Design and Research of Power Quality Surveillance

目前我国的电力电网系统处在高速扩容发展阶段，用户对电能质量要求也在不断提高。及时分析掌握电网的电能质量水平，找出影响电网电能质量的因素，实现实时动态测量电能质量的主要指标，对电网的安全和经济运行有着积极意义。随着数字化及网络通讯技术的发展，要求新型电能质量监测分析仪,不仅能够测量基本电力参数和电能质量指标，还应具备分析、存储和实现数据上传等多种功能。本文通过对电能质量的五项主要指标基本特征的分析，结合我国和IEC标准对电能质量的要求，设计了一种电能质量监测装置，可以实现对母线电压、电流量进行实时采集，后台软件通过选用的计算方法对采集数据进行分析和处理，实时地得到电压和电流的基波有效值﹑谐波有效...At present,power system is in the high speed expansion and rising in our country.Grasping the power quality levels timely,identifing the factors that affect power quality,measuring the key indexes of power quality in real-time,which have positive meanings for network security and economic operation.The developpments of digital and network communications technology,require the new type of power qua...学位：工学硕士院系专业：物理与机电工程学院机电工程系_测试计量技术及仪器学号：2005130174

电能质量监测系统的设计

随着社会的进步,工业农业的快速发展,电力发展是必不可少的。随着非线性负荷及冲击性负荷的增加,电能质量严重超标,正在大范围地污染供电环境,危及电网及其供电设备的安全稳定运行,降低电力企业的经济效益,因此有必要对电能质量进行实时在线监测,及时了解电网电能质量水平,以便采取措施改善﹑提高供电质量。作者针对目前存在的高次谐波问题,对电能质量参数进行长期监测和分析,文章着重介绍了该系统的硬件工作原理﹑结构﹑功能、部分硬件设计及部分软件的设计

Design and Study of Automatic Fire Alarm System

论述了单片微机火灾报警系统的组成及工作原理。该系统通过火灾探测器采集到信号并且以电压形式传到地址编码器进行变频,再经过A/D转变成数字信号,传输到单片机控制器,启动声光报警显示、电话报警和打印,介绍了可实现通讯传输的报警控制器硬件接口电路和软件的设计及系统实现火灾区域位置报警及故障巡检的功能,该系统探测器采用两线制方式实现多区域报警,减少墙内走线,可靠性提高,便于安装。Expounds the composition and operating principle of chip microcomputer-based fire-alarm system.Firstly,the system collects signals and delivers them to the address coder in the form of voltage to convert frequency by fire detector.Then the signals are transformed into digital ones by A/D and delivered to controller to activate acousto-optic alarm display,telephone warning print.The hardware interface circuit design and software design of the alarm controller with function of communication delivery are introduced in the paper.Detectors of this system use two wire system to realize multiregion alarming,which reduces the wall wiring,improves the reliability and eases the installation