基于风险性的继电保护装置可靠性计算

28120091AdvancedTechnologyofElectricalEngineeringandEnergyVol.28,No.1Jan.2009:20080925:(07Jk080);(200625):(1969),,,,,王清亮,侯媛彬,付周兴,李忠(西安科技大学电气与控制工程学院,陕西西安710054):从风险性角度给出了一种评价工矿企业电网继电保护装置可靠性的指标,该指标综合考虑了保护装置的正确不动作事件失效事件的后果以及被保护设备故障率等因素;将保护装置的拒动失效事件分为不扩大拒动状态和扩大拒动状态,建立了保护动作的马尔可夫模型,运用状态空间法求解出保护装置的可靠性以失效事件造成的损失最小为目标,确立了可靠性与定期维护周期之间的关系算例分析结果表明,本文建立的完备概率模型及采用的可靠性计算指标为研究继电保护装置性能,提供了一种新的分析思路:继电保护;可靠性;失效事件;风险性;正确不动作;状态空间法:TM774:A:10033076(2009)010029051,,,,,,,,,,,,,,2,,[1],:=()!100%,=()!100%=1-[24],,:(1);[5],,,,,1Fig.1Diagramofpowerline1,QA∀,#10,9QA2,QA2;1,QA1,QA1,QA10,(2),[6],,,,,100,1,99%,,,,[79],[10],,,(3),,[1011],:,,,1,#,90%,∀,3,,,,,,F,R=1-F,(),njnw[0,t],finfout,fjfw,QjQw,QjQw[0,t],:Qj=njQj(1),[0,t]:Qw=nwQw(2),[0,t]:Q=(Qjfin+Qwfout)t(3):F=QQ=(Qj+Qw)Q(4):R=[1-F]!100%=(njQj+nwQw)Q(5),:nj=∃t0fjfindt,fjfin:nj=fjfint(6):nw=fwfoutt(7)(6)(7)(5):R=[1-F]!100%=(1-fj-fw)!100%(8),=(foutQw)(finQj),,,,,,,,QjQw,4,[5],,3028[1],,,22Fig.2Statespaceoflineprotectionaction:;;2,C,CL,M,BRB,U,ISO,OP,G,W,X1,2,3,45,,6,,,7,,,8mw,Rfg,c,Rc,b,mb,cmb,,x,Rxf,,:A=-a11w0ncmmbx0-a22Rfg00000Rxf0-a3300000Rfg00-a440000Rc000-a55m0000c00-a66b000c000-a770Rxf0nf00m0-a88A,a11=w+n+c+m+mb+x,a22=Rfg,a33=Rxf,a44=Rfg,a55=RC+m,a66=c+b,a77=b,a88=Rxf+nf+m8:P=[p1,p2,p3,p4,p5,p6,p7,p8],:P!A=0,8i=1pi=1(9)8,pw=p2,pj=p6+p7,pk=p4+p5,,,Qj1;,,,Qj2,Qj1Qj2:nj=(p6+p7)cnw=p2fg(10)(10)(5):R=[(1-p6)bQj1+(b-p7c)Qj2-p6cQj1]b(Qj1+Qj2)(11)5,1,[1012],Qj1=2,Qj2=60,Qw=20,b=04a-1,m=01a-1,c=05a-1,mb=02a-1,nf=0001a-1,n=02a-1,w=01a-1,fg=00002a-1,x=04a-1,Rc=025h-1,Rxf=07h-1QA180.3%,R=0311,:(11),3,,Q,3Fig.3Relationbetweenreliabilityandfailurerate,,,:minQ=Qj(T)+Qw(T),Tx,4,!,,,,,,,4Fig.4Relationbetweenreliabilityandroutineintervals6,,;,,,;,(References):[1],(JinXing,HongYanji).(Assessmentmethodsofsystemreliability)[M].:(Beijing:NationalDefenseIndustryPress),2005.[2],,,(WangGang,DingMaosheng,LiXiaohua,etal.).(Reliabilityanalysisofdigitalrelay)[J].(Proc.CSEE),2004,24(7):4752.[3],(LiYongli,LiZhizhong).(Studyofreliabilityandoptimalroutinetestintervalofprotectiverelays)[J].(Proc.CSEE),2001,21(6):6364.[4]KummJJ,WeberMS,SchweiterEO.Predictingtheoptimumroutinetestintervalforprotectiverelays[J].IEEETrans.onPowerDelivery,1995,10(2):659665.[5],(ZhangBaohui,YinXianggen).(Protectiverelayingofpowersystem)[M].:(Beijing:ChinaElec.PowerPress),2005.[6](LiWenyuan).(Riskassessmentofpowersystemsmodels,methodsandapplications)[M].:(Beijing:SciencePress),2006.[7]YuXingbin,SuiChanan.Powersystemreliabilityanalysisconsideringprotectionfailures[A].Proc.IEEEPowerEngineeringSocietySummerMeeting[C].Chicago,USA,2002.963968.[8],(SunFushou,WangXionghai).(Applicationofanenhancedparticleoptimizationalgorithmforprotectionrelaysettingcoordination)[J].(AutomationofElec.PowerSystem),2006,30(16):3235.[9],,,(XiongXiaofu,OuyangQianfang,ZhouJiaqi,etal.).(Probabilitymodelfortherelayprotectionsystem%scorrectfailureremoval)[J].(AutomationofElec.PowerSystem),2007,31(7):1214.[10],,,(ZhouYulan,ZhanRongrong,ShuYehuai,etal.).2003(Statisticandanalysisofprotectionrelayingandautomationdevicesofpowersysteminchina,2003)[J].(PowerSystemTech.),2004,28(20):4853.[11]RoyBillinton,FotuhiFiruzabadM,SidhuTS.Determinationoftheoptimumroutinetestandselfcheckingintervalsinprotectiverelayingusingareliabilitymodel[J].IEEETrans.3228onPowerDelivery,2002,17(3):663669.[12],(ZhuYongqiang,YinZhongdong).(Newevaluationsystemforenergysavingsbasedonefficiencyandlossratio)[J].(Adv.Tech.ofElec.Eng.&Energy),2007,26(3):3336.ReliabilityassessmentofprotectiverelayingbasedonoperationrisktheoryWANGQingliang,HOUYuanbin,FUZhouxing,LIZhong(Xi%anUniversityofScienceandTechnology,Xi%an710054,China)Abstract:Basedontherisktheory,anewreliabilityindexisproposedconsideringcorrectinaction,failureeventsandthefailureprobabilityofprotectedequipmentinprotectiverelays.Theeconomicallossesresultedfromfailureeventsaretakenintoconsiderationinthemethod.Ageneral8stateMarkovprobabilitymodeloflineprotectionissetupinwhichresistoperationfailuresaredividedintoextendedstateandnoextendedstate.Usingthestatespacemethod,thereliabilityindiceshavebeencalculated.Studieshavebeenconductedtoascertaintherelationbetweentheprotectionreliabilityandfailureprobabilityofequipmentinvolvingtheeconomicallossofincorrectoperation.Then,theoptimalmaintenanceintervalisderivedbytakingtheminimumofriskassessmentsastargetfunctionforprotectiverelays.Theobtainedintervalissignificanttopredicttheprotectionmaintenance.Thegeneralanddetailedreliabilitymodelwithitsalgorithmwasvalidatedwiththeprotectiverelaystest.Itprovesanewideaandmethodtoimproveprotectionsystemandtheycanenhancethesecurityofdistributionpowersupply.Keywords:protectiverelay;reliability;failureevent;riskassessment;correctinaction;statespacemethod(28,cont.fromp.28)ResearchonhighvoltagetestequipmentbasedoneffectofspaceelectricfieldTANGNingping1,ROUShaoyu2,LIAOFuwang2(1.FuzhouUniversity,Fuzhou350108,China;2.FujianElectricPowerTest&ResearchInstitute,Fuzhou350007,China)Abstract:Onthebasisofthecalculationandanalysisofelectricfieldofanewtypeofcapacitivedividerbasedontheeffectofspaceelectr