固体继电器虚拟装配系统开发

论述了产品装配模型的特点,讨论了在电气领域引进虚拟现实技术就产品装配过程进行仿真的原理和可行性,分析了开发固体继电器虚拟装配系统面临的主要问题及解决方法,并基于AutoCAD2000图形平台和ARX开发工具实现了该系统。     

美国固体继电器新品简介

美国制造业的复苏,对固体继电器工业可能产生影响。据Venture Derelopment公司预测,用于控制电机、电灯和变压器等的固体继电器的美国市场5年内可能翻一番。非机电继电器(包括固体继电器和混合式继电器)年销售额将从1987年的1.27亿美元上升到1991年的2.44亿美元。 为了促进国内固体继电器的发展,现将近年部份新品简介如下:     

固体继电器的功耗

通过从理论上系统地分析并推导了固体继电器的功耗定量计算表达式，为SSR的热设计、热分析提供了数据，同时以JG－300F型DCSSR和JG—20F型ACSSR作为应用举例。     

固体继电器：继电器市场的新贵

由于寿命长、反应时间快、可靠性高及控制切换功耗低，固体继电器在全球继电器市场中的地位越来越突出，有望成为市场新宠。     

新型自适应继电器装配CAPP系统

为了满足不同用户的各种需要,基于自主软件继电器装配计算机辅助工艺设计(RACAPP1.0)开发了一种新型的自适应继电器装配计算机辅助工艺设计系统(ZPCAPPl.0).其自适应性包括:提供给用户所需规格的工艺设计说明书;自动设计不同格式的流程图;自动生成不同格式的装配工艺卡以及其他工艺文件;有一个共享数据库;基于Windows环境;充分利用Word功能输出Word格式的文档.     

转换型直流固体继电器的设计

介绍了一种一组转换型直流固体继电器的原理、特点以及应用。文章提出了一种加速继电器转换的方案。合理利用光隔离和变压器隔离的组合，使切换时间控制在100μs以下。这一特点，使其在高速控制场合较其它类型继电器占有很大优势。     

直流固体继电器电路的优化设计

在分析常用直流固体继电器基本电路结构及其特点的基础上，主要从输出开关的热损耗及动态开关损耗的角度，提出了目前适合大，小功率直流固体继电器电路结构和进一步提高电路可靠性的几点设计方法。     

继电器装配工艺计算机辅助设计系统

介绍了研制的继电器装配CAPP系统。以MDT和3DS MAX为支撑软件,以Visual C 6.0为开发工具,工作于Windows平台的可视化、智能化的继电器装配CAPP系统。     

继电保护柔性定值单管理系统开发

开发了一种继电保护柔性定值单管理系统,实现了整定计算和定值单管理的一体化和定值单流转的网络化、自动化控制,并解决了保护装置多样性和定值项不确定性的影响。介绍了系统的整体结构;详述了利用ActiveX技术和Excel格式电子表格设计三层式柔性定值单模版,实现定值单的内容和格式的自定义;阐述了利用工作流的基本思想对定值单的修改、审核、执行等一系列流转过程建模,实现其在多部门、多用户中的协调和网络化自动控制。     

Steep front impulse flashover tests on a solid-state relay

A protective relay system, subjected to a high-voltage, steep-front impulse, has been shown to fail in the laboratory via flashover-induced current follow through on the DC power supply. Laboratory experiments were performed to characterize the response of a protective relay to steep-front impulses. These impulses may be the result of a nuclear-induced, high-altitude electromagnetic pulse. Tests were also conducted to quantify the protection offered by a surge protection package on the DC circuits of a relay system. Results from these tests were used to assess the vulnerability of a protective relay     

虚拟Massive MIMO信道测量系统的研制

设计并研制了一种低成本的虚拟大规模多天线(以下简称Massive MIMO)无线信道的系统,用于提取无线信道特性。系统由激励信号源、双锥全向天线、时钟同步单元、射频接收单元和数据采集存储单元等模块组成,并通过上位机控制软件控制。文章先介绍了系统实现原理和各部分功能模块的作用,进而通过实验室校准验证所设计的系统能够准确的提取出无线信道传播特性,例如,在多径的测试中可以准确的得到多径数目、多径时延以及多径损耗。另外在角度域的测量中,可以以最大平均误差不大于0.6°得到1×2MIMO的到达角度。     

继电保护日常运行管理专家系统的开发

根据华东电网继电保护多年的运行管理经验 ,在现有的整定、管理程序应用的基础上 ,对继电保护日常运行管理专家系统的开发应用提出了初步的设想并进行了初步的研究     

继电保护日常运行管理专家系统的开发

根据华东电网继电保护多年的运行管理经验,在现有的整定、管理程序应用的基础上,对继电保护日常运行管理专家系统的开发应用提出了初步的设想并进行了初步的研究.     

Commutated relay switching system

A basic electronic control scheme which allows relays to be utilized at fast switching rates with long lifetimes and is applicable with standard microprocessor-based systems is described. The basic power-switching circuit consists of a commutating diode connected in parallel with the contacts of a single master relay, and this combination connected in series with a parallel combination of slave switching relays and associated loads. Timing and control is provided in such a way that the relays are switched at a high frequency but never with current flowing through the contacts. An actual range application with multiple loads is described, along with the necessary circuitry and logic. In addition, a diagnostic scheme is described which takes advantage of the commutated system to determine component failures in the power switching loads     

TXP系统虚拟AP功能软件设计开发

介绍了针对TXP（Teleperm XP）分散控制系统虚拟自动化处理器AP（Automation Processor）功能软件的设计与开发．实现了数据采集、数据输出及真实AP功能块所具有的必要控制功能。根据虚拟AP软件的设计思想．运用面向对象程序设计（OOP）技术．在Windows2000平台上,采用Visual C＋＋6．0进行软件开发。该软件以对象类库函数的方式将所有数据和算法封装在一起．供仿真主控程序调用。它充分利用虚拟分散控制系统（DCS）技术的高度逼真性和开放性．实现了控制功能：而开发成类库文件的形式．达到了修改简单、维护工作量小和复用性好的效果。     

Development and hardware implementation of a reliable protective relay data acquisition system

This paper proposes an intelligence based protective relay data acquisition system to correct current transformers and capacitive voltage transformers secondary waveform distortions. The protective relay data acquisition system receives voltage and current signals from current transformers and capacitive voltage transformers and prepares the inputs to the main board after some pre-processing. Current transformers and capacitive voltage transformers provide instrument level current and voltage signals to meters and protective relays in high voltage and extra high voltage systems. The accuracy and performance of protective relays in high voltage and extra high voltage systems are directly related to steady state and transient performance of current transformers and capacitive voltage transformers. Current transformers saturation and capacitive voltage transformers transient could lead to protective relay mal-operation or even prevent tripping. The key of the proposed scheme is to use artificial neural network to achieve the inverse transfer functions of current transformers and capacitive voltage transformers. Simulation studies are preformed and the impacts of changing different parameters are studied. Performance study results show that the proposed scheme is accurate and reliable. The proposed algorithm has also been implemented and tested on a digital signal processor board. Details of the implementation and experimental studies are provided in the paper.