基于集成原理的馈线异相短路保护

传统的保护,安全自动装置及其完全独立的整定原则,已经不能更好的适应系统发展的要求,在很多情况下甚至是造成系统崩溃的助力.本文在分析牵引网馈线异相故障的基础上,分析了集成保护在馈线异相短路故障中的应用,能更好的实施针对异相短路故障的保护.     

Architectures for efficient electrophosphorescent organiclight-emitting devices

We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (η_ext) of (10.0 ± 0.5) % was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy) ₃) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4'-N, N'-dicarbazole-biphenyl (CBP) ambipolar carrier transport host     

调度操作技术支持系统体系结构的分析

针对调度操作技术支持系统的现状和存在的问题,从调度操作的业务流程入手,具体分析了调度工作的特点以及相关的调度操作软件业务需求,采用软件体系结构理论,提出基于状态机模型的调度操作技术支持系统新体系,为调度操作软件下一步的规划和发展提供了系统性的框架。     

Monte-Carlo Simulation of Clocked and Non-Clocked QCA Architectures

We present a Monte Carlo simulation of two implementations of Quantum Cellular Automaton (QCA) circuits: one based on simple ground state relaxation and the other on the clocked cell scheme that has recently been proposed by Tóth and Lent. We focus on the time-dependent behavior of two basic circuits, a binary wire and a majority voting gate, and assess their maximum operating speed and temperature requirements for different sets of fabrication parameters.     

Programmable Controller Software Architectures for Advanced Machine Diagnostics

The goal of diagnostic programs is the achievement of high availability of a controlled machine or process. The software architecture of the programmable controller can have a significant impact on the degree to which that goal can be attained. Software architecture directly affects the ease with which the controller can be programmed to provide anticipatory diagnostics, fault detection, and fault diagnosis; the degree to which such diagnostic features can be clearly specified and documented; and the effectiveness with which diagnostic information can be presented to operators, supervisors, and maintenance personnel. Assuming adequate self-diagnostic features in the programmable controller, the most important contribution to high availability to be made by the controller's software architecture is the ease with which the diagnosis can be directly related to the operation of the machine or process and its sensors or actuators, rather than to the operation of the controller. Various software features are described which contribute to this ``visibility' of machine or process faults. Directions are indicated for future evolution of software architectures for machine and process diagnostics.     

高压断路器的防跳回路

高压断路器的防跳同路作用是防止断路器合闸过程中发生“反复”跳、合的跳跃现象，确保断路器每次合闸操作时断路器只能进行一次合闸操作。介绍了一种通常采用的防跳回路，分析了它的工作原理。对几种常见故障进行了分析，提出了解决这些故障的具体方法。     

断路器防跳回路接线改进

随着变电站设计标准化的应用,断路器防跳功能由断路器本体机构实现,在变电站调试投运过程中发生运行操作和监视失效现象,给电网安全稳定运行带来事故隐患.文章介绍了在新建变电站中对保护装置内跳闸监视、合闸保持回路及一次机构箱内接线设计进行改进,避免了事故隐患,经实际运用收到良好成效,在增强设备运行稳定及保证电网安全方面发挥了积极作用.     

开关电源供电架构的发展

本文综述开关电源供电架构的发展，分别介绍了集中式、分布式、中间母线式和分比式供电架构的优缺点，并就母线电压和供电架构在实际应用中的选择进行了分析，最后叙述了高频交流分布式架构的研究现状。     

异种钢管的焊接

介绍了使用ERNiCr-3焊丝用于TP347H与12Cr1MoV异种焊接接。从母材性能、焊接材料的选择、焊接工艺评定等方面予以详细的分析和验证。     

保护控制回路与断路器操作机构回路的配合

工程设计中保护控制回路与断路器操作机构回路之间的配合不尽完善,通过实例分析了三相机械联动断路器操作机构和保护分相操作箱回路之间的不协调、断路器位置操作切换开关在控制回路中的接线及防跳回路存在的问题,并提出改进方法。     

智能型应急照明系统在智能建筑中的应用

通过对中央监测型应急照明系统的介绍及其与传统应急照明系统设计的对比,结合工程实例提出了智能建筑中应急照明系统设计的新概念,新思路和新方法。     

断路器信号回路测试经验

对断路器信号回路的常见故障进行了分析,对现场经验进行了总结,以供大家参考。     

变电站与其他建筑相结合设计建设

变电站与其他建筑相结合设计建设是城市电网与城市建设协调发展的一种具体做法.从变电站与其他建筑想结合设计建设的优越性,说明这一做法完全必要.以大量实例分析变电站与其他建筑相结合设计建设的几种型式及其特点,总结归纳了尚需关注的问题并提出了解决的措施和建议.     

Microgrids: Architectures,Controls, Protection,and Demonstration

Abstract—In the recent years, there has been a growing interest in the concept of microgrids to integrate distributed generation systems and to provide higher reliability for critical loads. Several microgrid demonstration projects have been implemented to investigate further and advance this emerging concept. This article provides a detailed review of microgrid systems. It describes different architectures, including AC, DC, and hybrid systems. Various microgrid components, including sources, converters, and loads, are illustrated. Microgrid management and controls are discussed, and a modified natural droop control is described in detail. Both physical layers and standard protocols are explained for communication in the microgrid structure. The unique protection complexities have been raised and discussed in the presence of distributed generations and bidirectional power flow. A demonstration of a military microgrid system at Fort Sill is illustrated, and the experiment of a typical microgrid operation scenario is provided.     

合分闸回路对真空断路器的影响

主要针对真空断路器合闸与分闸速度对真空断路器的损害性,归结出线圈两端工作电压偏低是影响真空断路器寿命与安全性能的主要原因,提出利用电容滤波、补偿以提高真空断路器线圈两端电压,实践证明,具有电容滤波、补偿的电路,真空断路器的分断能力、可靠性以及寿命上都有了很大提高。     

高压直流断路器振荡回路特性

无源直流断路器常用于高压直流输电工程换流站直流场上。为了研究高压直流断路器振荡回路特性,以寻求最佳的参数配置,分析了L、C参数对直流开断的影响,给出了工程中开断电流的计算公式、额定连续过负荷直流电流的取值方法以及直流断路器组成元件的主要应力,并结合实际直流工程数据加以仿真验证,定性给出的直流断路器主要参数随L、C参数变化的规律。     

防跳回路和断路器的时间配合

同样的防跳回路接线,用在同类型的保护设备,如果断路器的分闸时间不同,会有回路接线正确和不正确的结果,所以在验收防跳回路时,要规范验收程序,细心观察,理解回路接线的时间配合,才不会走过场,造成事故隐患.     

一种含有均压均流电路的限流式高压直流断路器

针对混合式直流断路器电力电子器件依靠燃弧电压导通,极易出现过压过流等问题,提出了一种新型限流式直流断路器拓扑,设计了其固态开关的均压均流电路,并对其进行建模分析。所提出的拓扑在断路器正常运行时无额外损耗,在短路故障发生时可以无延时地导通固态开关,并快速切断短路电流,其均压均流电路在不影响故障切除的同时能有效均衡各电力电子器件的电压电流。最后对所提拓扑在PSCAD/EMTDC软件平台上进行建模仿真,结果表明提出的新型限流式直流断路器能够在短路故障发生时有效限制短路电流上升,快速切断故障,并可靠地保护固态开关。     

Heterogeneous integration through electrokinetic migration

We apply basic electrophoretic motion to semiconductor materials engineering for development of the next level of heterogeneous integration technology. Furthermore, we demonstrate the utility of these tools in integration of inorganic devices with biological species in order to explore the utility of these tools in biotechnological applications.Electrical and optical addressing techniques are shown to allow for more rapid and parallel patterning of biological species and inorganic objects