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ID:14772429
大小:1.24 MB
页数:62页
时间:2018-07-30
《毕业设计(论文)-采用半屋内gis配电装置的tq化肥厂110kv降压变电所设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、采用半屋内GIS配电装置的TQ化肥厂110kV降压变电所设计摘要变电站是电力系统的重要组成部分,它直接影响整个电力系统的安全与经济运行,是联系发电厂和用户的中间环节,起着变换和分配电能的作用。电气主接线是发电厂变电所的主要环节,电气主接线的拟定直接关系着全所电气设备的选择、配电装置的布置、继电保护和自动装置的确定,是变电站电气部分投资大小的决定性因素。本次设计建设一座采用屋内GIS配电装置的TQ化肥厂110kV降压变电所。首先,根据主接线的经济可靠、运行灵活的要求选择各个电压等级的接线方式,在技术方面和经济方面进行比较,选取灵活的最优接
2、线方式。其次进行短路电流计算,根据各短路点计算出各点短路稳态电流和短路冲击电流,从三相短路计算中得到当短路发生在各电压等级的工作母线时,其短路稳态电流和冲击电流的值。最后,根据各电压等级的额定电压和最大持续工作电流进行设备选择,然后进行校验。同时在设计过程中还要进行主变继电保护的整定计算和防雷保护的设计,以保证本变电所能可靠安全的运行。关键词:降压变电所变压器电气主接线短路电流设备选择防雷继电保护-61-采用半屋内GIS配电装置的TQ化肥厂110kV降压变电所设计AbstractSubstationisanimportantpartof
3、thepowersystem,whichdirectlyaffectstheentirepowersystem'ssecurityandeconomicoperation.It’sthemiddleparttocontactpowerplantsandtheuser,whichplaystheroleoftransformationanddistributionofelectricenergy.Electricalpowermainconnectionisthemajorcomponentofplantsubstation.Thedev
4、elopmentofmainpowerlineisdirectlyrelatedtothechoiceofalltheelectricalequipment,powerdistributionequipmentlayout,relayprotectionandautomaticdeviceidentification,whichispartofthesizeofinvestmentoftheelectricalsubstationdecisivefactor.Thisdesignisapowerdistributionwiththeho
5、use'sTQGIS110kVstep-downsubstationforfertilizerplant.First,accordingtotheeconomicandreliableoperationandflexiblerequirementsofthemainpowerlineitwillselectvariousvoltagelevelsofwiring,andaftertechnicalandeconomicaspectsinthecomparison,theoptimalflexiblewiringshouldbeselec
6、ted.Second,theshort-circuitcurrentcalculates.Accordingtothepointsitcalculatesshortcircuitcurrentandsteady-stateimpactofshort-circuitcurrent,anditssteady-statecurrentandtheimpactofshort-circuitcurrentvalueisobtainedfromthethree-phaseshort-circuitcalculationwhenshort-circu
7、itoccursintheworkingbusofeveryvoltagelevel.Finally,accordingtothevoltageleveloftheratedvoltageandmaximumcontinuousoperatingcurrent,equipmentwillbeselected,andthenchecked.Atthesametimeinthedesignprocessthemaintransformer’srelayprotectionsettingcalculationanddesignoflightn
8、ingprotectionwillbedonetoensurethesafetyofthereliableoperationofsubstation.Keywords:Step-downsubstation
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