某机械厂供电系统设计

辽宁科技大学本科生毕业设计（论文）辽宁科技大学本科生毕业设计（论文）I某机械厂供电系统设计摘要本次设计题目为某机械厂供配电系统设计，该系统通过降压变压器与10kv公共电源干线相连，然后向工厂供给电能。本次设计主要内容包括：负荷计算、短路电流计算、变电所选址及变压器选择、电气设备的选择和校验、继电保护装置的选择以及过电压及防雷。在设计的过程中，本人参阅了大量的供配电系统设计、变配电所设计、建筑电气设计规范等相关的规范和设计手册，最后对该工厂供配电系统进行了初步设计。本设计为毕业设计，其目的是通过设计实践，综合运用所学知识，理论联系实际，锻炼独立分析和解决电气设计问题的能力，为未来的工作奠定坚实的基础。关键词：负荷计算；短路电流计算；变压器；一次设备；继电保护；防雷辽宁科技大学本科生毕业设计（论文）IIAmachineryfactorysupplysystemsdesignAbstractThisdesigntopicisthepowersupplyanddistributionsystemforamachineryfactoryofAcity,thissystemisconnectedwiththepubliclineof10kVthroughstep-downtransformers,anddistributeelectricalpowertoAmachineryfactoryofAcity.Thisdesignmaincontentincludes:thechargecomputation,short-circuitcurrentcomputation,substationsiteandtransformerselection，selectionandverificationofelectricalequipment，selecttheprotectiondevice，overvoltageandlightningprotection,thedisposalandconfigurationofthetransformersubstationdesign.Inordertofinishthedesign,Ireferringtothepowersupplyanddistributiondesignstandard,thetransformersubstationdesignstandard，theelectricaldesignstandardofarchitectureandsoon,carryonthepreliminarydesigntothispowersystem.Thisdesignisagraduationdesign.Thepurposeofthisdesignistogiveusachanceofsyntheticalusageoftheknowledgewehavelearned.Besides,itcantrainourabilitytoanalyzeandsolvepracticalproblemsinConstructelectricityindependentlysothatthetheoryisconnectedwithpracticeandasolidbaseismadeinfavoroffuturework.Keywords:LoadCalculation；Shortcircuitcalculation；transformer；Equipmentselection；relayprotection；Lightningprotection辽宁科技大学本科生毕业设计（论文）III目录1绪论.........................................................................................................................................................11.1工厂供电概述............................................................................................................................11.2工厂供电的意义和要求..........................................................................................................11.2.1工厂供电的意义...............................................................................................................11.2.2工厂供电的要求...............................................................................................................21.3工厂供配电系统的特点..........................................................................................................21.4工厂原始资料............................................................................................................................22供配电系统负荷计算和无功功率补偿...............................................................................52.1负荷计算的内容和目的............................................................................................................52.2电力负荷的分级..........................................................................................................................52.3负荷计算的方法..........................................................................................................................52.4各车间负荷计算..........................................................................................................................62.5无功功率补偿.............................................................................................................................113变电所的选址及主变压器的选择.......................................................................................123.1变配电所所址选择...................................................................................................................123.1.1选取变配电所址的一般性原则.................................................................................123.1.2变配电所的总体布置...................................................................................................123.2变压器的选择............................................................................................................................133.2.1变压器台数的选择.......................................................................................................133.2.2变电所主变压器容量的选择.....................................................................................133.3变压器的功率损耗...................................................................................................................143.3.1变压器的有功功率损耗..............................................................................................143.3.2变压器的无功功率损耗..............................................................................................144短路电流及其计算.......................................................................................................................164.1概述..............................................................................................................................................164.1.1短路及其原因....................................................................................................164.1.2短路的后果及短路计算的目的.................................................................................164.1.3短路的形式.....................................................................................................................174.2短路电流的计算方法...........