毕业论文－－35KV线路保护装置设计

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1、 摘 要 现代电力系统中,继电保护装置是保证电力系统平安运行和提高电能质量的重要工具。随着变电站综合自动化技术的开展及其推广应用,微机保护装置已成为电力部门的普遍要求。 本文的主题是35KV线路保护装置设计,首先介绍了研究该装置的目的和意义、国内外的开展情况,并详细介绍了保护装置的原理与算法。 随后,本文详细介绍了装置所采用的单片机(AT89C52)和各辅助芯片的功能作用,以及相关电路的设计。本装置硬件包括数据采集系统、开关量输出电路、键盘显示电路、通讯电路以及供电电源等。 最后,针对本文的硬件编写了系统的软件局部,包括按键和液晶显示系统软件、串口通讯软件和保护功能程序软件,实现了对35KV线

2、路的三段式过电流保护和方向电流保护功能。关键词 微机保护 线路保护 单片机 Abstract In the modern power system, protective relaying equipment is of importance to guarantee the safety of the system operation and improve power quality.With the development of the integrated automation technology of substations and its application, microco

3、mputer protection installation has become the universal demand to the power sector. The theme of this paper is about the design of 35KV line protection of the device, firstly it introduces the purpose and meaning of this research on the device, the development both at home and abroad, and the princi

4、ple and algorithm of the protective device Then, it introduces the functions of the single chip microcomputer AT89C52 and each companion chip used by the device relating to its circuit design. The hardware includes data acquisition system, switching output circuit, keyboard display circuit,communica

5、tion circuit,power supplies and so on. Finally, the software system which is written according to in this paper the hardware of written parts includes the keys and liquid crystal display system software, serial communication software and protection function program software, thus realizing the three

6、-step over current protection and the direction of current protection function of the 35KV linesKey wordsMicrocomputer protectionLine protection Single chip microcomputer目 录摘 要IAbstractII第1章 绪论1 1.1研究的目的和意义1 1.2国内外开展情况2 1.3本文的主要内容4第2章 线路保护装置的原理与算法5 2.1 线路保护根本原理5 2.1.1 三段式过电流保护5 2.1.2 方向电流保护16 2.2 微机

7、保护算法22第3章 系统硬件电路设计26 3.1 主控制器27 3.2 模拟量采样电路28 3.2.1 电流互感器28 3.2.2 电压互感器29 3.2.3 低通滤波电路31 3.2.4功率因数测量电路33 3.3 采集电路34 3.4 输出及报警电路35 3.4.1开关量输出电路35 3.4.2 报警电路36 3.5 键盘电路37 3.6 LCD显示电路38 3.7 通讯电路39 3.8 供电电源40 3.8.1 微处理器供电电路40 3.8.2 放大器供电电路41第4章 系统软件设计43 4.1 软件系统构成43 4.2 监控系统设计44 4.2.1 监控系统实现的功能44 4.2.2

8、监控系统程序设计44 4.3 串口通讯软件设计46 4.3.1 串口通讯的功能46 4.3.2 串口通讯编程46 4.4 保护功能程序设计47 4.4.1 数据采集系统软件设计48 4.4.2 故障处理系统软件设计51结 论52致 谢53参考文献54附录156附录257ContentsAbstractIAbstractIIChapter1 Introduction1 1.1 The aim and meaning of the research1 1.2 The development on domestically and abroad2 1.3 The main content4Chapt

9、er2 The principles and algorithms of line protective devices5 2.1 Line protective devices Fundamentals5 2.1.1 Three-phase current protection5 2.1.2 Directional current protection16 2.2 Microcomputer-based protection algorithms22Chapter3 The hardware circuit design of system26 3.1 Host Controller27 3

10、.2 Analog sampling circuit28 3.2.1 Current Transformer28 3.2.2 Potential transformer29 3.2.3 Low-pass filter circuit31 3.2.4 Power factor measurement circuit33 3.3 Data acquisition34 3.4 Output and alarm circuit35 3.4.1 Switching output circuit35 3.4.2 Alarm circuit36 3.5 keyboard circuit37 3.6 LCD

11、display circuit38 3.7 Communication circuit39 3.8 Power supply40 3.8.1 Microprocessor power supply circuit40 3.8.2 Amplifier power supply circuit41Chapter4?The?design?of?system?software43 4.1 Software system structure43 4.2 Monitoring system design44 4.2.1 Function of achieving monitoring system44 4