220kV变电站电气一次部分译文.docx
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220kV变电站电气一次部分译文
英文翻译（译文）
英文名称Applicationguideforthechoiceofprotectiverelays
中文名称电气主接线设计方案及确定
学生姓名
学号
系、年级专业电气工程系、10电气工程及其自动化
指导教师
职称
年2月20日
Themainelectricalwiringdesignanddetermined
Substationmainelectricalwiringisanimportantpartofpowersystemwiring.Thedeterminationofthemainwiring,flexible,andthesafetyofthepowersystemstability,economicoperationandtheselectionofelectricalequipmentinsubstation,powerdistributionequipmentarrangementwillhavedirectimpact,etc.
one,thedesignprincipleofmainwiring:
Inthedesignofthemainconnectionmode,shouldconsiderthefollowing:
Thepositionandroleofthe
（1）substationinthesystem.
（2）sizeofimmediateandlong-termdevelopment.Theimportanceoftheloadclassificationandqualificationtocounthowmanyeffectsonthemainwiring.（3）theinfluenceofthemaintransformerstationsonthemainwiring.（4）iftherearesparecapacityandsizeoftheinfluenceofthemainwiring.
Second,themainwiringdesignrequirements:
1,reliability:
（1）whenthecircuitbreakermaintenance,cannotaffectthepowersupply.2lines,circuitbreaker,busfaultandmaintenance,thebeijing-kowloonrailwaylinebacktothenumberandlengthoftime,andcanguaranteethepowersupplytoimportantusers.（3）thepossibilityofallpowersubstation.（4）tomeettherequirementsofthepowersupplyreliabilityindexoftheuser.
2,flexibility:
（1）schedulingrequirements.Theflexibilityofinputandremovaloftransformers,lines,allocatethepowerandload,cansatisfythesystemoperationandmaintenanceoftheaccidentwayandspecialoperationschedulingrequirements.2maintenancerequirements.Easytoshutdownthecircuitbreaker,busandrelayprotectionequipmentsafetymaintenance,anddoesnotaffectandpowersupply.（3）theexpansionoftherequirements.Shouldleaveroomfordevelopment,isadvantageousfortheexpansion.
3,economy:
（1）investmentprovinces;Theessaycoversanareaofsmall;
（2）powerlossissmall.
Third,proposedthemainwiringscheme
Accordingtotheaboverequirementsandthedesignspecificationrequirements,preliminaryselectionmainwiringisasfollows:
Rawmaterial:
Substationtype:
step-downsubstation
10kVvoltageclass:
110/35/
Qualification:
110kVlinetwice,35kVline8（overhead）,10kVline9
Electricityloadcategories:
industrialandagriculturalproductionandlife
Accordingtothedataprovidedbytheoriginaldata,weightheadvantagesanddisadvantagesofallkindsofconnectionmode,willbelistedforeachvoltagegradeofmainconnectionmode:
Twiceforonly1,110kV,andasastep-downsubstation,110kVsidenoexchangeoftrend,bothbacklinecansupplypowertosubstationcanalsobetimetosubstationpowersupply,theotheroneasstandbypower.So,tobedecidedfromthereliabilityandeconomy,110kVpartapplicableconnectionwayforthemotherandtwosinglebusbarsection.
35kVcanhavesinglebussectionandsinglebusbarsectionbesidethemother.
Part3,10kVsinglebusbarsection.So,fortwomainwiringscheme:
SolutionI:
110kVbyasinglemotherofsegmentedwiring,35kVbussectionbythesinglewiring,10kVsinglebusbarsectionconnection.
SchemeII:
110kVdoublewiring,35kVbussectionbythesinglemotherbesidewiring,10kVsinglebusbarsectionconnection.
ThepaintschemeI,IIwiringdiagramisasfollows
ThesolutionIwiringdiagram:
SchemeIIwiringdiagram:
Four,thedeterminationofthemainwiringscheme
Obtainingthereliabilityofthemainwiringschemecomparison:
110kVside:
PlanI:
thesinglemotherof,whenalinefaultorremove,doesnotaffectthetransformeroperation,uninterruptedpowersupply;Mothercircuitbreakerisoffline,twoloopwillsolutioncolumn,uninterruptedpowersupply.Andthewiringsimpleandclear,allthepossibilityoflosingelectricityissmall,lesserror-prone.
SchemeII:
usingdoubleboxwiring,highreliability,lowfailurerateoftransformerexportsdonotinstallthebreaker,investmentintheprovince,thewholecircuithasahighdegreeofflexibility,whentwosetsofdoublebusbarbusbarworkatthesametime,throughthebuscouplercircuitbreakerparalleloperation,powersupplyandtheaverageloaddistributiononthebus,thetwogroupsafterthebuscouplercircuitbreakerdisconnect,canatthesametimeinthebusorvicebusbarsubstationload,whenbusbarfaultormaintenance,pourdisconnectoroperationbrakeoperation,easytowrongoperation.
35kVside:
SolutionI:
singlebussectionconnection,maintenanceandrepairanycircuitbreaker,thecircuitshouldbesuspended,suspendedsectionswitch,twopiecesofbusbarissolutionslistedoperation,whenabusfails,thesectionswitchautomaticallyfaultsegmentresection,guaranteethenormalperiodofbusfromlosingelectricity,theotherabusontheotherlineneedtoshutdown.
SchemeII:
singlebussectionwithbypasswiring,maintenanceandrepairanycircuitbreaker,canbesubstitutedforthebypasscircuitbreaker;Whenanybusbartroubleshooting,thebypasscircuitbreakercanonlybethegenerationtimelinerunning,thissectionofthebusontheotherlinewillneedtoshutdowntheisolatingswitchoperationbrakeoperation,easytowrongoperation.
10kVside:
astheconnectionmodeissamewiththetwomethods,sodon'tcompare.
Denominatedintheflexibilityofmainwiringschemecomparison
SchemeII:
theoperationiscomplex,dispatchingoperationiscomplex,buttheflexibilitytoinputandremovalofthetransformerandline,cansatisfytheoperatingmodeoftheaccident,themaintenancemethodandspecialoperationschedulingrequirements,iseasytoexpand.
10kVside:
thesamewiththetwomethods.
Aneconomicalcomparisonofmainwiringscheme
Comparetwoschemeisthemainequipmentlistisasfollows:
project
plan
Themaintransformer（Taiwan）
110kVcircuitbreaker（Taiwan）
110kVdisconnectingswitch（a）
35kVcircuitbreaker（Taiwan）
35kVdisconnectingswitch（a）
10kVequipment
I
2
5
12
3
6
Thesame
II
2
5
18
4
9
Thesame
Canbeseenfromthechart,theplanIlessthansixschemeIIisolatingswitch,35kVdisconnectorschemeIlessthan3schemeIIcircuitbreakeraless,plancoversanareaofrelativelylessInointerbus（35kVside）,sosaidIthanschemeIIcomprehensiveinvestmentmuchless.
Throughthedeterminationofthemainwiringscheme
ThecomprehensivecomparisonoftheI,IIlist,correspondingtocomparetheirreliability,flexibilityandeconomy,chooseafinalplan（for10kVsideisthesamewiththetwomethods,donotcompare）.
project
plan
SchemeI.
SchemeII
reliability
Asimpleandclear,lessequipment
2,35kVbusfaultormaintenance,willleadtobring3onthebusbacktofullstop
Anyofthethreemaintransformeror110kVlinestoppage,shallnotaffectothercircuitsshutdown
4differentvoltagegradelikelyalltheoutageprobabilityisnotbig
5easyoperation,smallprobabilityofwrongoperation
Asimpleandclear,equipment
235kVbusmaintenance,thebypasscircuitbreakertogenerationofthelineonthebus,userstoimportant,anycircuitbreakermaintenance,arewithoutpower
Anyofthethreemaintransformeror110kVlinestoppage,shallnotaffectothercircuitsshutdown
4alltheoutageprobabilityissmall
5operationisrelativelysimple,theprobabilityofwrongoperation
flexibility
1simpleoperationmode,schedulingflexibility
2isadvantageousfortheexpansionanddevelopment
1operatescomplex,cumbersomeoperation,especiallyin35kV
2isadvantageousfortheexpansionanddevelopment
economy
1highvoltagecircuitbreaker,lessinvestmentisrelativelyless
2areaisrelativelysmall
1equipmentinvestmentismorethantheplanIrelatively
2coversanareaofrelativelylarge
Ontheeconomythroughtheabovecomparison,theschemeisfarbetterthanthatoftheII,IIIschemeisbetterthanthatoftheithonreliability,flexibilityintheithsolutionsismuchlessthantheII
Thesubstationisastep-downsubstation110kVbuswithoutcrossingpower,singlebussectionconnectionisbetterthanthedoublebox.Andbecause35kVand10kVVloadelectricity,fortheproductionofindustryandagriculture,urbanandrurallifeinthepowersupplyreliabilityrequirementsisnottoohigh,evenifthereisademanding,now35kVand10kVforSF6andvacuumcircuitbreaker,poweroutageoverhaulofodds,coupledwiththepowergridismoreandmoreperfect,theimplementationofthedualpowersupplyscheme,theschemeIcancompletelymeettherequirementsonreliability,IIsolutiontoincreaseinvestmentinsomeunnecessary.
Throughcomprehensiveanalysis,decidedtochoosetheplanforthefinal,Inamely110kVsystemadoptssinglemothersegmentedwiring,35kVsystemwithsinglemotherpiecewiseconnection,10kVsystemforsinglebussection.
电气主接线设计方案及确定
变电所电气主接线是电力系统接线组成的一个重要部分。
主接线的确定，对电力系统的安全、灵活、稳定、经济运行以及变电所电气设备的选择、配电装置的布置等将会产生直接的影响。
一、主接线的设计原则：
在进行主接线方式设计时，应考虑以下几点：
⑴变电所在系统中的地位和作用。
⑵近期和远期的发展规模。
负荷的重要性分级和出线回数多少对主接线的影响。
⑶主变压器台数对主接线的影响。
⑷备用容量的有无和大小对主接线的影响。
二、主接线的设计要求：
1、可靠性：
⑴断路器检修时,能否不影响供电。
⑵线路、断路器、母线故障和检修时，停运线路的回数和时间的长短，以及能否保证对重要用户的供电。
⑶变电所全部停电的可能性。
⑷满足对用户的供电可靠性指标的要求。
2、灵活性：
⑴调度要求。
可以灵活的投入和切除变压器、线路、调配电源和负荷，能够满足系统在事故运行方式下、检修方式以及特殊运行方式下的调度要求。
⑵检修要求。
可以方便的停运断路器、母线及其继电保护设备进行安全检修，且不影响对及户的供电。
⑶扩建要求。
应留有发展余地，便于扩建。
3、经济性：
⑴投资省；⑵占地面积小；⑶电能损失小。
三、拟定主接线方案
根据以上要求和本设计任务书要求，初步选择主接线如下：
原始资料：
变电所类型：
降压变电所
电压等级：
110/35/10KV
出线情况：
110KV出线两回，35KV出线8回（架空），10KV出线9回
负荷类别：
工农业生产及城乡生活用电
结合原始资料所提供的数据，权衡各种接线方式的优缺点，将各电压等级适用的主接线方式列出：
1、110KV只有两回出线，且作为降压变电所，110KV侧无交换潮流，两回线路都可向变电所供电，亦可一回向变电所供电，另一回作为备用电源。
所以，从可靠性和经济性来定，110KV部分适用的接线方式为双母接线和单母线分段两种。
2、35KV可有单母
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