Results 111 to 120 of about 13,073 (198)
基于电流零点直流分量的中压断路器T100a试验TRV参数计算
Gaoya dianqi, 2018 电力系统中高压交流断路器开断非对称短路电流后,电流过零点的直流分量控制着随后的暂态恢复电压（TRV）,国家标准《GB 1984—2014高压交流断路器》附录P给出了应用电流零点直流分量的首开极TRV参数的计算方法。大容量试验站在进行中压断路器非对称短路开断试验（T100a）时,通常为三相直接试验,首开极系数为1.5,且TRV具有两参数特征。文中在分析与讨论《GB 1984—2014高压交流断路器》的基础上,研究了满足标准规定的T100a试验时3次有效操作中首开大半波和延长大半波情况下 ...
杨为 +7 more
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Noncontact Multiperson Respiratory Detection Method Based on Blind Source Separation [PDF]
In recent years, there has been an increasing interest in respiratory monitoring in multiperson environments and simultaneous monitoring of the health status of multiple people.
Heng ZHAO +4 more
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U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar [PDF]
Amidst the global aging trend and a growing emphasis on healthy living, there is an increased demand for unobtrusive home health monitoring systems. However, the current mainstream detection methods in this regard suffer from low privacy trust, poor ...
Heng ZHAO +4 more
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Gaoya dianqi, 2012 针对预防性试验中发现的某变电站220 kV线路避雷器直流泄漏电流超标的问题,笔者详细介绍了现场测量直流泄漏电流的影响因素,分析直流泄漏电流超标的原因,得出某变电站220 kV线路避雷器直流泄漏电流超标的主要原因是避雷器部分电阻阀片的直流参数发生变化所导致的。通过现场试验和制造厂解体检测分析,为避雷器缺陷分析提供宝贵的经验。
陈坤汉, 李顺尧
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A Review of UWB Radar Detection of Respiration and Heartbeat Signals in Different Scenarios [PDF]
Due to their many advantages, such as simple structure, low transmission power, strong penetration capability, high resolution, and high transmission speed, UWB (Ultra-WideBand) radars have been widely used for detecting life information in various ...
Bo ZHOU +6 more
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Gaoya dianqi, 2011 直流电阻分压器的散热问题是制约其长期运行可靠性、测量精度的关键因素之一,尤其在分压器工作电流较高时。笔者通过实验及仿真分析相结合的方法,找到了一种解决方案。设计了一种以高导热系数的固体物质为绝缘介质的直流分压器结构,进行了温度场的计算和温度测量试验。该设计为开发直流电子式电压互感器产品提供了基础。
刘彬, 黄德祥
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Gaoya dianqi, 2008 为了提高XLPE电缆直流法在线监测的测量精度,需对微弱直流信号进行测量。笔者介绍了XLPE电缆直流法在线监测系统中微弱直流信号测量电路的设计方案,分析和比较了几种初级放大电路的性能,研究了测量电路中的几个关键模块设计。试验结果表明,该测量电路的设计方案可以较精确地测量约为1nA的直流信号,平均误差约为2%,能够满足监测系统对信号的精度要求。
赵勇, 郭亮, 成永红
doaj
Soft tissue elasticity by ultrasound-based measurement of shear wave propagation [PDF]
, 2016 2011-2012 > Academic research: refereed > Publication in refereed journalVersion of ...
Huang, YP, Zheng, YP
core