探究10 kV配网线路接地常遇故障及解决方法

10 kV配网线路是电力系统的关键组成部分,而接地故障是其中常见的问题之一。接地故障可能导致电力系统的稳定性下降、设备损坏甚至安全事故的发生。为了解决10 kV配网线路接地常遇故障,根据10 kV配网线路接地故障的主要原因,提出一系列解决方法。其中包括定期巡视和检测线路绝缘状况、及时修复绝缘破损、加强接地电阻测量和维护、优化接地网布置以及使用先进的监测技术和装置。通过采取有效的预防和维护措施,可以降低10 kV配网线路接地故障的发生率,提高电力系统的可靠性和安全性。     

基于TMS320F240的红外线设备远程报警系统设计与实现

在铁路安全运输工作中,红外线探测设备的故障判别及处理在红外管理占有非常重要的地位,红外故障判别和处理主要以人工分析方式为主,存在着红外设备使用率降低等弊端.提出一种实现红外设备故障报警以及控制自动化方法,包括磁头检测、探头检测、通道检测等功能,并首次提出采用电子罗盘对磁头位姿进行检测,在实际故障诊断中具有实际意义,经过实验验证,达到满意效果.     

应用特高频检测方法处理gis局部放电故障

整个gis局部放电特高频检测设备主要是由高频传感器设备、示波器装置以及射频电缆这三个部分所构成的。该设备是应用特高频检测方法处理gis局部放电故障的核心所在。通过对其的应用,能够检测得出具体的局部放电信号,明确正确的放电位置。同时,可结合具体的检测结果,实现对gis局部放电故障的妥善处理。实践经验证实:此种检测方法应用下,对gis局部放电故障的处理效果良好,能够保障gis设备的正常使用。文章围绕这一中心,展开详细论述。     

基于奇异值分解的有载调压变压器故障智能检测算法

针对当前有载调压变压器故障检测方法存在故障检测时间长,故障检测精度低以及检测结果误差较大的问题,提出基于奇异值分解的有载调压变压器故障智能检测算法。采用奇异值分解方法,建立Hankel矩阵,对有载调压变压器设备的电流反馈信号进行奇异值分解,去除有载调压变压器设备电流反馈信号中存在的噪声信号。通过局域波分解方法,将去噪后的信号分解为若干个局域波分量。利用尖峰能量法,构建有载调压变压器故障检测模型,检测局域波分量,完成有载调压变压器故障的智能检测。实验结果表明,所提算法的故障检测时间较短,能够有效提高故障检测精度,减小检测结果误差。     

物联网故障设备检测系统的设计与实现

物联网环境下的设备相对复杂,人工检测成本过高,故障检测误差较大,因此,设计并实现了一种基于物联网的故障设备检测系统。系统通过采集模块获取故障设备的实时参数,利用控制器为SIM900B的GPRS通信模块实现各模块间信息的传输,采用核心芯片为S7-200型PLC的检测诊断模块,对故障设备信息进行分析和处理,判断故障产生的原因和位置,实现对故障设备的实时管理和诊断。软件设计过程中,对基于物联网故障设备检测系统的流程进行了详细分析,并给出无线传感节点接收和处理故障设备数据的程序代码。实验结果表明,所提系统具有很高的可行性及实用性。     

解析变电一次设备故障的预测与检测

本文主要分析了变电一次主要设备故障的常见预测及检测方法,并针对变压器、断路器、避雷器等主要设备故障的预测与检测方法、红外检测技术进行了详细阐述,以此来为变电一次设备故障的预测及检测工作提供参考,最终有效解决变电一次设备的故障问题,确保电力系统的安全稳定运行。     

浅析联锁设备故障在铁道信号检测维修中的重要性

在铁路管理维护工作中,需要根据铁道信号对铁路进行故障检测,而联锁设备是铁道信号的工作基础,也是基本保障设施,因此文章针对铁道信号联锁设备故障问题进行了深入的分析。在明确联锁设备的概念后,剖析了联锁设备故障的特点,有针对性地提出了几个维修检测铁路信号联锁设备故障的方法,以此为铁道信号检测工作人员提供参考,强化铁道信号的日常故障检测能力。     

大型群控式电梯设备的检测技术分析

阐述群控式电梯的总体结构、控制单元、设备检测,包括群控式电梯监控设备、运行单元、电梯电路板的检测,以及联机管理、故障抽查、故障点的后期监控。     

浅谈变电一次设备故障的预测及检修

本文介绍了就我国目前变电一次设备的现状以及在社会需求的背景下,对基础的变电设备的预测和检测方法进行相关的统计以及分析,对于变压器、断路器以及避雷器的故障预测、检测方法和红外检测技术进行相关分析,对于实践工作的高效开展起到一定的参考作用.     

通过绝缘油中氢气含量判定设备故障的应用分析

油色谱分析方法是对充油电气设备运行状况进行检测的重要方法,它对监测设备中的慢性、局部、潜在性缺陷十分有效,其中绝缘油中的氢气含量的检测对于电力设备具有重要意义.本文对绝缘油中氢气的产生原因进行分析,然后根据氢气的含量判断充油设备是否存在潜伏性故障,以及故障的类型、发展趋势,进而判断该设备能否继续正常运行,并提出设备检修试验周期及采取的对策.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks