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I本科生毕业论文某机械厂供用电设计Machineryfactorypowersupplydesign学生姓名李继亮专业电气工程及其自动化教学点深圳真彩申请学位指导教师李一峰职称副教授答辩时间年月日II目录摘要.............................................................IVABSTRACT............................................................V某机械厂供用电设计..................................................1第一章绪论........................................................11.1课题设计背景.................................................11.2工厂供电设计的一般原则.......................................21.3工厂供电设计内容及步骤.......................................2第二章负荷计算和功率补偿..........................................52.1负荷计算的内容和目的.........................................52.2负荷计算的方法...............................................5第三章变压器容量和数量的选择......................................6第四章主接线方案的选择............................................74.1对变电所主结线的一般要求.....................................74.2变电所主结线.................................................74.2.1单电源进线的变电所主接线...............................84.2.2双回电源进线变电所主接线...............................8第五章短路电流的计算.............................................125.1短路电流计算的目的及方法....................................125.2三相短路电流计算............................................12第六章导线、电缆的选择...........................................156.1导线电缆的使用条件.........................................156.2导线电缆的选择.............................................15第七章电气设备的选择.............................................187.1电气设备选择的一般原则......................................187.2高压开关电器的选择..........................................187.2.1高压断路器的选择......................................187.2.2高压隔离开关的选择....................................197.2.3电流互感器的选择......................................197.3配电所高压开关柜的选择......................................20第八章变压器的继电保护...........................................218.1概述........................................................218.2变压器电流保护的接线方式....................................228.3继电保护配置................................................228.3.1变压器的过电流保护....................................228.3.2变压器的电流速断保护..................................23第九章二次回路操作电源和中央信号回路.............................279.1二次回路的操作电源..........................................27III9.2中央信号回路................................................279.2.1概述..................................................279.2.2对中央信号回路的要求..................................27第十章测量和绝缘监视回路.........................................2910.1测量仪表的配置.............................................2910.2绝缘监视装置...............................................29第十一章防雷和接地...............................................3111.1过电压及雷电概述...........................................3111.2防雷.......................................................3111.2.1防雷设备.............................................3111.2.2防雷保护措施.........................................3111.3电气装置的接地.............................................3311.3.1接地概述.............................................3311.3.2接地电阻.............................................33结论..............................................................36参考文献...........................................................37附录A：10KV供电系统图.............................................38附录B：低压供电系统图.............................................39附录C：变压器二次电路图...........................................40附录D：电压互感器二次电路图.......................................41附录E：接地避雷平面图............................................42鸣谢..............................................................43IV摘要本毕业设计为某机械厂供用电设计，对在工厂变电所设计中的若干问题：负荷计算，三相短路分析，短路电流计算，高低压设备的选择与校验，变压器的继电保护，变电所二次回路及自动装置，防雷与接地，变电所的过电压保护，计量，无功补偿等几方面的设计进行了陈述，并对供电主接线的拓扑结构进行了阐述。该厂变电所采用10kV单电源进线，采用一台1600kVA的主变压器，最大设备容量1636kW，采用并联电容器进行低压集中补偿，对变压器进行过电流，电流速断，瓦斯保护，按三类防雷建筑物设防，采用强弱电联合接地系统对建筑物进行保护。在对供电系统短路计算的基础上，进行电力电缆和电气设备的选择设计，同时也对户外平面布置进行了初步的设计。关键词：工厂供配电；继电保护；防雷与接地；负荷计算VABSTRACTThisgraduationprojectisdesignedforthefactorytransformersubstation,tocertainquestionsinfactorytransformersubstationdesign:theloadcomputation,theanalysisofthree-phaseshort-circuits,theshort-circuitcurrentcomputation,thechoiceandverificationofhighandlowpressureequipment,thetransformerrelayprotection,thesecondarycircuitofthetransformersubstationandtheautomaticdevice,anti-thunderandtheconnectiontotheearth,thetransformersubstationovervoltageprotection,themeasurement,theidleworkcompensatedandsoon,Alltheaboveaspectsandthestructureofthepowersupplyhostwiringtopologyhavebeenstated.Thetransformersubstationwitha10kVsinglepowersourcecoilinituses1600kVAmaintransformer,thebiggestcomputationshouldersofwhichis1636kW.Itadoptstheshuntedcapacitortocarryonthelowpressurecentralismforcompensationandsetsprotectionforthetransformerbycarringontheelectriccurrenttoitbreakingthespeedoftheflowgasprotection,garrisonsaccerdingtothethirdkindofanti-thunderbuildings,andusersthestrongandweakelectricityunionearthsystemtocarryontheprotectiontothebuilding.Basedonthecomputationofshort-circuitstothepowersupplysystem,theprojecthasachoicedesignofthepowercableandtheelectricalequiomentandapreliminarydesigntotheoutdoorsplanearrang