本 科 毕 业 设 计（论文）
变电站中央事故和预告信号的PLC控制
Control of the Central Incident
and Warning Signal of Substation Based on PLC
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变电站中央事故和预告信号的PLC控制
变电站中央事故和预告信号的PLC控制
电气工程及其自动化
［摘 要］ 目前，大多数电气变配电所的中央事故和预告信号系统仍然使用继电接触器控制，其缺点是接线多且复杂、体积大、动作速度慢、修理困难、容易发生误动作。针对这种情况，本课题使用西门子S7-200PLC代替传统的继电接触器控制变电站中央信号系统。中央信号系统主要包括事故音响信号、预告音响信号、灯光信号，根据传统继电器控制原理对其进行I／0分配和绘制中央信号系统流程图及编写中央事故和预告信号系统梯形图控制程序。最后经过模拟仿真运行，能够实现当设备发生故障或出现某些不正常运行情况时，中央信号装置能正确自动发出音响和灯光信号，帮助工作人员及时
发现故障及隐患，并采取适当措施，防止事故进一步的扩大。满足中央信号系统的要求。
［关键词］ 西门子S7-200； 变电站； 中央事故和预告信号； 音响信号
Control of the Central Incident
and Warning Signal of Substation Based on PLC
Electrical Engineering And Automation Specialty
Abstract: At present the central signal system of the majority of our substations and distributions is still using the traditional relay contactor control system，whose disadvantages are multiple and complex wiring，bulky, slow movements，difficult to repair, prone to malfunction．For this situation，this paper uses the Siemens S7-200 and designs the central signaling system to control the substation instead of traditional relay contactor．The central signaling system mainly includes incident sound signals、warning signals and light signals which composes the I/0 allocation tables and flowing diagram and the ladder diagram control programs of the central signal system．Through the simulation，it is able to currently emerge sound signals and light signals when the facilities generate malfunction and abnormal phenomenon，it assists people to find and orderly deal with it so as not to broaden the incident ,and fulfills the requirements of the system control．
Key words: Siemens S7-200; substation; central signal system; audio signal
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变电站中央事故和预告信号的PLC控制
目 录
1 引 言 .............................................................................................................................. 1 1.1 选题背景和意义 ..................................................................................................... 1 1.2 PLC在国内外的发展状况...................................................................................... 1 1.3 设计的主要内容 ..................................................................................................... 2 2 中央信号系统简述 ........................................................................................................ 3 2.1 断路器控制和信号回路简述 ................................................................................. 3 2.2 采用电磁操作机构的断路器控制和信号回路 ..................................................... 3 2.2.1 转换开关 .......................................................................................................... 3 2.2.2 电磁操作机构的断路器控制及信号回路 ...................................................... 4 2.3 中央信号装置 ......................................................................................................... 6 2.3.1 中央事故信号回路 .......................................................................................... 7 2.3.2 中央预告信号回路 .......................................................................................... 7 3 硬件设计 ........................................................................................................................ 9 3.1 PLC在中央信号系统的要求.................................................................................. 9 3.1.1 PLC与继电器的区别....................................................................................... 9 3.1.2 用PLC进行中央信号系统改造时遵循原则 .............................................. 10 3.2 PLC选型................................................................................................................ 10 3.3 S7-200系列PLC ....................................................................................................11 3.4 I/O地址分配.......................................................................................................... 12 4 软件设计 ...................................................................................................................... 13 4.1 程序流程图 ........................................................................................................... 14 4.2 STEP7—MICRO/WIN V4.0编程软件 ................................................................... 14 4.2.1 STEP7-Micro/WIN V4.0编程软件主界面及基本组成 ............................... 15 4.2.2 梯形图的编写 ................................................................................................ 15 4.3 系统的控制程序 ................................................................................................... 16 4.3.1 PLC控制中央事故信号................................................................................. 16 4.3.2 PLC控制中央预告信号................................................................................. 18 4.4 控制程序的调试与仿真 ....................................................................................... 19 4.4.1 程序调试 ........................................................................................................ 19
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变电站中央事故和预告信号的PLC控制
4.4.2 系统仿真 ........................................................................................................ 19 结束语 .............................................................................................................................. 23 附录 .................................................................................................................................. 25 致谢 .................................................................................................................................. 32
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