35kV电网继电保护精.docx

35kV电网继电保护精.docx

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35kV电网继电保护精

西安航空职业技术学院毕业设计（论文

论文题目:

35Kv电网继电保护设计所属系部:

自动化工程系

指导老师:

张桂金职称:

教师专业:

电气自动化

西安航空职业技术学院制

年月日

毕业设计（论文任务书题目:

35Kv电网继电保护设计

任务与要求:

短路电流计算:

电网继电保护配置设计;输电线路继电保护设计三部分

分阶段写说明书一份,画硬件设计电路图（包括继电保护回路展开式原理图及设备表。

时间:

年月日至年月日共周

所属系部:

自动化工程系

学生姓名:

宋科学号:

18

专业:

电气自动化

指导单位或教研室:

指导教师:

张桂金职称:

教师

西安航空职业技术学院制

年月日

毕业设计（论文进度计划表

本表作评定学生平时成绩的依据之一。

35KV电网继电保护设计

【摘要】

本次继电保护设计是35KV电网继电保护设计（多电源环网,单侧电源线路保护整定。

本次设计中采用WXB—11C型微机保护对电网进行保护,首先介绍了电力系统继电保护的基础知识,然后根据给定35KV电网的接线图及参数,进行短路电流计算,制定出反应其输电线路上相间短路、接地短路故障的继电保护配置方案。

通过对所配置的继电保护进行整定计算和校验,论证继电保护配置的正确性。

并加装自动重合闸装置,提高供电可靠性。

关键词:

短路电流计算;电网继电保护;输电线路继电保护;重合闸

Abstract

Thisdesignis35KVelectricgridprotectiondesign（multi-powersourcesloop,singlesidepowersourcelineprotectionsetting.InthisdesignusingWXB-11Cmicrocomputerprotectionprotectstheelectricalnetwork.Firsttheelectricalpowersystemprotectionelementaryknowledgeisintroduced.thenaccordingtothewiringdiagramandtheparameterofthe35KVelectricalnetwork,theshort-circuitcurrentiscalculated.Protectionequipmentplanreflectingphasefaultandearthfaultonthetransmissionlinearedetermined.Throughsettingcalculationandverificationofprotectionequipped,accuracyofprotectionequipmentisproved.Inordertoimprovepowersupplyreliability,reclosingisequipped.Thebasisofthesettingvaluesworkedout,thedefinitevaluelistsofmicrocomputerprotectionarecompleted.

Keywords:

protection;short-circuitcurrentcalculation;reclosing

目录

1概述..................................................................................................................................................................11.1电力系统继电保护的作用........................................................................................................................11.2电力系统继电保护技术与继电保护装置..............................................................................................1

1.2.1继电保护技术要求...............................................................................................................................11.2.2继电保护装置........................................................................................................................................11.3继电保护的基本要求.................................................................................................................................11.4电网继电保护的设计原则........................................................................................................................21.4.135kV线路保护配置原则.....................................................................................................................21.4.235kV母线保护配置原则.....................................................................................................................21.4.335kV断路器保护配置原则................................................................................................................2

2系统中各元件的主要参数计算.....................................................................................................................32.1标幺制及标幺值计算方法........................................................................................................................32.1.1标幺制的概念.......................................................................................................................................32.12标么值的折算.........................................................................................................................................32.2、双绕组变压器的参数计算.....................................................................................................................32.3绕组变压器的参数计算.............................................................................................................................42.3.1电阻参数计算..................................................................................................................................42.3.2电抗参数计算.....................................................................................................................................4

2.4输电线路参数的计算.............................................................................................................................4

3中性点接地的选择.......................................................................................................................................53.135KV中性点直接接地电网中线路的保护............................................................................................53.2高频保护整定时考虑的几个问题...........................................................................................................53.2.1、高频信号注意事项.........................................................................................................................53.3高频闭锁距离保护的整定计算...............................................................................................................63.3.1距离保护各段的整定计算............................................................................................................6

4短路电流的计算................................................................................................................................................84.1三相短路电流计算......................................................................................................................................8

4.2两相短路电流计算......................................................................................................................................9

5继电保护整定（以下电流值的单位为:

KA;电压值的单位为:

KV。

...............................105.1对保护5进行整定计算...........................................................................................................................115.1.1保护5的Ⅰ段..................................................................................................................................115.1.2保护5的Ⅱ段..................................................................................................................................115.1.3保护5的Ⅲ段..................................................................................................................................125.2护3进行整定计算....................................................................................................................................125.2.1保护3的Ⅰ段..................................................................................................................................125.2.2保护3的Ⅱ段..................................................................................................................................125.2.3保护3的Ⅲ段..................................................................................................................................135.3对保护1进行整定计算...........................................................................................................................13

5.3.1保护1的Ⅰ段..................................................................................................................................135.3.2保护1的Ⅱ段..................................................................................................................................135.3.3保护1的Ⅲ段..................................................................................................................................135.4对保护2进行整定计算...........................................................................................................................145.4.1保护2的Ⅰ段..................................................................................................................................145.4.2保护2的Ⅱ段..................................................................................................................................155.4.3保护2的Ⅲ段..................................................................................................................................155.5、对保护4进行整定计算.......................................................................................................................155.5.1保护4的Ⅰ段..................................................................................................................................155.5.2保护4的Ⅱ段..................................................................................................................................165.5.3保护4的Ⅲ段..................................................................................................................................165.6对保护6进行整定计算...........................................................................................................................175.6.1保护6的Ⅰ段..................................................................................................................................175.6.2保护6的Ⅱ段..................................................................................................................................17

5.6.3保护6的Ⅲ段..................................................................................................................................17

6短路电流计算说明书...............................................................................................................................196.1三相短路电流计算....................................................................................................................................196.2两相短路电流计算....................................................................................................................................216.2.1两相短路电流负序电抗化简.........................................................................................................236.3继电保护整定.............................................................................................................................................256.3.1方向元件的设置...............................................................................................................................266.3.2整定原则..........................................................................