论文总字数：20815字

摘 要

110kV降压变电所，是配电系统的重要组成部分，其低压侧连接10kV（或6kV配电网），线路多属于终端馈线，线路上接有多台配电变压器，变压器的位置分散、容量不一。这种线路由主干线路与多条分支线路组成。针对相间故障，馈电线路一般配置阶段式电流保护，变压器需配置完善的主保护和后备保护。保护动作的正确与否，直接关系到设备的运行安全和用户的供电可靠性，因此，经过整定计算，给出保护正确合理的定值，是至关重要的环节。同时，备用电源自动投入装置也是提高供电可靠性的重要手段。而备用方式需要根据现场实际情况及备自投工作原理，经分析和研究后才能确定备用方案。本设计针对给定配电网相关运行参数，对变电所内110kV变压器和10kV馈线保护进行保护选型及定值整定，并对分裂运行母线的备自投，设计备用方案和实现逻辑。

关键词：短路计算；整定计算；备自投方案

Design of setting calculation and ATT scheme of relay protection in Dawangcun Substation

Abstract

110kV step-down substation is an important part of the distribution system. Its low-voltage side is connected to 10 kV (or 6 distribution networks), most of the lines belong to the terminal feeder line, and there are many distribution transformers connected on the line. The position of the transformer is scattered and the capacity is different. This line consists of a main line with multiple branch lines. In view of the interphase fault, the feed line is generally equipped with stage current protection, and the transformer needs to be equipped with perfect main protection and backup protection. Whether the protection action is correct or not is directly related to the operation safety of the equipment and the reliability of the user's power supply. The link. At the same time, the automatic input device of backup power supply is also an important means to improve the reliability of power supply. But the standby mode needs to be based on the actual situation of the site and the principle of the standby operation, after analysis and research, the standby scheme can be determined. This design aims at the given distribution network related operation parameters, carries on the protection selection and the fixed value setting to the 110 kV transformer and the 10 kV feeder protection in the substation, and designs the backup scheme and the realization logic to the split operation bus.

Keywords: Short circuit calculation; setting calculation; self-input scheme

目录

摘 要 ........................................................................Ⅰ

Abstract............................................................................II

第一章 绪 论.........................................................................5

1.1 选题的背景和意义.............................................................5

1.2 本论文的主要研究内容.........................................................5

第二章 网络故障分析及保护配置与选型..................................................6

2.1整定对象参数概述..............................................................6

2.1.1 原始参数...............................................................6

2.1.2 计算参数...............................................................7

2.2 故障分析参数计算.............................................................8

2.2.1三相短路................................................................8

2.3.2 两相短路...............................................................9

2.3 大王村变电所Ⅰ段母线参数表..................................................10

2.4 基于PSCAD软件的10kV配电系统故障分析.........................................11

2.4.1一次系统模型构建.......................................................11

2.4.2参数设计...............................................................11

第三章 馈线保护整定计算 .............................................................11

3.1 线路L2、L1整定过程..........................................................12

3.1.1 线路L2无时限电流速断保护（Ⅰ段）......................................12

3.1.2 线路L2过电流保护（Ⅲ段）..............................................14

3.1.3 线路L1无时限电流速断保护（Ⅰ段）......................................12

3.1.4 线路L1限时电流速断保护（Ⅱ）段........................................13

3.1.5 线路L1过电流保护（Ⅲ段）..............................................14

3.2 大王村变电所馈线保护整定定制单..............................................15

第四章 小电流接地系统接地短路分析及监测.............................................18

4.1 中性点非直接接地电网时零序分量的特点........................................18

4.2中性点不接地电网的接地保护...................................................19

第五章 变压器保护整定计算...........................................................20

5.1保护配置及动作逻辑...........................................................20

5.1.1保护配置...............................................................20

5.1.2保护逻辑图.............................................................20

5.2变压器保护整定...............................................................21

5.2.1瓦斯保护...............................................................21

5.2.2 差动保护..............................................................21

5.2.3 后备保护..............................................................22

5.2.4 过负荷保护............................................................22

5.2.5 零序电流电压保护......................................................22

5.3 大王村变电所变压器继电保护定值单............................................23

第六章 备自投配置及实现.............................................................24

6.1备自投装置及动作逻辑.........................................................24

6.1.1保护装置...............................................................24

6.1.2备用电源自投逻辑.......................................................24

6.2备自投整定计算...............................................................25

6.2.1备用电源自动投入部分...................................................25

6.2.2过电流Ⅰ段.............................................................25

6.2.3过电流加速段保护.......................................................25

6.2.4充电保护...............................................................26

6.3大王村变电所备自投母线分段保护整定定值单.....................................26

第七章 结束语.......................................................................27

谢 辞...................................................................28

参考文献 ..........................................................................29

附录............................................................................30

第一章 绪 论

选题的背景和意义

110kV降压变电所，是配电系统的重要组成部分，其低压侧连接10kV（或6kV配电网），线路多属于终端馈线，线路上接有多台配电变压器，变压器的位置分散、容量不一。这种线路由主干线路与多条分支线路组成。针对相间故障，馈电线路一般配置阶段式电流保护，变压器需配置完善的主保护和后备保护。保护动作的正确与否，直接关系到设备的运行安全和用户的供电可靠性，因此，经过整定计算，给出保护正确合理的定值，是至关重要的环节。同时，备用电源自动投入装置也是提高供电可靠性的重要手段。而备用方式需要根据现场实际情况及备自投工作原理，经分析和研究后才能确定备用方案。

本论文的主要研究内容

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