, 赵玉柱, 张朝辉
doaj  

Rethinking and advancing the movement of resistance, activism, and advocacy in health in four central arenas of the Middle East Region 重新思考和推进中东地区四个中心地区的健康领域中的抵抗、行动主义和倡导 Repensar y avanzar el movimiento de resistencia, activismo y defensa de la salud en cuatro ámbitos centrales de la región de medio oriente

open access: yesWorld Medical &Health Policy, Volume 16, Issue 4, Page 692-708, December 2024.
Abstract The Middle East region has a long history of resistance, activism, and advocacy movements in health, most recently as part of the 2011 region‐wide Arab Spring. Despite this storied history, however, movements of resistance, activism, and advocacy in health in the region are rarely unpacked, examined, or documented.
Mohammed Alkhaldi   +3 more
wiley   +1 more source

电力变压器检修工作中的故障诊断与处理

open access: yes电力工程技术创新, 2019
通过故障诊断和仪器检测及时地排除变压器故障,恢复变压器的工作状态,保证电力系统运行的安全与稳定。论文就电力变压器检修工作中的故障诊断与处理工作进行研究分析。
道钧 何
semanticscholar   +1 more source

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