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论文编号:DQ062 论文字数:26759,页数:62
摘 要
电力系统的飞速发展对继电保护不断提出新的要求,电子技术、计算机技术与通信技术的飞速发展又为继电保护技术的发展不断地注入了新的活力,因此,继电保护技术正在不断地发展和完善。继电保护的任务就是有选择性地将故障元件从供电系统中快速、自动的切除,使其损坏程度减至最轻,并保证最大限度地迅速恢复无故障部分正常运行。另外,它能反应电气元件的异常运行状态,他可以根据运行维护的具体条件和设备的承受能力,发出警报信号、减负荷或延时跳闸。本论文即是对吴庄变电站供电系统的继电保护现状进行分析研究,得出继电保护的理论基础和整定原则。在现有硬件的基础上,对变电站的继电保护进行系统的优化,最终使供电系统的保护系统的可靠性、选择性、快速性和灵敏性达到最佳状态。
关键词:继电保护、故障、优化
Abstract
The rapid development of Power System Protection put forward new requirements to relay constantly, the rapid development of electronic technology、computer technology end communication technology also inject new vitality for the development of relay technology continuously , therefore, the relay protection technology are developing and improving continuously. The task of protection is that remove fault components from the power supply system selectively, rapid, automatically, which can reduce the extent of damage to the lightest and, to a great, extend ensure trouble-free part of the rapid resumption recover normal operation. In addition, It can react the abnormal running state of electrical components, and according to the specific conditions of operation and maintenance and equipment bear capacity, it can issue a warning signal, reduce load or delay trip. This paper will analysis and research the relay protection status of power supply system of substation of Wuzhuang, which will draw theoretical foundation and setting principles of relay protection. on the basis of the existing hardware, this paper will optimist systematically the relay protection on the substation, in the end, the reliability, selective, rapid and sensitive of protection system of power supply system will be achieved the best condition.
Keywords:relay protection, malfunction,optimization
目 录
摘要……………………………………………………………………………. . .……………..I
1 绪论…………………………………………………………………………………………..1
1.1 毕业设计目的…………………………………………………………………….……1
1.2 毕业设计背景与意义…………………………………………………………….... . .1
1.3 毕业设计内容…………………………………………………………………. . .……1
2 原始材料…………………………………………………………………………………. . .2
2.1 吴庄站基本情况………………………………………………………………….……2
2.2 吴庄站负荷统计(抄表情况)………………………………………………….... ....2
2.3 系统图…………………………………………………………………………. . .……3
2.4 吴庄站继电保护的基本情况…………………………………………………....……3
3 短路电流计算……………………………………………………………………………....6
3.1 短路电流计算必要性………………………………………………………………….6
3.2 吴庄供电系统运行方式确定…………………………………………………………6
3.3 短路电流计算…………………………………………………………………………8
3.3.1 计算各元件的电抗标幺值……………………………………………………..8
3.3.2 短路电流计算…………………………………………………………………..8
4 继电保护的理论基础……………………………………………………………………..14
4.1 继电保护的任务与要求……………………………………………………………. ...14
4.1.1 继电保护的任务与基本原理…………………………………………….........14
4.1.2 对继电保护装置的基本要求………………………………………………….14
4.2 保护继电器……………………………………………………………………………15
4.2.1 保护继电器的分类………………………………………………………….. ...15
4.2.2 常用的电流继电器及其动作特性………………………………………….. ...16
4.3 供电系统单端电流配电线路的保护…………………………………………………17
4.3.1 配电线路的故障形式与保护设置………………………………………….. ...17
4.3.2 带时限电流保护……………………………………………………………......18
4.3.3 动作电流整定………………………………………………………………...20 4.3.4 过电流保护的灵敏度校验…………………………………………………...20 4.4 电流速断保护…………………………………………………………………………21
4.4.1 电流速断保护的构成………………………………………………………...21
4.4.2 速断电流的整定……………………………………………………………...21
4.4.3 电流速断保护的灵敏度……………………………………………………...22
4.5 差动保护…………………………………………………………………………….22
4.5.1 变压器差动保护的基本原理………………………………………………...23
4.5.2 变压器差动保护中的不平衡电流及其减小措施…………………………...23
4.5.3 变压器差动保护的动作电流应满足条件…………………………………...24
5 继电保护优化的理论分析……………………………………………………. . .……26
5.1 概述…………………………………………………………………………………26
5.2 继电保护的优化及整定原则………………………………………………………27
5.2.1 一路运行一路备用的优化保护方案……………………………………....28
5.2.2 系统分裂运行的优化保护方案……………………………………………33
6 吴庄站继电保护的优化…………………………………………………………….......36
6.1 吴庄站继电保护的基本情况…………………………………………………..……36
6.2 吴庄站原继电保护方案的主要技术分析…………………………………………..36
6.3 吴庄站继电保护的优化设计………………………………………………………..37
6.4 吴庄35kV变电站主变压器差动保护………………………………………………40
6.4.1 差动保护整定计算…………………………………………………………..41
6.4.2 吴庄2#变差动保护整定计算………………………………………………43
6.5 吴庄35kV变电站主变压器过流保护………………………………………………43
6.6 6kV出线的过流保护…………………………………………………………………44
7 总结………………………………………………………………………………………...58
致谢…………………………………………………………………………………………. ....59