Results 31 to 40 of about 8,591 (156)
Gaoya dianqi, 2020 高压直流断路器是多端直流输电及高压直流系统联网的基础和安全保障,它不仅要能够开断短路电流而且要能够开断小负载电流,实现对高压直流系统的保护及控制功能。文中在振荡回路中对机械式高压直流断路器开断大电流及小电流的性能进行了测试。分别测试机械式高压直流断路器开断17.5 kA和开断50 A电流时的恢复电压值和恢复电压变化率。在试验中发现机械式高压直流断路器开断17.5 kA电流时可以在叠加高频振荡电流后的第1次过零点处开断,但是在开断50 A电流时需要在第2次电流过零点处才能开断。开断50 ...
高俊珍 +4 more
doaj
Design and Implementation of Online Monitoring System for HVDC Breaker Based on GPRS and PAC [PDF]
, 2014 近年来随着我国坚强智能电网的快速建设和发展，越来越多的系统应用环节需要使用远程在线监控技术，人们对远程监控的实时性、可靠性和功耗的要求也越来越严格。高压直流开关作为高压直流输电网络中的重要组成部分，对它的各项基本参数和运行状态参数的测量也一直是直流输电技术的研究难点之一，主要原因在于：（1）信号采集困难：它是高压设备，作用时会释放巨大的能量；（2）信号传输困难：设备处于高压运行环境，与地面存在较大的绝缘间隔，无法使用有线通讯传输方式；（3）参数无法直接获得：设备自身没有相应的信号传感设备 ...
许登华
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photodetectors, based on GaAs nanowires (NWs), hold significant promise in the fields of high integration micro‐ and nano‐optoelectronics applications because of their outstanding electronic and optical properties. To date, significant efforts have been directed toward enhancing the performance of photodetectors, aiming for high detectivity ...
Yu Hao +11 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 5, Page 621-630, November 2025.ABSTRACT Objectives To compare the maternal hemodynamics of Chinese women at low and at high risk for preterm pre‐eclampsia (PE) and assess the differences in hemodynamic parameters between high‐risk women with or without prophylactic aspirin. Methods This was a prospective longitudinal case–control study of 857 Chinese women with a singleton pregnancy
X. Wang +11 more
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Teaching Translation for Electric Power English From the Perspective of Relevance Theory: Belt and Road Initiative and Electric Power Education [PDF]
, 2018 With the continuous development of the Belt and Road international cooperation of electric power, companies related to electric power develop overseas markets and invest overseas electric power projects.
CHEN, Rui, ZHAO, Yushan
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Integrative Conservation, Volume 4, Issue 3, Page 405-415, September 2025.Assessing the genetic diversity of edible insects harvested from the wild is a pre‐requisite for designing conservation and management policies. The caterpillars of Gynanisa maja (Saturniidae) are harvested in large numbers in mopane woodlands in southern Africa, where they represent a seasonal source of income and nutrition to many rural communities ...
Zwannda Nethavhani +3 more
wiley +1 more source
Gaoya dianqi, 2003 在最近20年内高压直流晶闸管阀和高压直流输电技术的发展,使得用高压直流输电更经济、更可靠。越来越多的输电线路使用高压直流进行电力传输。现代的高压直流晶闸管阀以组件式结构、大功率和水冷晶闸管、智能晶闸管控制单元、全面的计算机阀控制和严格的试验为特征。容性换流技术、数字式光纤互感器、有源直流滤波器和连续可调交流滤波器的使用,有效地提高了高压直流输电的质量,产生了更健全的高压直流输电系统。作为新一代高压直流换流器的电压控制型换流器,使得小容量电力传输经济可行。
盛宝良 +4 more
doaj
Gaoya dianqi, 2015 高压直流（HVDC）电网是解决可再生能源大规模接入的重要途径,而高压直流断路器（HVDC CB）是直流电网发展的瓶颈问题。笔者针对高压直流输电技术的发展趋势,分析了高压直流电网对高压直流断路器的需求;介绍了各种直流开断方法的基本原理,并分析了其在高压直流电网中应用的可行性;着重介绍了混合式高压直流断路器和基于人工过零的高压直流断路器的研究和发展现状,对其开断过程进行了较为详细的分析,并对其进一步的研究中的关键问题给出了建议。
史宗谦, 贾申利
doaj
The Design and Experiments on the High Voltage Supplier for Electrohydrodynamic Direct-Writing [PDF]
, 2012 作为一种新型的喷墨打印技术，电纺直写不需要对模版进行曝光，且具有控制简便、制造速度快等优点，因此，电纺直写在柔性电子和微纳系统集成制作中显示出巨大的发展潜力。高压直流电源输出电压的稳定性是电纺直写微纳米结构均匀性和沉积定位精确度的重要影响因素，而集成化、低成本电纺直写高压电源开发已成为电纺直写技术产业化应用的关键。论文主要针对电纺直写需求开展高压直流电源的设计制作，并基于此电源展开纳米纤维、微纳液滴及微米薄膜等多种微纳喷印制造。 电纺直写具有高电压、低电流、低功率的特点 ...
陈艺慧
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