搜索
-I-摘要本次设计的内容为110kV变电站一次及二次系统的的设计。本篇论文主要针对变电站设计过程中的负荷的统计与计算，电气主接线方案的提出与确定，短路电流的计算，电气设备的选择及校验，继电保护，二次接线，防雷保护等方面进行了论述。在本次设计中，为了尽可能使设计贴近实际生活，查阅和参考了大量资料，请教了多位老师，最终完成了本次设计。在我国始终存在一个严重的问题：绝大部分的供电网络基础比较薄弱，但是供电的半径却由于地理原因而很长，造成的结果就是电力在线路上传输时的损耗较大，导致的结果就是传输到线路末端时用户的电压过低，从而对人民的正常的生产和生活影响。为了满足人民生活用电兼顾工农业发展，所以本次设计选择了设计一座110kV变电站。本变电站主要用于负担地方性负荷，包含的负荷区域内大部分负荷均为三类负荷，其余只有一处为二类负荷，为了保证供电的稳定性和可靠性，设计中尽可能选用电气性能好的新型设备，同时为了兼顾经济性的原则，选用的设备在保证性能的同时应尽可能选择价格合适的设备。110kV单回路进线，本变所有一处二类负荷，其余均为三类负荷，生活用电和工业负荷比重较大，共有8条10kV出线。本变电所装设两台等容量主变，主变采用双绕组变压器SF7−10000110⁄型变压器。断路器型号根据系统要求及安装地点综合选择ZN5−10630⁄型，电压互感器同样根据额定电压和用途、安装地点综合考虑选择JDZX-10型电压互感器。10kV侧的电力电容器按照规程的要求需要装设过电压保护以及无时限过电流装置。而在10kV的出线处，同样按要求需要安装速断保护和过电流保护。主变压器处按规程要求需要安装过电流、过负荷保护，瓦斯保护以及电流速断等保护。关键词：110kV变电所；主接线；电气设备；继电保护-II-Designofprimaryandsecondarysystemof110kVsubstationAbstractThedesignofthe110kVsubstationfortheprimaryandsecondarysystemdesign.Thispapermainlyfocusesonthestatisticsandcalculationoftheloadinthesubstationdesignprocess,theformulationanddeterminationofthemainelectricalwiringscheme,thecalculationoftheshortcircuitcurrent,theselectionandverificationoftheelectricalequipment,therelayprotection,thesecondarywiring,thelightningprotectionAspectswerediscussed.Inthisdesign,inordertomakethedesignascloseaspossibletotheactuallife,accessandreferencealotofinformation,askanumberofteachers,andultimatelycompletedthisdesign.Thereisalwaysaseriousprobleminourcountry:thevastmajorityofthepowersupplynetworkisrelativelyweak,buttheradiusofthepowersupplyislongduetogeographicalreasons,theresultisthepowertransmissiononthelinewhenthelossislarge,resultingintheresultisthetransmissionTotheendofthelinewhentheuser'svoltageistoolow,thusthepeople'snormalproductionandlifeimpact.Inordertomeetthepeoplelivingelectricitycombinedwithindustrialandagriculturaldevelopment,sothisdesignchosetodesigna110kVsubstation.Thesubstationismainlyusedtobearthelocalload,includingtheloadareaofthemajorityoftheloadarethreetypesofload,andtheremainingonlyoneforthesecondclassload,inordertoensurethestabilityandreliabilityofpowersupply,thedesignasmuchaspossibletouseelectricalperformanceGoodnewequipment,andinordertotakeintoaccounttheprincipleofeconomy,thechoiceofequipmenttoensuretheperformanceatthesametimeasmuchaspossibletochoosetherightpriceequipment.110kVsingleloopintotheline,thechangeofallthetwotypesofload,therestarethreetypesofload,theproportionofdomesticelectricityandindustrialloadlarger,atotalofeight10kvoutlet.Thesubstationinstalledtwoequal-capacitymaintransformer,themaintransformerdual-windingtransformerSF7−10000110⁄typetransformer.BreakertypeAccordingtothesystemrequirementsandinstallationlocationComprehensiveselectionZN5−10630⁄type,thevoltagetransformeralsoaccordingtotheratedvoltageanduse,installationsitetoconsiderthechoiceofJDZX-10-typevoltagetransformer.10kVsideofthepowercapacitorinaccordancewiththerequirementsoftherequirementsoftheinstallationofover-voltageprotectionandnotimelimitovercurrentdevice.Andinthe10kVoutlet,thesamerequirementsasrequiredtoinstallquick-breakprotectionandover-currentprotection.Themaintransformeraccordingtotheregulationsrequiretheinstallationofover-current,overloadprotection,gasprotectionandcurrentquick-breakprotection.Keywords:110kVsubstation;mainwiring;electricalequipment;relayprotection-III-目录摘要..............................................................................................................................................IABSTRACT.....................................................................................................................................II1前言.........................................................................................................................................-1-1.1变电站一次及二次设备的发展.........................................................................................-1-1.1.1变电站一次设备的发展.................................................................................................-1-1.1.2变电站二次的发展.........................................................................................................-1-2设计说明书..............................................................................................................................-3-2.1负荷统计表.........................................................................................................................-3-3电气主接线设计......................................................................................................................-4-3.1方案的提出.........................................................................................................................-4-3.2两种方案之间的比较.........................................................................................................-4-4负荷计算与主变压器的选择..................................................................................................-5-4.1负荷计算.............................................................................................................................-5-4.2变电所最大负荷计算.......................................................................