高压三相感应电机缺相检测的一种新技术,高压三相感应电机缺相检测的一种新技术.doc

高压三相感应电机缺相检测的一种新技术,高压三相感应电机缺相检测的一种新技术 V o15N o3，Sep txxJ ou rn al of Mea sur emen tS cience an d Instru m en ta ti onS u m N o19A new m ea su rin g tech ni que in detect in g of h ig h vol ta g e th ree p has e i ndu cti on m otor for s i ngl e ph asi ng A li M E lR if a ie，H alaM Abd el M ageed(National Institute of Standards(NIS)，Giza12211136，Egypt)Ab stract Op enp h ase i n t hr ee p h ase in d ucti on m o tor s isa co m m on fa ul t t ha t ca n Ou r as a r esul t of a f use b lo w i n g o ra pr ot ectiv e de vice fai li n go n on e p h ase o f th e m o torT hi sp aper i n tro d ucesa ne wm e th od，w hich is b asedo n th etr an si en t measur em en tan dcan disti n gu ish th e fau lt o f on e p h ase co nn ectin ggr ou ndT h e m eth od h as been pr ov ed tobe in co rresp o nd ence w i th th e si mul ati on r esul tsb yM a tla ban dL ab V IE W inp rac ticeT h e meth od h as mer its o f si m p l icit y，a uracy a nd ease o f u seK ey w o rd shighvo ltag e i nd uc tio n m oto r；tr an sie n t p ro tecti on；sin gl e p h asi ng dete ctio n CL Dn umber TM346A rticleI D1674_8042 (xx)03000606D oc u m ent c od eA doi103969jissn16748042xx03002A t h reep h ase in d uc t ion m o to rop erat in gin ast eadyst at e wi ll co n t inue to op erat e w h ena d istu rban c et o th e system causes t he term inal v o lt ages tob eesi ng le ph asedT h is co n dit io nis ref erred t o as“si ng le p h asin ga n d w ill resu lt in an op eratin g c on d iti on t h atpr oduc esexc essh eatin th e m o to rSuc ha c on d itio n requ ires th at th e m ot or be p rov id ed w ith pr otec tio n that w ill disco n n ec t itf ro m th e system bef ore th e mo to r is p erm anently damage dSing le p h asin gint h ree ph ase in du c tio n m o to rsc an occu ras aresult of a fu se blo w in g or a pro t ec tiv e dev ic e fai lin go n on e p h aseo f t h e m ot orO th er possibilities inc lude feeder orstepdo wntran sf or merfuses bl ow in gE ven th oughth em oto rw illc on tin ue to op erate in th is con d itiont he m ot o rwillst illh eatup v er yqu ick lyT h eref ore。 i tis essential that th em oto rsh ould be rem oved f ro m serv ice by op eni ng am ot orc irc uit break ero rso meo th erty peso fp ro tectiv e d evic esW he n one p h aseo pe ns，t he cu rrent t o am ot or in t he t w o rem ain in g ph ases th eo ret ic ally increa ses to173(173)times the norm alcurrent draw of the m o to rT h e in c rease ca nbe asm uc h as2t im es(200)because pow er facto r chang esW here the m o to r has ahi gh in ertia load，t h e cu rren tc anappr oac h lo ck ed rot or v alues u n dersin gleph a sed con dit io nsT hree pro perly sized ti med elay，dua lelem en t fuses，andor three properly sizedoverload deviceswillsen sean drespo nd t o this overcu rren t”M ethod sf or p red ic tio n an d d etec tio n of m ot orf ault s are exten si velyd ocum ented in th e researc h lite ratu re；m an y o f t h esemetho ds use stato rcu rren t san dv o ltage sign als insom e f or m alo ngw it h sig n ature algo一*R eceived datexx一O316Corresponding authorA li M E1一R ifaie(alisystem11yahoo)rit hm s to d eter m in eor p red ictf au lt co nd it io ns in an in du c tio nm oto rW avelet sign al proc essin gan dF ourier ana lysis aret w otechn iques th at c an beused t o disc rim in ateth e sin gle p h asin g ca sef ro m oth erv olt age un bala nc e c ases Int hisp aper，anew f au lt de tec t ion too1t h at USeSt h e square v alu eo f th ei nst an taneo usv olt age sig na l an d its co mp lem ent top roduc ean un ity relation inn orm alco ndi tio nsis in tr oduc edT he sug gested COSsin t oo lisbein gap plied tod etec tth e c ase of sin gle phasing(open of one phase)in large induction m oto rsw h ere M at labsi muli nkis used tosi mul atea23k V，2250H P(1H P=0746k W)three phase in du c tio nm otorT he sim ulat ion resu lts sh o w ed t he c apa bility of t h e sugges tedt oo l tod etectt h e c ase of sin gle p h asin g，rel yin gont h em oto rS v ol tagesig nal du rin g sing le p hasingA p ractical ap p lic atio n of th e COSsin tool iS also sho w n usin g L ab V IEWw herethe sin gle p h asin gc ase isp ractic allysimu lated an dsuc c essf ullyde tect edC ossin alg orith m T h eCOSsi n alg orithmis givenas follo w st he v olt age sign al atanyin sta nt f or ag iven busba ris rep resen ted by V(t)=V?COS(wt O n th e ot h er ha nd，th e p lement couldbe obtainedas V0(t)where V0(t)=V?sin(wt+) (1)o ft his sig nalA liM E1一R ifaie，et a1A newmeasuring techniquein detecting of high voltage three phase induction motor7B ysq uarin g，a ddin ga nd no rm aliz in g t h eab ove twoequations，a discrimination signal Scs(t)can th en beintro du c edas5cS(t)Wm V(t)S cs(t)COS(Wt+)+sin。 (w t+)F ig1N orm al vol tag es ign ala nd its p lem en tdurin ga bnorm alco ndition T he value of Ss(t)iS unityas longas thereis noef f ect ive ch ang ein t h e v alu eo fV a ndno extrao rdin ar y co nd itio ntak in gplac eT his un it yrel ation is dist or ted assoo nas afau lt oc c ursT h e p eak v olta gev alu eis upd ated every(20ms forf=50H Z)，where fullsv nchronizationis done betw een the actualvoltage signal V(t)its plementV0(t)by acquiring the uti lizedo ne p letec y c leand valuesat thesame instantF ig1shows V(t)w ithsom e disturb an ces du eto afau lt at peak v olt age，w hile itsplement si gnalV0(t)appears todepe ndo nly onth eprefau lt peak vo ltageF ig2show s S cs(t)dur ingnorm al opera tion，where theunityrelat io niS kep t st eady2e Sampling time(ms)F i g2D iscri mina tionsign al d ur in gnorm alopera tionS im u lationstu dy for sin gle ph asin gin th ree p h ase ind ucti on m otors T h ec aseo fsin gle p hasin gin an in duct ionm ot oris sim ul ated usin gM at lab sim u lin kF ig3sho wst he simulink m odel fora thr eep hase w o un droto rin du ctio nmotorT hep aram eters o f th esimulat ed w oundmoto rare given inT able1Tb le3F ig3M atla bs imul inkmod el fo rs in gl eph as in gof a th ree ph asewoun drotor in ductio nmachin e T he caseof sin gl ep hasin gis simulated after15S o f th e moto rop eratio nF ig4sh ows th edevia tio n8J ournal of Measurement Scienceand Instrumentation V o15N o3，Septxxin t hen omin al op eratin gc ur rent va luesat th einstanto f faul tourrence，th e op en ed p hasehasa ze-ro c urren t，w h ile t he cu rren tso fot her p h ases inc reasedtoan exten to fd ouble t he normalopera tin gcurrentT able1P aram eters of simulated mo tor1000800600400200g0一2004006008001000娟堋。 V蟹0学14014515O155t(s)16O165170F ig4D evia tion of th ree ph a se curr ent sduri ng singl ephasi ng atp has eA F ig5sh owst hem easured v oltagesignalat t hein-stanto ffault o urrenc e，theop enedphase vo ltag edec reased slightly invalu ewh ileth eoth erphasesrem ain edunc han gedF ig5T hree pha sevol tages d ur ingsingl ep hasingat phaseA T hesugge sted COSsin t ech n iqu eis ap pl ieda ndthen Scs(t)is obtained following Eqs (1)to (3)T he simu latio nis do ne f or three d if f eren tload cases，no load，half load and full load whereScs(t)for allca sesare sh o wnin F ig60cg 00、t(s)(a)Scs(t)of theopened phase at no load t(s)(b)&s(f)of theopened phaseat half load t(s)(c)Scs(t)of theopened phaseatfullloadF ig6Si mul ation res ul ts und ernoloa d，halfloadandfu llloa dcon ditions It app earsc learlythat t heam ounto fm aximum andminimum dev iat ion f rom theu nity relat ion of(t)i ncreasesas theload increase sfrom zeroto maxi mum v alueT able2sh owsthedeviatio nin t he unityvalue of Scs(t)during single phasi ngof phaseA f oratim eof02SF romt hesh ownvalu es，it app earsclear lythatthenew COSsin t oo1c ansaf elydet ectthec aseofs ing leph asin g forhig hvo ltage，threephasein du ctio nmoto rsA liM E1一Rifaie，et a1A newmeasuring techniquein detectingof highvoltage threephase inductionmotor9Table2D eviation in Scs(t)at differentload values of faultedphas e3F aultde tection cr iterion forsinglephasingTo av o idthe e rro rst hat may o urintheunity re1atio nd uetoany var iation inthe peakvolt ageduringnorm aloperat ion，sinc ethemax imumpermissible variation inthepeak valu eo fthesi mulated works vo lta geis5a voltage d etec tionth resh old“e”ofaval ue0025(005)is used；H owever，will justact asa triggerthat initiates the operationof theCOSsin too lobtain erto startits missio nofdetecting faultpresenceT his isdonevia calcu lating the deviation“”in Scs(t)in oneplete cycle time starting fromthe instan tof faultou rrence，an dit isg iven as=I一骞s I， (4)wh ere nis the numb erofsamp leso fo ne p letec y c leof the syst emp ow erf requen cy，F ig7F lo w ch artofthepropo sedCOSs intoolforsin-gl ephas ing detec tionint hreephasei nd uctionm oto rs0nep letecycle timeis u sed toav oidwro ngt riggeringduetotr ansien tsF ig7sho wstheflowch artofthe pro posedtechn ique forsinglephasingfaultdetection，w herebot hthevoltage an d currentsig nalsareused todif ferentia tebet ween voltageunbalanceand si ng lephasing4S imulation T hesugges tedtoo1w asp ractic allysi mu lated to ch eck its applicabil ityforim plem entationinrealit yA llthen etwor kp onentsw ere modelled wherea400V powersou rce link edto anaut ot ransf orm erw asusedasasup ply，athreephase low vo lta ge inductionmotorthatis lo ad ed by agear box w as conn ectedto itan da setof bothsin glean dthreephasec ircuit breakers w ere co nnec ted in seriesan din sertedinbetw eenO ntie otherhan dthe pro posed techn iquewaspro gram med us ing the L abVI EW softw areD A Q via volta ge andcur renttransfor mersw hereth eyoc cup iedN o6a nalogu ein putsT ables3an d4off erthesDec ific atio ns ofthed ata acqu isitionc ardandtheparametersoftheused motor，respec tivelyan dall syst emsign alsweredeliv eredto theTab le3D ata acq uis itioncard DAQspeci ficationsSeries PC c onne ctionSam pling Analogue IP Analogue oP Digital IO C oun tert imerM US B125MSs32SE16D I448Ta ble4D ata of used moto rFrequency(H z)Capacity(kW)C os0IP Voltage(V)C urrent(A)R PM50400355230400ZxT143821440F ig8p resentstheconne ctionofthe labo rato ryequ ip mentwherethe motorphasi ng con ditioncanbe obt ain edbyusin gthesin glep hase circuit breakerF ig9rep resen tsthevo ltage oftheopened ph ase besid es its gen erated plem en ta rysignal whileF ig10r epresentstheco rrespondentcurr entsofthemotor duringsing lephasingourrence respective-lyT he discrim inationsignalob tained isil lust ratedinFig1110J ournalof Measurement Scienceand InstrumentationVo15No3，SeptxxFig8Labora torymo delconnec tion，、Jr1I。 iIflf Il；j jIIlIf Ij jj V1I1fIr VV0O020040O6O08O1O t(s)F ig9O penedphase voltageanditsgenera ted plementa ry、Ail燕rs一l，-,j F ig10M otor3phases curren ts|Fig11Scs(t)before and after single phasing Tab le5p rovides the deviatio nin thediscrimination signalScs(t)before andafter the singlephasingin cid entA)o口量一Av Tab le5D evia tion“”duringsinglephasingincid entat noload T he calcu latedvaluefortionexc eededthethresho ldvalue usedin simul ationowingtotheha rmonic cont entinthevolta gesigna1besidesthe err orsindetec ting thepeakvalueoftheorigin alvoltagesignal ever yonep letecycletimeT hat resultedinusin ga not herthresho ldvalueofE=006toavoid anywro ng operationT hepractic alsi mu latio nresu ltsacq uiredfromthe labo ratorymod ela lmo stco ncu rredw iththe Matlab sim ulin k simulation outes，they bothshow edthe capab ilitv oftheprop osedCOSsin toolincap turin gthecased uringnormalo peraofsinglephasi ngofamotor byusi ngthevoltagesig-nalonmachi ermj na】s5C onclu sion Thep aperint roducedanew tran sient based met ho dolo gyfor detect ingthecaseofsinglephasingin highvol tagethreephasein ductionmoto rsan dalso diff eren tia testhiscasef romsinglephasegro undfaul tsThesimulationresu ltsusingMatlabsimulinkshowedp letesuc cess ofdetectingthesing lephasin gcaseunder differentloadconditionsThelaborato ryresults showed fu llSUCCESS ofpractic ally appl ying thenew tran sient basedtoo1The result s alsosh ow ed itscap abilit yof detec tingthesinglephasing fault an d differen tiatingbetw eenvoltageun balan cecaseands inglephas ingo neTheresultsofthe twoimplem en ted simulations showeda large extentof plian cewith eachother andagreat Suc cessindetectingofphase losingThesuggested tool ischarac terizedby being simplefast，ac curat eand executa blewithind igital relaying schemesR eferen ces Ker stingW HC ausesandef fectsofunb al an cedvoltages servi nganind uctionmotorIE E E Transacti ons on In dustry Applications，xx，37 (1)165170O lakI C，el ik HC，Sef aI，et a1On1ineprotect ion syster ns fo rinductio nmoto rsE ner gyCon versionand M anagement，xx，46 (17)27732786B enbo uzidM，V iei raM，Theys CIn d uctionmotors faultde tectionandloc aliz ation usi