DZK－2电脑转速测控仪的应用

ＤＺＫ－２电脑转速测控仪的应用秦豫川（四川电力试验研究院６１００７２）ＡｐｐｌｉｃａｔｉｏｎｏｆＤＺＫ－２ＥｌｅｃｔｒｏｎｉｃＢｒａｉｎＲｅｖｏｌｕｔｉｏｎＳｐｅｅｄＳｅｎｓｉｎｇＣｏｎｔｒｏｌｌｅｒ￥ＱｉｎＹｕｃｈｕａｎ（ＳｉｃｈｕａｎＴｅｓｔ＆Ｒ...     

PULSE-多分析仪系统 B&K3560

ＰＵＬＳＥ－多分析仪系统Ｂ＆Ｋ３５６０一、概论丹麦Ｂ＆Ｋ公司有着悠久的生产噪声、振动测量分析仪器的历史，从七十年代中期进入我国后，２０多年来，它的产品在我国已被越来越多的检测机构、大中型企业、研究所、大学等广泛采用。除用于各类家用电器、机电产品的噪声...     

通用计数器的VXIplug＆play软面板设计

本文介绍ＶＸＩｐｌｕｇ＆ｐｌａｙ软面板设计的要求的设计原则，并利用Ｖｉｓｕａｌ Ｂａｓｉｃ在Ｗｉｎｄｏｗｓ软件平台上开发了符合ＶＸＩｐｌｕｇ＆ｐｌａｙ规范的通用计数器软面板。     

02 数字式电力系统稳定器在火电厂和水电站的应用经验

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联轴器在风力发电机中的应用

本文介绍新疆风能公司达坂城风电场丹麦ＢＯＮＵＳ １５０ｋＷ,德国ＡＮＢＯＮＵＳ４５０ｋＫ和Ｊａｃｏｂｓ ５００ｋＷ风电机联轴器结构特点,为风力发电机开发和应用提供参考。     

高压户外组合式开关设备

本文介绍了几种德国ＡｌｓｔｈｏｍＴ＆Ｄ公司和ＡＢＢ公司开发的由高压元件有机结合而成的新型户外开关设备。     

百家展商云集上海 展示先进电力电工设备及技术

本刊讯　金秋十月是收获的季节,也是商家促销的好时机。第二届上海国际设备及技术展览会暨国际电机工程及电工设备展览会在上海展览中心隆重举行。来自18个国家及地区的150家厂商云集此次展览。德国贸易展览协会(ＡＵＭＡ)和德国电气电子工业总会(ＺＶＥＩ)组织官方展团也参加了展览。此次展会业界巨子ＡＢＢ、阿尔斯通、汽巴精化、中华电力(中国)、Ｃｕｍｍｉｎｓ、ＧＥ动力系统集团、日立、Ｈｕｂｂｅｌｌ、伊索沃尔塔、ＫｌｏｅｃｋｎｅｒＤｅｓｍａ、舍钟默勒、Ｍｏｓｔｒｏ、ＭＴＵ、Ｐｅｔｅｒｓ＆Ｔｈｉｅｄｉｎｇ、诺基亚电容器、Ｎ…     

07 用于超导磁能存贮的新型功率调节系统

０７用于超导磁能存贮的新型功率调节系统＝Ａｎｅｗｐｏｗｅｒ－ｃｏｎｄｉｔｉｏｎｉｎｇｓｙｓｔｅｍｆｏｒｓｕｐｅｒｃｏｎｄｕｃｔ－ｉｎｇｍａｇｎｅｔｉｃｅｎｅｒｇｙｓｔｏｒａｇｅ［刊，英］ＨａｎＢＭ，ＫａｒａｄｙＧＧＩＥＥＥＴｒａｎｓｏｎＥｎｅｒｇｙＣ...     

甚低负荷下变速驱动装置效益显著

甚低负荷下变速驱动装置效益显著罗瑞·兰得尔ＢｅｎｅｆｉｔｓｏｆＶａｒｉａｂｌｅ－ｓｐｅｅｄＤｒｉｖｅｓＥｍｐｈａｓｉｚｅｄａｔＶｅｒｙＬｏｗＬｏａｄｓ￥ＬａｒｒｙＲａｎｄｅｌ１概述１９９１年底，姜圣迭戈煤气电力公司（ＳＤＧ＆Ｅ）在Ｅｎｃｉｎａ电站３０...     

电磁离合制动器KGD3型控制电源的研究

电磁离合制动器ＫＧＤ３型控制电源的研究解双全，裘昭培，由兰池河北工业大学（３００１３０）ＲｅｓｅａｒｃｈｏｎＫＧＤ３ＣｏｎｔｒｏｌＰｏｗｅｒＳｕｐｐｌｙｏｆＥｌｅｃｔｒｏｍａｇｎｅｔｉｃＢｒａｋｅ￥ＸｉｅＳｈｕａｎｇｑｕａｎ，ｅｔａｌ前言离合制动器在…     

数字T／R模块自动测试系统校准技术研究

数字T／R模块自动测试系统由仪表和信号通道共同完成测试任务,而对于这样测试系统,长期以来基本采用仪表校准来替代系统校准,存在一定问题和认识误区。为了对系统进行全面的校准,提出仪表校准和信号通道校准相结合的方法,阐述了测试系统原位校准过程。通过应用验证,该方法完成对数字T／R模块自动测试系统整体性能的判定,同时对其他测试系统校准也具有参考价值。     

基于GSM短信技术的电网电压监测仪研制

基于全球移动通信系统(GSM)技术的电网电压监测系统由多台短信电压监测仪、GSM网络、IBM-PC586上位机及电压监测统计管理软件4部分组成。介绍了短信电压监测仪的硬件(电压／电流信号的采样、滤波、信号调理、A／D转换、显示、时钟、GSM—Modem接口等)电路及其功能。讨论了GSM通信发送／接收短信息的编码规则与步骤以及短信电压监测仪的短信处理。     

Locating Cable Faults

Results have shown that the most practical approach to locating cable faults consists of a three-step procedure known as the System Approach. By this process various test instruments are employed to first characterize a fault according to its electrical parameters; to next localize the fault to an approximate location by measurements from a terminal; and then to finally locate the fault within that locality by physically tracing for its effect along the cable route. Success is measured in terms of the minimum of time to restore service which in turn is usually a function of the selection and performance of available instrumentation. All of the recognized methods and instruments that can be used in each step of the System Approach are described giving typical features along with the advantages and disadvantages of each method. This information should enable responsible engineers to evaluate the practicality of their own resources for the intended purpose.     

基于LabWindows_CVI的虚拟测试平台研究与开发

本文提出了一种基于虚拟仪器的雷达发射机自动测试系统的研究方案,将虚拟仪器的概念应用到标准仪器的测量控制系统中,通过编程语言LabWindows／CⅥ对标准仪器进行控制。该测控系统采用基于GPIB卡的主从式分布结构。在测控过程中,工控机平台成为控制环节的主节点,通过GPIB电缆连接微波信号源、脉冲信号源、数字示波器、峰值功率计4台标准仪器来进行整个系统的数据信息传递,完成发射机导引头各参数的实时采集、选择性存储、波形打印。     

应用储能系统抑制电力系统低频振荡原理研究

基于线性化等面积法则和小干扰分析方法,提出储能系统抑制电力系统低频振荡的原理和方法.通过对装有储能系统的单机无穷大系统进行理论分析和仿真测试,结果表明储能阻尼控制能够提供系统阻尼,且控制储能系统和电力系统之间的有功功率交换获得阻尼的效果比控制无功功率交换获得阻尼的效果要好的多.     

Piezoelectric microspeakers with high compressive ZnO film and floating electrode

This paper describes micromachined piezoelectric microspeakers that can produce an audible signal supplied from an MP3 player through the use of 5V_peak-to-peak signal amplification circuit modules. The Sound Pressure Level (SPL) of the fabricated microspeakers is higher than that of previous results even though the input voltage is reduced. The success of this technology is based upon two distinct features; one is the use of a high quality compressive ZnO thin film, the other is the implementation of a floating electrode beneath the piezoelectric ZnO film in order to induce more strain in the diaphragm of the microspeaker when two top electrodes are biased with different polarities. A high quality piezoelectric ZnO film is achieved using an Ar/O₂ gas ratio of 4:1, an R.F. power of 1,500W, a substrate temperature of 150°C, and a chamber pressure of 23mTorr. In this condition, the deposited ZnO film shows a compressive residual stress of ?1.3GPa. The fabricated piezoelectric microspeakers were tested over a frequency range of 400Hz to 12kHz with a 5V_peak-to-peak input signal, the maximum SPL of the fabricated microspeakers was shown to be more than 97.2dB at 7.1kHz with a distance of 3mm between the fabricated microspeakers and the reference microphone (B&K type 2,669 and 4,192L).     

信号分析仪中矢量信号分析设计

针对通信信号的矢量分析测试需求，借鉴国外先进仪表的解决方案，在高性能信号分析仪中开发了矢量信号分析功能。首先对输入信号进行超外差变频接收和A/D采样，然后在FPGA中完成高速数字下变频和数据整数倍抽取滤波，最后在上层应用软件中完成高精度数据重采样、宽带时域修正滤波、瞬态分析和前馈数字解调等多域矢量分析，并通过多级方式实现多域测试结果的配置和同步显示。实测结果表明采用本方案设计的矢量信号分析指标优异、配置灵活、测试结果丰富多样。     

基于PCC的交流采样的设计与实现

交流采样是按一定规律对被测信号的瞬时值进行采样,再按一定算法进行数值处理,从而获得所需电量信息的测量方法,可省去电量变送器等硬件设备、减少装置的体积、用软件功能代替其硬件功能、降低了系统成本、提高了实时性、保证了对交流电参量的采集精度和稳定性。应用B&R的2005系列的IP161模块实现交流采样,介绍了硬件设计、工作原理及几项关键技术。     

电厂机组DCS改造

南定电厂机组分布式控制系统DCS(Distributed Control System)的改造范围包括协调控制、锅炉燃烧器管理、顺序控制、数据采集功能、电气控制系统、汽机的数字式电液调节系统及公用系统．涉及机组几乎所有主、辅机设备的控制和回路控制,I／O点数为3263点,系统点全部能在DCS中进行显示、报警、历史数据分析、控制等功能。改造后以显示器监控取代常规仪表,完善监控覆盖面．适度保留主要参数仪表备用,使运行人员可完全通过显示器和鼠标安全、可靠、高效地监控机组的运行和启停。     

Analysis of inter-area oscillations in the South China Interconnected Power System

This paper presents a detailed analysis of low-frequency inter-area oscillations of the South China Interconnected Power System (SCIPS) for the year of 2005 based on the eigenanalysis method. Participation factors and mode shape diagrams of the generators participating the inter-area oscillations are figured out, and locations of PSS are determined accordingly, the parameter setting for the PSS is studied as well. The method of HVDC small signal modulation is applied to enhance the small signal stability of the system; the results are investigated based on the Prony method. The influences of component maintenances in the transmission corridors on the inter-area oscillations are further investigated, and some important conclusions are drawn.