Application study of a high‐temperature superconducting fault current limiter for electric power system

Using high‐temperature superconductors, a superconducting fault current limiter (SFCL) was fabricated and tested. The superconductor and a vacuum interrupter serving as a commutation switch were connected in parallel with a bypass coil. When a fault occurs and excessive current flows, the superconductor is first quenched and the current is transferred to the bypass coil because of the voltage drop of the superconductor. At the same time, since a magnetic field is generated by the current flowing in the bypass coil, the commutation switch is immediately driven by an electromagnetic repulsion plate connected to the driving rod of the vacuum interrupter (VI), and the superconductor is separated from this circuit. Using the test model, we were able to separate the superconductor from the circuit by the movement of the VI within a half current cycle and to transfer all current to the bypass coil. Since the operation of the commutation switch is included in the current limiting operation of this test model, it will be a useful circuit in the development of SFCL in the future. Moreover, since it can make the energy consumption of the superconductor small during the fault state due to the realization of a high‐speed switch with simple composition, the burden on the superconductor is reduced compared with the conventional resistive type of SFCL and it is considered that the flexibility of SFCL design is increased. Cooperation with a circuit breaker was also considered; trial calculations of the parameters and energy of operation were conducted and a discussion of the installation of the SFCL in an electric power system is presented. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(4): 20–29, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20265     

强X光辐射场加门光电倍增管实验研究

我们在神光装置打靶现场对加门光电倍增管进行了调试和研究。实验结果表明，光电倍增管的恢复时间是随基饱和深度的增加而增加的。ＸＰ２０４０光电倍增管配上２μｓ的高压脉冲开关可用于偿烁探测器在神光装置辐射驱动聚变靶时进行强Ｘ射线辐射场的低产额中子测量。     

军用战术分组无线网

本文描述澳大利亚国防部队正在开发的分布式分组无线网络的体系结构、信令协议和信关功能。     

微细加工技术在微光开关制造中的应用

微光开关是新一代全光通信网络中的关键器件。利用微细加工技术制造微光开关具有很多突出的优点，受到了广泛的研究。总结了几种典型的微光开关制造中运用的微细加工技术，并介绍了它们的应用和相应的特点。     

硅基PZT压电驱动MEMS光开关的设计与优化

采用压电多层悬臂梁理论分析模型 ,研究了一种新型PZT压电复合多层膜悬臂梁驱动光开关的机械性能 ,探讨了结构参数与悬臂梁机械性能的关系及影响光开关机电性能的因素。提出了一种新的硅基PZT压电复合膜悬臂梁驱动光开关的制作方法。给出了 2 5V工作电压下优化的器件结构 ,并对理论分析结果与压电复合多层膜悬臂梁的有限元耦合场分析结果进行了比较     

11通道10位串行A/D转换器TLC1543及其在单片机系统中的应用

介绍一种多通道串行A/D转换器TLC1543的功能特点和工作过程，讨论了器件工作方式的选择，以及器件的工作时序，并给出了TCL1543与89C51的实际应用接口电路及软件清单。     

高功率激光精密小能量测量系统研究

介绍了用于神光Ⅱ装置 8路功率平衡的全自动精密小能量测量系统 ,并用自动控制半波片衰减装置对其性能进行了测定。系统稳定性精度优于 1% (rms) ,量程可达三个量级范围     

励磁开关主触头烧蚀的原因与改进

介绍了在生产中励磁开关主触头烧蚀的解决方法。     

总线分时传送数据法在PLC控制系统中的应用

在实际设计中采用一种总线分时传送数据的方法，将象拨码开关和数码管一类外部设备，通过一组公共连接线（总线）与ＰＬＣ的Ｉ／Ｏ相连接，大大地减少了所需ＰＬＣ的Ｉ／Ｏ数量，减少了设备投资，在实际的设计工作中收到了非常好的效果。本文地采用这种总线方式传关数据的具体实际作了深入而全面的介绍。     

Fault tolerance design for large-scale optical switches

In this paper, we present an enhanced fault tolerance in large-scale optical switches through innovations in architecture and control logic design. A large-scale switch is constructed from a network of 2×2 optical switch elements (SEs). Classic switch network architectures, such as the Benes, are not designed with fault tolerance in mind. There are three major contributions in this paper: (1) we developed an analytical method, referred to as the probability accumulation method, to calculate the average connection blocking probability in a faulty switch network; (2) we provided a failure-aware routing algorithm to effectively circumvent connections from defected SEs in a dilated Benes switch; and (3) we improved the connectivity pattern of the Benes network to further reduce the blocking probability, especially when the SE failure rate is low.