35 kV干式空心并联电抗器故障简析

结合干式空心并联电抗器的结构,介绍了两起500 kV变电站35 kV干式空心并联电抗器故障检查及处理情况。通过对干式空心并联电抗器的解体检查、故障录波图和相关试验数据分析,确定了两起干式空心并联电抗器故障的原因,并根据网内干式空心电抗器实际运行情况,提出了相应的维护建议。     

分级式高压可控并联电抗器微机在高压电网中的运用

分级式高压可控并联电抗器微机在高压电网中的应用越来越广泛,现就其版型、高压电网应用中仿真实例及特性、在高压电网中的控制原理、分级式可控无源滤波器工作原理4个方面进行了分析探讨。     

高压线路并联电抗补偿特性及分析

随着电力系统的发展,装机容量的不断增加,高压输电线路电压等级不断提高,输电距离不断增加,从而引起电力系统电容电流以及容性无功功率的增长,导致电网电压偏高,分析了500kV输电系统并联电抗器的补偿特性,阐述了500kV并联电抗器开断的过电压及限制措施,并联电抗器对高压线路进行无功补偿的作用﹑意义,对电力系统的影响,以及并联电抗器的特性和作用。     

可控电抗器在特高压输电系统中的应用

分析了我国发展特高压输电的必要性，介绍了可控电抗器在特高压输电系统中的优异性能。可控电抗器能够随着传输功率的变化而自动平滑地调节本身的容量．因而能显著改善电网的无功补偿．减少电网损耗和提高输电质量。论文还介绍了两种最具应用前景的特高压可控电抗器的结构与功能。     

分析干式铁心并联电抗器气隙分布对损耗的影响

本文将分析干式铁心并联电抗器气隙的价值,阐述干式铁心并联电抗器运行中所产生的损耗,最终结合实际探究干式铁心并联电抗器气隙对损耗的主要影响,旨在保证电网能够稳定运行,提高供电的质量,满足人们生产、生活的用电需求。     

各类保护装置故障录波报告电子化采集及远程提取系统

电力系统故障录波信息是分析电网事故、异常和继电保护动作行为的关键依据。随着智能电网的大力建设,电力系统对其要求也越来越高,它们不仅是分析故障原因、检验继电保护动作行为的依据,也为电力工作者研究了解复杂系统的真实行为,发现其规律提供了宝贵的资料。目前,故障录波报告的提取是通过纸质打印一种方法。基于故障录波数据的重要性及规范生产标准化,实现对故障录波数据的电子化下载、读识和保存成为必然趋势。故障录波数据的电子下载是一种相对独立、实用、可靠、快捷便利的故障录波提取方法。故障录波数据的电子化既可以弥补纸质报告的诸多不足,同时在远程应用、技术支持等方面有极大的优势。     

基于谐波分析的高压并联电容器组保护研究

随着电力系统负荷的快速增长和电力电子化装置的大量应用,电力系统中产生了大量的高次谐波,干扰了电网的正常运行。与此同时,谐波对并联电容器组中的电容器及串联电抗器也会造成过热故障频发的现象。现通过分析电力系统中谐波对电容器及串联电抗器温升的影响,提出了新型的谐波超温保护策略,并研发了谐波保护装置,保障了高压并联电容器组及电抗器的安全稳定运行。     

基于高精度GPS时钟的新型故障录波装置

文章介绍了一种新型线路故障录波装置。针对现有故障录波设备的不足之处,设计了高精度GPS时钟,为电网的全局分析提供了基础;并采用行波测距,提高了测距精度;最后利用小波变换技术进行数据压缩,保证了录波数据的及时快速上传。现场运行情况表明,所设计的故障录波系统能可靠地记录故障数据,并能准确地进行测距。     

油气在线监测系统在超高压并联电抗器中的应用

为弥补定期油色谱试验时间间隔过长的不足，在一定程度上减少高压并联电抗器突发性事故的发生，主要介绍了油气在线监测系统在超高压并联电抗器中的应用情况。     

基于TMS320F2812的船舶电网短路电流自动录波软件设计与实现

针对船舶直流幅压电网短路故障电流上升率高、幅值大的特点,对一种结合电流上升率和电流幅值的短路故障判据算法进行了研究,提出了一种基于TMS320F2812 DSP处理器平台的短路电流自动录波软件设计方案,对录波软件的工程实现方法、工作流程和通信协议设计等作了重点说明,利用脉冲功率发生器测试电路对录波软件的效能进行了测试.研究结果表明,该录波软件能够实现短路故障电流自动检测及短路全过程电流波形自动记录且实时性强,能为船舶电网事故后分析提供重要的数据.     

Time lapse video microscopy using an animation control unit

A system for time lapse video microscopy incorporating an edit recorder and animation control unit is described, allowing both colour recording, forward and reverse playback without synchrony bars, and the identification of each individual frame recorded. This is achieved by using the edit recorder, controlled by the animation unit to produce continuous series of insert edits using the preroll facility of the recorder. A feature of this system is the preview of the last hour' s recording which is constantly played as the preroll of the edit recorder. Tissue culture flasks modified for stable focus are also described.     

磁栅位移传感器在步进电机控制系统中的应用

介绍了磁栅位移传感器的结构及其工作原理,详述了磁栅传感器在塑壳式断路器智能测控系统中的应用,由步进电机、磁栅位移传感器、西门子PLC组成的控制系统实现了对步进电机的闭环控制,提高了步进电机的控制精度,降低了控制系统的成本,在现场中取得了良好的控制效果.     

基于达芬奇的运动目标检测系统

针对视频监控领域,利用达芬奇双核(ARM+DSP)处理芯片DM6446的高处理性能,设计了运动目标检测系统。在系统硬件上围绕DM6446进行了设计和实现;在用户软件上实现了视频的录制、存储、回放和运动目标检测等功能。ARM核应用程序采用多线程设计,DSP核运行目标检测算法。算法采用改进的颜色直方图方法,利用高斯模型计算颜色的背景概率,通过比较背景和前景的概率,达到了运动目标检测的目的。测试结果表明,算法简单可行,具有实时性,且软硬件工作良好,能够满足实时采集与图像处理的要求。     

Passive vibration damping enhancement of piezoelectric shunt damping system using optimization approach

Piezoelectric materials can be used for structural damping because of their ability to efficiently transform mechanical energy to electrical energy and vice versa. The electrical energy may be dissipated through a connected load resistance. In this paper, a new optimization technique for the optimal piezoelectric shunt damping system is investigated in order to search for the optimal shunt electrical components of the shunt damping circuit connected to the piezoelectric patch on a vibrating structure for the structural vibration suppression of several modes. The vibration suppression optimization technique is based on the idea of using the piezoelectric shunt damping system, the integrated p-version finite element method (p-version FEM), and the particle swarm optimization algorithm (PSOA). The optimal shunt electrical components for the piezoelectric shunt damping system are then determined by wholly minimizing the objective function, which is defined as the sum of the average vibration velocity over a frequency range of interest. Moreover, the optimization technique is performed by also taking into account the inherent mechanical damping of the controlled structure with the piezoelectric patch. To numerically evaluate the multiple-mode damping capability by the optimal shunting damper, an integrated p-version FEM for the beam with the shunt damping system is modeled and developed by MATLAB. Finally, the structural damping performance of the optimal shunt damping system is demonstrated numerically and experimentally with respect to the beam. The simulated result shows a good agreement with that of the experimental result. This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin Jin-Young Jeon received his Ph.D. degree in Mechanical and Aerospace Engineering from Tokyo Institute of Technology in 2005. Dr. Jeon is currently a senior engineer at Digital Printing Division, Digital Media & Communications Business at Samsung Electronics Co., Ltd., Korea. His research interests are the areas of structural-acoustic optimization, sound quality, motion quality, and vibration control.     

便携式OLED屏幕播放系统

本文阐述一种电子显示播放系统,具体地说是一种便携式OLED屏幕播放系统。以克服固定式屏幕播放系统存在的使用局限性,扩大电子屏幕的应用场合。     

Low-cost image-capture system for a scanning electron microscope

We describe a PC-based active-capture system for recording digital images from a scanning electron microscope. The system is based on a National Instruments data-acquisition board and a Pentium computer, controlled by software that we have written in Visual Basic.     

电网继电保护系统终端智能运维验收设备研究

由于终端智能运维验收设备网损率较高,导致电网继电保护系统验收精度较低,对此,研究一种电网继电保护系统终端智能运维验收设备验收方法。基于DS证据理论的多源信息融合方法,去除电网继电保护系统保护下的电网运行冗余数据,获取有效电网运行风险数据;应用风险数据评估继电保护风险度,验收电网继电保护系统的继电保护效果。使用针对电网稳定性的测试系统RTS-79,测试该方法验收有效性与应用性能,结果表明:该方法对电网继电保护系统保护效果的验收精度极高,且电网运行的网损率得以降低,验收耗时控制在60s左右,降低幅度较大,该方法可优化电网继电保护系统终端智能运维验收设备的验收精度与验收效率。     

模拟板件测试系统数据回放软件的设计与实现

模拟板件测试系统是对核电站组成仪表和控制系统（I＆C）的功能板件进行检修和维护而开发的测试平台。可同时对其13类62块板件功能板件同时测试。测试过程中采集到的数据以Tdms的格式存储在上位机数据库中。这些采集数据需要以合适的数据回放软件来显示和处理才能得到有用的板件测试信息。本软件选用LabVIEW为开发工具,从实际应用出发设计了整定回放、故障信息显示、测试板件动态参数求取、全程回放、生成报表等多种功能。经现场试验实测运行效果良好。全面有效的提取了测试板件相关信息。     

Analysis and diagnostics of the human cardiovascular system using the principles of nonlinear wave mechanics

A comprehensive approach to studying nonlinear wave processes in the human cardiovascular system is overviewed based on the combination of high-precision methods for pulse wave measurements, mathematical analysis methods for empirical data, and direct numerical simulation of hemodynamic processes in the arterial tree. Combined application of high-precision recording devices and the developed mathematical apparatus is the basis for creating effective a new generation functional diagnostic base.