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1、毕业设计(论文)110kV变电站的初步设计摘要根据对原始资料背景和设计要求的分析,110kV变电站初步设计的主要内容包括:先试选电气主接线方案,然后进行技术性和经济性的比较,最终选择最合理的主接线形式;通过经济截面电流法,先选择变电所进线导线,为后续三相短路电流计算做铺垫;根据三相短路电流计算结果,选择符合使用要求的各种电气设备;最终是对变压器、线路进行保护。通过综合分析,110kV侧入线是双电源供电,35kV和10kV母线选择的都是单母线接线。导线选择后,采用标幺值法计算等效电抗,通过查电源运算曲线的图表,找出短路瞬间、4s后的短路
2、电流标幺值,而后将其转换成有名值,通过公式计算出冲击电流。至于电气设备的选择则是通过最大负荷电流和开断电流进行选择,根据4s后电流有名值和短路冲击电流有名值进行热稳定性和动稳定性校验;至于保护方面,主要是变压器的保护,通过延时时间不同,来让不同断路器动作,进而起到保护作用。关键词:电气主接线,三相短路电流,变压器,线路保护,标幺值PRELIMINARYDESIGNOF110kVSUBSTATIONABSTRACTAccordingtotheanalysisofrawdatabackgroundanddesignrequirements
3、,themaincontentofthepreliminarydesignofthe110kVsubstationincluding:Trytochoosethemainelectricalwiringscheme,thencarriesonthetechnicalandeconomicalcomparison,andfinallychoosethemostappropriateformofthemainwiring.Throughtheeconomicalsectioncurrentmethod,choosethesubstatio
4、nintolineconductor,whichwillpaveforthesubsequentthree-phaseshort-circuitcurrentcalculation.Accordingtotheresultsofthethree-phaseshort-circuitcurrentcalculationtochooseallkindsofelectricalequipment,whichconformtotherequirements.Transformerandlineareultimatelytobeprotecte
5、d.Throughthecomprehensiveanalyse,thesideintolineof110kVisdoublepowersupply,while35kVand10kVbusbarselectionaresinglebusbarwiring.Usestandardperunitmethodtocalculatetheequivalentreactanceafterselectingwire,andtofindouttheperunit'sshort-circuitcurrentvalueofshortcircuitins
6、tantaneousandafter4s’throughcheckingthepoweroperationcurvechart,andthenconvertthemintoactualvalue,calculatetheshockcurrentbasedontheformula.Asfortheselectionofelectricalequipment,whichisthroughthechoiceofmaximumloadcurrentandopencircuitcurrent,carriesonthethermalstabili
7、tyanddynamicstabilitycheckaccordingtotheafter4s’currentactualvalueandshortcircuitimpactcurrentactualvalue.Theprotectionoftransformerismainlyinprotection,whichprotectsfurtherthroughthedifferentdelaytimetomakethedifferentcircuitbreakeraction.KEYWORDS:mainelectricalwiring,
8、three-phaseshort-circuitcurrent,transformer,lineprotection,perunit目 录前 言1第1章原始资料分析及变压器的选择21.1原始资料简介及分析21.1.1原始