【作者】 郝婧；

【导师】 刘军； 石文渊；

【作者基本信息】 西安理工大学 ， 模式识别与智能系统， 2008， 硕士

【摘要】 异步电动机广泛应用于工矿企业,它是各种电动机中应用最广、需求量最大的一种电机。据统计,电网的总负载中动力拖动约占60%,动力负载的绝大部分是三相交流异步电动机,因此它的保护问题长期以来受到人们的关注。近年来,随着计算机技术与电子技术的不断发展,出现了以微处理器为核心的电动机综合保护系统。这种新型的保护系统与传统的保护系统相比,具有强大的逻辑分析与数据处理功能、故障记录与故障分析功能以及易于实现网络化管理等显著的优点,因而成为当前电动机保护装置的主要发展方向。本文正是在基于这一背景开展对电动机综合保护系统的研制和开发工作的。文中采用对称分量法理论分析了电动机的各种对称性故障和不对称性故障,在应用中采用了负序和零序电流的检测方法,特别在过载保护上进行了深入的研究。在此基础上设计了针对过载、堵转、短路、断相、欠压、过压等故障的保护方法及电路。课题为基于RS-485总线的电动机智能控制保护系统,本文设计了以32位微处理器AT91SAM7S64为主控中心的装置,具体进行了监测控制中心、信号调理及输出控制模块、分析处理模块、人机对话模块以及通信模块的设计。并且设计了实用的系统软件,充分利用它强大的信号处理能力,结合电动机保护理论完成了具有故障诊断与保护功能的新型电动机综合保护系统的设计。更多还原

【Abstract】 Asynchronous motor ,which is one of the most popular kinds of motors ,is widely used in the corporate enterprises .According to statistics ,power drive ,most of which are three-phase AC asynchronous motors ,accounts for about 60 percent of the total load in the power networks .So it’s greatly significant to prohibit the three-phase AC asynchronous motor from damage accidently.In recent years, with the development of computer technology and electronics, computer integrated protection systems with the core of the microprocessor are put into service. Compared with the traditional system of protection, the new protection system has powerful logic analysis and processing capabilities .The fault can be recorded and analyzed too .And this significant advantages become the main developing direction of motor protection device. The comprehensive protection of the electrical system researched in this paper is under this background.This theory of symmetrical components method is used to analyze the varieties of symmetrical and asymmetrical faults of motor, and the measuring method of negative and zero sequence is adopted in this paper. Especially the protection of overload condition is researched. The motor faults of over-loading, short circuit, phase failure, over-voltage, under-voltage can be dealt with by the device.The device with the 32bits MPU AT91SAM7S64 designed. The hardware of the device consists of monitoring and control parts, signal conditioning and output control modules, analysis and processing modules, interactive modules, communication modules, and the practical programs is designed, by making full use of MPU AT91SAM7S64 powerful capture function to outside event and strong ability of treatment to signal ,a new type of motor protective device is designed.更多还原