摘要：随着科技的日新月异，人们的日常生活也越来越不能缺少电，电力系统保障了人们现代化的需求。它对社会发展的贡献是巨大的，然而电力系统的事故所造成的危害同样巨大，因此对保护电力系统的设备的研究是当今的必要任务。本文主要对电力系统的应用情况，针对欠频减载设备的发展及其缺点探讨，开始微机数显欠继电器的设计。本文第一步对频率特性，所要实现的功能进行分析，决定了方案。采用C55单片机和功能强大的编程语言，对微机数显欠继电器开始具体设计。然后硬件方面，加入LED显示器和键盘接口，以实现实时频率检测和良好的人际互动。最后软件方面，键盘中断模块和AD转换模块等的设计是功能更强大。本文使用单片机技术，使欠频继电器工作更快速，更准确，保障了电力设备的正常运行。38717
毕业论文关键词： 单片机；欠频率；继电器
A Digital Under-frequency Relay Based Microcomputer
Abstract：With the rapid development of science and technology, our life is increasingly separated from power, power system to protect our modern needs. Its contribution to social development is enormous, however, the power system accident caused by the same great harm, so the protection of power system equipment research is the necessary task today. In this paper, the application of power system is mainly for the development of the less frequency and load shedding equipment and its disadvantages, and the design of a digital under-frequency relay based microcomputer is started. The first step of this paper is to analyze the function of the frequency, and it decides the scheme. Using C55 microcontroller and powerful programming language, the digital under-frequency relay based microcomputer began to design specific. Then, with the hardware, join the LED monitor and keyboard interface to achieve real-time frequency detection and good interpersonal interaction. Finally, the design of the keyboard interrupt module and the AD conversion module is more powerful in the final software. In this paper, single-chip microcomputer technology, so that the frequency relay work faster and more accurate, and protect the normal operation of power equipment.
Keywords：microcomputer；under-frequency；relay
目 录
1 绪论 1
1.1 课题的主要来源 1
1.2 欠频减载设备发展情况 2
1.3 课题的目的和意义 3
2 欠频减载的研究 4
2.1 频率状态和频率偏差 4
2.1.1 频率状态 4
2.1.2 频率偏差 5
2.2 频率特性 5
2.2.1 静态频率特性 5
2.2.2 动态频率特性 7
2.3 频率下降的影响 8
2.4 欠频减载的方法 10
2.5 本章小结 10
3 系统功能的分析 11
3.1 欠频减载装置的功能 11
3.2 欠频减载的方案 11
3.2.1 频率变化率的计算 12
3.2.2 事故的分类 12
3.2.3 防止误动作 13
3.3.4 频率状态的显示 14
3.3 本章小结 14
4 硬件系统的设计 15
4.1 频率测量电路 16
4.2 模拟量采集电路 17
4.3 显示电路 18
4.4 开关量输入输出电路 19
4.5 本章小结 20
5 软件系统的设计 21
5.1 软件的基本结构 21
5.2 模块的设计 22
5.2.1 主程序模块 22
5.2.2 功能设置模块 23 微机数显欠频继电器设计:http://www.youerw.com/zidonghua/lunwen_37756.html