Subject: The Research of 10KV Single-ended Protection Ddevice Base on PLC(Hardware)
ABSTRACT
China's power industry, as the country's most important energy industry, has been in the priority development status, Power for the development of enterprises is also eye-catching. Power system for the rapid development of protection have made new demands, which will enable the relay to rapid development.
Programmable Logical Controller (PLC)is a device that contains many advantages of co- mputer and relay, such as convenience for using, stable in practice, smaller volume, it was widely used in the industry area, and it is becoming a very useful device in power system ,too. Three-phase current protection is 10 KV lines to protect the more commonly used method of protection. This paper first introduced the three steps to protect the basic principles and the connection mode. This was followed by the setting calculated in accordance with the principle of derivation of the three steps to protect the value of action, sensitivity and setting time limits and other content. Then design and production company based OMERON CPM1A-40 in a line protection devices, the last line simulation software and hardware through 10 KV lines to achieve a single-ended power supply network of three steps to protect the current action trial.
The experiments show that this design study by the Three-phase current protection device, a reliable action, selectivity better, more complete functional characteristics, so that it can protect the paragraphs coordinate with each other, have a certain prospect.
Key words: protection, Three-phase current protection, Setting, PLC
目录
前言 1
第一章 绪论 2
1.1 继电保护技术的发展和现状 2
1.2 本课题的主要内容 4
第二章 10KV继电保护原理 7
2.1 10KV系统中应配置的继电保护 7
2.2 10KV系统中继电保护的配置现状 7
2.3 继电保护的基本概念 7
2.3.1 10KV供电系统的几种运行状况 7
2.3.2 10KV供电系统继电保护装置的任务 8
2.3.3 对继电保护装置的基本要求 8
2.4 继电保护的基本原理 10
2.5 几种常用电流保护的分析 10
2.5.1反时限过电流保护 10
2.5.2 定时限过电流保护 11
2.5.3 电流速断保护 12
2.6 三段式过电流保护装置 14
2.7 自动重合闸 15
第三章 PLC概述 16
3.1 PLC的组成与工作原理 16
3.2 PLC的特点 16
3.3 PLC的硬件组成 17
3.4 PLC的软件 18
3.5 PLC控制系统的一般设计步骤 19
3.6 输入回路的设计 19
3.7 OMERON公司C系列PLC介绍 19
第四章 硬件设计 21
4.1 互感回路部分 22
4.1.1 电流互感器 22
4.1.2 电压互感器 23
4.1.3 变送器 24
4.2 整流部分 26
4.3 滤波部分 29
4.3.1 电容滤波器 29
4.3.2 RC-π型滤波器 30
4.3.3电感滤波器(Inductance Filter) 31
4.4 比较整定电路 31
4.4.1电压回路的形成 31
4.4.2比较回路的形成 32
4.5模拟电子开关 33
4.6 输出回路 34
第五章 软件部分 35
第六章 结束语 36
致谢 37
参考文献 38
附录一 前向通道原理图 39
附录二 PLC输入输出连接图 40
附录三 软件部分流程图 41
附录四 实物图 42