发布时间：2015-01-22 来源：人大经济论坛

自动化专业论文范文 目 录 摘 要I AbstractII 1 绪 论1 1. 1 自动重合闸的概述1 1.1.1 自动重合闸的定义1 1.1.2自动重合闸的基本概念2 1.1.3 自动重合闸的构成和原理4 1.2 本文的主要研究内容5 1.3 可编程控制器概况8 1.3.1 PLC的基本概念8 1.3.2 PLC的国内外状况15 1.3.3 PLC的发展趋势16 2 PLC实现自动重合闸试验装置设计19 2.1 PLC自动重合闸系统概述19 2.2系统的核心—PLC的选型与设计19 2.2.1 S7-200的概况20 2.2.2 S7-200的软件编程28 2.3 本设计硬件设计31 2.3.1 I/O地址分配表31 2.3.2 PLC硬件接线图31 2.3.3二次控制回路接线32 总 结34 致 谢35 参考文献36 附 录:控制程序代码37 附录A　外文翻译39 摘 要 据统计，系统中永久性故障一般不到10%，其余故障都是由于雷击过电压引起的绝缘子表面闪络，大风时的短时碰线，树枝落在导线上等引起的瞬时故障。当系统出现故障时，保护立刻动作是线路或设备断电，在非常短暂的时间内，故障点的电弧就会自动熄灭，是绝缘得以恢复。此时自动重合闸装置动作，自动将断路器合上，恢复系统正常运行。 针对传统的电磁式重合闸装置存在动作级数多、触点粘连等不可靠因素,采用PLC实现自动重合闸,对其进行硬件设计和软件编程,所用元件极少,故障率大大降低,克服了电磁式重合闸控制方式的不足。控制柔性好,控制系统的供电可靠性高。分析了传统继电器式自动重合闸装置存在的缺点，提出利用PLC 设计自动重合闸装置，绘出梯形图。 关键词: 可编程逻辑控制器; 自动重合闸; 可靠性; PLC; 应用 Abstract According to statistics, permanent fault in the system generally less than 10 per cent and the rest were due to failures caused by lightning over-voltage insulator surface flashover, when the winds of short-term touch lines, tree branches fell from the upper wire transient fault. When the system failure, immediate action to protect the power lines or equipment, in a very short time, the point of failure will automatically extinguish the arc, is insulated to resume. At this point automatically reclosing device moves automatically close the circuit breaker and restore normal operation system. Aiming at the unreliable factors that the traditional electromagnetic ARD device has more actiongrades and adhering of contact, using PLC to realize the auto-reclosure andmaking the design for hardware and soft-ware, the used components is fewer, accident chance ismuch lower. The method overcomes the defects of the traditional electromagnetic ARD control method. So control flexibility is strong and the reliability of power-supply of control system is high. The artica Analyses the defects in traditional relay automatic reclosing, proposes application of PLC in the design automatic relcosing and draws a ladder chart. Key words: pragramable log ic con troller ( PLC) ; auto-reclosure; reliab ility; application