Results 51 to 60 of about 7,022 (168)

影响中压电子式互感器准确度问题的研究

open access: yesGaoya dianqi, 2009
中压电子式电压互感器和电流互感器在试验和运行中暴露出了一系列的问题,笔者主要针对电子式电流互感器的饱和特性以及电子式电压互感器的温度特性进行讨论。非线性励磁特性的电流互感器通常都是由闭合铁心制成的,在大多数情况下,由于在过渡状态中铁心饱和,而使这种电流互感器变换一次电流的周期性分量产生的误差大大超过容许值。同时分析铁心带气隙的电流互感器,总结了铁心有非磁性气隙的特点。介绍了基于电阻分压原理的电子式电压互感器的原理及结构,分析了影响其温度特性的因素 ...
万雄, 张贵新, 王强, 王鹏
doaj  

Identifying potentially suitable and accessible refugia to mitigate impacts of an emerging disease on a rare tree

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Identifying refugia from emerging threats is vital to ensure the persistence of rare and threatened species, but modeling habitat distribution for these species is challenging and the role of people in refuge management is rarely considered. Myrtle rust is an emerging infectious disease that represents a grave threat to the rare wetland tree ...
Sarah M. Herbert   +7 more
wiley   +1 more source

Accounting for human–nature linkages in area‐based conservation monitoring through social–ecological indicator bundles

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract As the coverage of area‐based conservation increases across the globe, it is critical to improve understanding of the social and ecological outcomes of such measures and the pathways to their outcomes. A social–ecological systems approach to monitoring and evaluation is increasingly advocated; yet, applications remain scarce.
Natalie C. Ban   +21 more
wiley   +1 more source

考虑雷电过电压作用的500kV SF6电流互感器故障原因分析

open access: yesGaoya dianqi, 2015
笔者针对一起雷雨天气下2台500 kV SF6电流互感器在65 s内相继发生的主绝缘击穿故障,利用ATP仿真软件搭建了变电站及线路模型,计算了雷电过电压传导至故障电流互感器时的幅值,分析了侵入变电站的雷电过电压对SF6电流互感器故障过程的影响,并根据故障电流互感器的解体检查情况,推导了电流互感器的故障过程,找出了电流互感器故障的根本原因。分析结果表明:侵入变电站的雷电过电压没有将电流互感器直接击穿,但促使已存在绝缘缺陷的电流互感器主绝缘加速劣化 ...
晏年平   +4 more
doaj  

[[alternative]]Development of a Bearingless Switched Reluctance Motor Drive [PDF]

open access: yes
計畫編號:NSC94-2213-E032-028研究期間:200508~200607研究經費:840,000[[abstract]]開關式磁阻馬達運轉時除了會產生磁阻轉矩使轉子與定子極對正外,亦會產生相當大施 加於轉軸的徑向力,由先前的研究知道藉由適當地分配各定子極電流便可以控制轉矩與 徑向力之大小與方向。因此,若馬達所有的定子極電流都獨立控制時,經由調節各極的 電流可以使馬達所產生的徑向力正好抵消轉軸所受的外力,如此不僅可以用於消除馬達 的震動 ...
楊勝明
core   +1 more source

Dynamic adaptive trust evaluation model based on interaction-aware [PDF]

open access: yes, 2012
A dynamic adaptive trust evaluation model was established based on interaction-aware.The historical interaction window and trustworthy recommendation number was introduced in overall trust evaluation method,which overcomes the shortage of traditional ...
Feng LI   +3 more
core  

韓国語感謝場面における応答ストラテジー -釜山地域の大学生を中心に- [PDF]

open access: yes, 2020
When a person feels indebted, expressions of gratitude are performed in an effort toreadjust the balance in the relationship between the interlocutors; they employ linguisticstrategies to deliver their feelings in the appropriate ways to fit the norms or
呉 恵卿, 金 明煕
core   +1 more source

不同原理的保护用电流互感器暂态特性对比分析

open access: yesGaoya dianqi, 2018
在现代智能电网的智能化变电站中,电子式电流互感器逐渐取代传统的电磁式电流互感器,得到越来越广泛的应用。暂态特性是保护用电流互感器的重要性能,文中针对不同原理的电流互感器的暂态特性进行了相关的试验研究。首先概述了电磁式电流互感器的暂态保护TPY级和电子式电流互感器暂态保护TPE级的定义及试验要求,然后通过实际的试验,对不同原理的多台电流互感器的暂态特性进行比对,得到多组比对试验数据。试验结果表明:电子式和传统电磁式的电流互感器都能达到标准要求的暂态性能指标,对用户的选型及生产厂家的设计均有指导意义。
杨忠州   +8 more
doaj  

铁磁谐振下动车组电压互感器温升特性研究

open access: yesDianci bileiqi
动车组在过分相时,车载电压互感器容易发生铁磁谐振,严重时甚至导致互感器炸裂损毁,威胁行车安全。本研究结合某型动车组电压互感器实际参数,建立了动车组电压互感器等效三维模型。利用传热学原理,基于多层圆筒壁模型计算分析等效热传导系数和等效比热容等参数。通过实验测量动车组电压互感器励磁特性曲线,结合动车组电压互感器励磁特性曲线和实际工况,计算发生铁磁谐振时绕组和铁芯的发热功率。通过对动车组电压互感器进行热仿真,得到动车组电压互感器的温度场,研究发生铁磁谐振时动车组电压互感器的温升 ...
朱蕴奇   +3 more
doaj  

采用红外热像仪探测电磁式电压互感器内部热故障

open access: yesGaoya dianqi, 2000
对运行中发热的一相电磁式电压互感器进行了测试、计算和分析,找出了引起该相互感器发热的原因。进一步对该型互感器介损发热的温升值进行了估算 ...
游一捷, 黄继, 刘乃桓, 欧志敏
doaj  

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