Application of material characterization techniques to electrical forensic analysis

The application of forensic science techniques to electrical equipment failure investigation has not been widely documented in the engineering world. This paper is intended to share an example of using material characterization techniques to support an initial cause determination of an electrical component "failure" event. The resulting conclusion supported the initial cause determination and ruled out the possibility of design deficiencies. Thus, the qualification testing of the equipment was allowed to continue to successful completion.     

Application of polyimide resin to semiconductor devices in Japan

Polyimide resins that have been developed and marketed for semiconductor applications by Japanese companies are reviewed. Test results for devices in which polyimide resins are used as the interlayer insulator, alpha-ray shielding, or buffer coating film are presented. The status of the development of new polyimides for semiconductors is discussed     

火电厂SIS中在线性能计算与分析的应用

介绍了在线性能计算与分析在火电厂厂级监控信息系统(SIS)中的应用情况。基于实时/历史数据库平台上的实时计算引擎，提出厂级、机组级、设备级的性能计算指标及各指标在计算中需注意的问题，并进一步阐述了各指标间的依存关系。同时，对在线性能计算中的实时数据的有效性判断、轴封漏汽流量的计算、湿蒸汽流量与焓的计算等关键问题的处理方法进行详细论述，提出轴封漏汽系数的定义及计算原理、温蒸汽的嵌套式迭代计算方法。文中提出的方法在某900MW机组SIS的实时性能计算与分析中得到了验证，计算结果满足在线性能计算的实时性及精度要求。     

Carbon-Fiber Technology and Its Application to the Electrical Industry in Japan

Compared to the United States and Western Europe, Japan's carbon-fiber industry concentrates its efforts on marketing nonmilitary, industrial applications, such as electrical, automotive, sporting, mechanical, chemical, civil engineering,, and construction applications.     

隔热与阻热技术在日本节能中的发展与应用

在节能减排的背景下,为降低热能损失,隔热与阻热技术的发展越发显现其重要性。分析日本近年来能耗现状与发展隔热阻热技术的必要性,从原理上对隔热阻热技术进行分析,重点介绍隔热与阻热技术在日本节能领域中的应用实例。实例证明,隔热与阻热技术可以很好地节约能源、降低能耗与二氧化碳的排放,值得推广应用。     

火力发电企业能耗评价与考核系统开发

我国火力发电降耗节能具有很大潜力,能耗评价与考核系统是挖掘电厂管理潜能、降低发电能耗的有效工具。在实时耗差分析与绩效考核系统基础上,开发了新的在线能耗评价与绩效系统,从能耗总体评价、能损控制点分析与优化指导、运行绩效考核等环节,全面管理节能运行,促使低能耗发电目标的实现。介绍了系统结构与功能,分析了能源损耗评价方法、节能目标值确定等关键问题,在Windows环境下完成系统开发。系统在某电厂投入试用,已取得初步成效,降耗节能效果明显。     

时频分析在真空热试验测试电缆故障检测中的应用

真空热环境试验是航天器研制过程中必不可缺的实验项目,实验过程中需配置大量测试电缆,因此测试电缆的故障检测具有重要意义。为有效提高对测试电缆故障的定位精度,对小波变换和分数阶傅里叶变换在电缆故障测试中的应用去进行研究。对时域反射测量法和频域反射测量法两种电缆故障检测方法的发射信号进行加噪处理,分别采用相应的时频分析方法对其进行消噪处理。仿真结表明,小波变换和分数阶傅里叶变换具有良好的去噪效果,对提高测试电缆的故障定位精度具有重要意义。     

ANSYS软件在热电池热模拟中的应用

简要介绍了使用ANSYS对热电池进行热模拟的流程,并针对具体的热电池进行了初步分析。通过对比,模拟结果与实测值基本吻合,说明热模拟对电池热设计具有指导意义。     

Application of genetic-based neural networks to thermal unitcommitment

A new approach using genetic algorithms based neural networks and dynamic programming (GANN-DP) to solve power system unit commitment problems is proposed in this paper. A set of feasible generator commitment schedules is first formulated by genetic-enhanced neural networks. These pre-committed schedules are then optimized by the dynamic programming technique. By the proposed approach, learning stagnation is avoided. The neural network stability and accuracy are significantly increased. The computational performance of unit commitment in a power system is therefore highly improved. The proposed method has been tested on a practical Taiwan Power (Taipower) thermal system through the utility data. The results demonstrate the feasibility and practicality of this approach     

热喷涂技术在电力工业中的应用

热喷涂技术作为材料表面强化、保护和尺寸恢复的新技术,在设备维修、机械制造中得到广泛应用,尤其在电厂部件的修复和维护中得到充分体现。对热喷涂技术进行了简单介绍,综述了该技术在电厂锅炉管道、风机、汽轮机、热电偶套管等关键部件的应用状况。电力工业推广应用热喷涂技术,对提高设备使用寿命和设备健康水平,保证安全生产方面具有重大作用。     

火电厂热工自动化安全技术配置若干指导思想

过程工业领域的安全问题正在国际上引起普遍的高度关注，安全仪表系统标准、产品及其应用均有了快速发展。为更好地总结火电厂热工自动化安全技术和经验，必须首先统一安全技术指导思想。讨论了火电厂热工保护设计、分散控制系统（DCS）及其后备监控设备配置和以“开放”的思想引进电控安全技术等3个方面的具体安全技术问题，以期在统一指导思想基础上，对长期以来积累的具体安全技术和经验取得共识。     

火电厂焊接技术发展现状及展望

现代火力发电机组运行参数的提高及其容量的增大，使电厂焊接技术的任务、对象都发生了很大变化，新型耐热钢接头的焊缝金属及热影响区（HAZ）性能严重弱化和异种钢接头的早期失效等问题亟待解决，用于电厂建设和检修的高效、可靠的焊接方法也需进一步开发。本文综述电站耐热钢、异种钢的焊接及高效焊接方法在国内外的研究和应用现状及发展方向。     

火电建设工程环境评价模型的研究

运用模糊数学的理论建立了热电联产型火力发电厂的环境影响评价指标体系,构建了综合评价模型,并对哈尔滨热电有限责任公司2台300MW供热式汽轮发电机组的扩建工程进行了评价,证明该评价模型能够正确反映热电联产型火力发电厂对环境的影响程度,有一定的实用性.     

Application of glass fiber-reinforced plastics to electrical andelectronic apparatus in Japan

Aided by recent developments of component materials, as well as production techniques, glass fiber-reinforced plastics (GFRPs) are finding an increasing number of applications in the electrical and electronic sectors in Japan. In this paper, the focus is on practical applications of GFRPs in such electrical/electronic apparatus as heavy electric apparatus, superconducting/cryogenic apparatus, energy-producing apparatus, spacecraft, communication and broadcasting equipment, home electric appliances, medical apparatus, computers and office automation equipment. Also the characteristics of both thermosetting-type and thermoplastic-type GFRPs are covered, including mechanical, thermal and electrical properties     

超超临界机组汽动给水泵泵轴防抱死调试技术及应用

在超临界及超超临界机组的调试过程中,汽动给水泵泵轴抱死事件屡有发生。而一旦泵轴抱死,只能通过更换芯包或停运检修解决,这直接影响了机组的正常运行。为此,分析了发生汽动给水泵泵轴抱死的主要原因:产品质量,安装质量及汽水品质,针对这些可能的原因提出了有针对性的预控措施,并着重阐述了在调试过程中避免泵轴抱死的运行调试技术措施。将其应用于北仑第一发电有限公司三期工程超超临界机组汽动给水泵调试过程中,收到了良好的效果。该措施对在调试期间防止汽动给水泵泵轴抱死具有一定的指导意义。     

Application of the electrochemical concepts and techniques to amperometric biosensor devices

This review addresses the most salient features concerning amperometric biosensor devices. In a first section, the electrode processes together with the basic principles of amperometric methods currently used in biosensor electrochemistry are described. In the second section, several strategies that combine the control of the electrode surface structure with stable immobilization are examined. The third section presents examples of amperometric biosensors developed for medical or environmental applications.     

Application of sensor integration techniques to switched reluctancemotor drives

A novel drive system for a switched reluctance motor (SRM) is described. Instead of current sensors, the drive uses power MOSFET transistors with integrated pilot devices for current sensing. To compensate for the loss of current feedback when the switches are `off', a fixed off-time chopping strategy is used to control the phase currents. To eliminate the position sensor normally required for SR motor control, the controller estimates the rotor position using phase inductance measurements. The position estimation scheme is sufficiently precise to allow positioning of the phase firing pulses to within approximately two electrical degrees of the desired rotor angle, and full four-quadrant operation of the system is possible. A laboratory prototype system built and tested at speeds up to 3000 r/min shows good performance in all four operating quadrants, including at zero speed. The control is implemented in a single low-cost microprocessor     

Current practice in space charge and polarization profile measurements using thermal techniques

Thermal techniques for probing space charge and electric field distributions in dielectric materials became available approximately 30 years ago. The techniques have reached maturity and they have been employed not only for the primary purpose of electric field or polarization profiling, but also in a wide range of problems posed by materials research. The present survey provides an overview of the historical development, the experimental implementation of the different techniques, the theoretical foundation, methods for the data analysis and a comparison of thermal and acoustic techniques. The thermal wave technique LIMM is used as an example among the thermal techniques, for a discussion of data analysis techniques and for the spatial resolution that can be achieved with thermal wave techniques. A tour d'horizon is provided through recent applications of thermal techniques, in order to demonstrate their capabilities for dielectric material characterisation.     

低压无功就地补偿技术的应用及分析

以并联电容器TBBX0.4 - 系列为主的低压无功就地补偿装置的应用为无功就地补偿技术的推广和应用创造了有利条件 ,也为三相异步电动机的经济运行提供了节能手段。