Thaum lub tshuab hluav taws xob ua haujlwm nyob rau hauv parallel nrog daim phiaj, lub zog rov qab relay saib cov kev taw qhia ntawm lub zog ntws. Yog hais tias lub hwj chim pib ntws los ntawm daim phiaj rov qab mus rau lub tshuab hluav taws xob, lub relay mus ncig ua si los tiv thaiv tus prime mover. Thaum lub relay mus ncig ua si tsis muaj laj thawj pom tseeb thaum lub sijhawm ua haujlwm ib txwm muaj, nws tsis yog cuam tshuam rau lub zog hluav taws xob xwb - nws kuj ua rau muaj kev tsis ntseeg txog tag nrho cov kev tiv thaiv Circuit Court. Raws li lub sijhawm ntev - lub sijhawm xa khoom ntawm cov khoom siv ntsuas hluav taws xob zoo, peb tau muab tso ua ke ib kauj ruam - los ntawm - cov lus qhia daws teeb meem raws li qhov ntsuas ntsuas ntsuas los pab koj ua haujlwm dhau ntawm qhov teeb meem no.
Thaum koj tau mus rau qhov chaw, tsis txhob maj hloov tej chaw. Pib los ntawm kev kuaj xyuas lub cev thiab kev xaim ntawm cov kab hluav taws xob thib ob. Xyuas kom tseeb tias lub npe phaj piv rau tam sim no transformer (CT) thiab lub peev xwm transformer (PT) phim qhov tau programmed rau hauv relay. Txheeb xyuas cov terminals uas raug, corrosion, lossis cov cim ntawm kev kub nyhiab, thiab nco ntsoov khaws cov hauv paus: tsis muaj qhib circuits hauv ob lub voj voog ntawm CTs lossis luv circuits hauv PTs. Cov kauj ruam tom ntej yog los sib piv cov duab kos kom paub qhov sib lawv liag ntawm peb theem voltages thiab theem tam sim no, vim hais tias ib qho rov qab fais fab relay yog rhiab heev rau polarity; txhua lub sij hawm lub hwj chim coj ntawm ib qho -theem CT yog thim rov qab, lub relay hnov qab lub hwj chim txawm hais tias lub hwj chim qhov twg los yog active zog. Hom kev ua yuam kev no ua rau muaj feem pua ntawm cov kev mus ncig uas tsis tsim nyog, thiab cov kev ua yuam kev no yooj yim los txheeb xyuas los ntawm kev nyeem nyob es tsis yog nyob ntawm kev rov ua dua.
Tom qab kuaj lub cev, rub tawm daim ntawv tiv thaiv. Qhov rov qab fais fab mus txawv tebchaws feem ntau yog teem caij nruab nrab ntawm 3% thiab 10% ntawm lub tshuab hluav taws xob ntsuas lub zog, nrog lub sijhawm ncua ntawm 1 mus rau 10 vib nas this. Yog tias qhov khoom nqa tau qis dhau lawm, txawm tias qhov kev thim rov qab luv luv tshwm sim los ntawm kev sib tw me me tuaj yeem ua rau muaj kev mus ncig. Yog tias qhov ncua sij hawm luv luv, lub kaw lus yuav tsis tuaj yeem caij los ntawm cov kev hloov pauv uas tshwm sim thaum lub phiaj xwm kaw. Ib txoj hauv kev los xyuas seb qhov no puas yog koj qhov teeb meem yog kom nce ib ntus nqa me ntsis thiab nce qhov qeeb me ntsis. Yog tias qhov teeb meem tsis txaus ntseeg nres, ces qhov yuav ua rau yog me me rov qab fais fab ntws los yog cuam tshuam. Nco ntsoov tias qhov no tsuas yog thawj kauj ruam xwb, koj tseem yuav tsum paub tias dab tsi ua rau muaj teeb meem.
Cov kauj ruam tseem ceeb tshaj plaws yog kev ntsuas nyob nrog peb -theem fais fab ntsuas ntsuas ntsuas. Clamp cov kev sojntsuam tam sim no nyob ib ncig ntawm CT thib ob circuits ntawm lub tshuab hluav taws xob tso zis lossis ntawm daim phiaj sib txuas sib txuas, thiab txuas cov hluav taws xob txuas mus rau PT thib ob terminals nyob rau theem raug. Lub ntsuas ntsuas yuav qhia qhov tseeb -lub sijhawm voltage- daim duab vector tam sim no thiab qhia cov cim ntawm lub zog nquag rau txhua theem, nrog rau tag nrho lub zog ua haujlwm. Thaum lub tshuab hluav taws xob xa tawm lub zog, lub zog siv tau txhais tau tias yog qhov zoo. Yog hais tias lub relay mus ncig ua si thaum tag nrho lub zog nyeem ntawv yog qhov zoo, koj tau txais qhov yuam kev. Daim duab vector yuav taw tes sai sai rau theem teeb meem. Raws li ib txwm muaj, lub kaum sab xis ntawm voltage thiab tam sim no yog me me. Yog tias tus vector tam sim no yuav luag 180℃tawm ntawm theem nrog qhov voltage{11}}yuav luag ncaj nraim{12}} theem ntawd lub CT polarity yog thim rov qab. Yog hais tias qhov voltage theem theem tsis ncaj ncees lawm -hais, theem B voltage tsaws rau theem C input- cov ces kaum theem yuav tsis zoo, tag nrho lub zog nyeem ntawv yuav bounce ntawm qhov zoo thiab qhov tsis zoo, thiab cov relay yuav zoo li sib tham lossis ua haujlwm tsis zoo. Cov kev sau cia muaj nuj nqi ntawm lub ntsuas ntsuas kuj tseem tuaj yeem ntes qhov loj thiab lub sijhawm ntawm lub sijhawm rov qab fais fab pulses, uas pab txiav txim seb qhov teeb meem puas yog qhov tseeb, luv luv - lub sijhawm rov qab fais fab.
Yog hais tias ntsuas lub hwj chim taw qhia zoo li qub tab sis lub relay tseem tripping, nws yog lub sij hawm los soj ntsuam lub hwj chim zoo. Qhov sib txawv zaus tsav, PV inverters, thiab rectifier loads txhaj tshuaj sib haum xeeb rau hauv lub cev, distorting qhov voltage thiab tam sim no waveforms. Qee qhov qub relays uas ua haujlwm ntawm xoom- hla kev tshawb pom lossis qhov nruab nrab- cov ntsiab lus muaj txiaj ntsig tuaj yeem tsis meej pem vim tias lub zog nquag cuam tshuam nrog kev sib haum xeeb tuaj yeem ntws mus rau qhov sib txawv ntawm lub zog zaus. Siv lub ntsuas ntsuas ntsuas tag nrho Harmonic Distortion thiab cov ntsiab lus sib haum xeeb ntawm tus kheej, tshwj xeeb tshaj yog 3rd, 5, thiab 7th harmonics. Yog tias koj pom lub zog tseem ceeb sib haum xeeb ntws rov qab mus rau lub tshuab hluav taws xob, xav txog kev txhim kho lub lim lossis hloov kho mus rau digital relay uas ua haujlwm nkaus xwb ntawm qhov tseem ceeb. Tsis tas li ntawd, nrhiav ib qho DC tivthaiv, uas tuaj yeem ua rau CT magnetic bias saturation thiab distort qhov ntsuas tam sim no.
Thaum koj tsis pom dab tsi tsis ncaj ncees lawm hauv cov kauj ruam saum toj no, ua tib zoo saib ntawm tus relay nws tus kheej thiab nws cov DC tswj fais fab mov. Ntsuas lub AC ripple ntawm cov khoom pabcuam; ntau ripple tuaj yeem scramble lub logic. Siv cov kev ntsuam xyuas relay teeb los xyuas qhov kev khiav hauj lwm lub zog thiab qhov siab tshaj plaws lub kaum ntse ntse, xyuas seb puas muaj kev cuam tshuam hauv cov yam ntxwv. Yog tias koj tsis muaj qhov ntsuas ntsuas tau yooj yim, koj tuaj yeem sib pauv cov relay nrog ib chav tsev zoo tib yam thaum lub zog hluav taws xob thiab sib piv kev ua haujlwm. Hauv av tswj cable thaiv kev ruaj ntseg ntawm ib qho kawg kom khaws ciaelectromagnetic cuam tshuam los ntawm cov cuab yeej nyob ze, uas ua haujlwm ntawm qhov sib txawv ntawm qhov sib txawv ntawm lub zog siab tawm ntawm qhov sib npaug. Yog tias koj ntsuas qhov hluav taws xob waveform ntawm lub relay input nrog lub oscilloscope portable, muaj peev xwm ua rau koj yuav pom tias siab - lub suab nrov nrov yog superimposed tshaj lub teeb liab. Feem ntau, xws li kev cuam tshuam tuaj yeem raug tshem tawm los ntawm kev txuas cov ferrite rings, refining hauv av, los yog luv luv cable ntev.
Txoj kev daws teeb meem ua haujlwm los ntawm sab nraud sab hauv. Qhov tseeb, thawj zaug txheeb xyuas cov xaim thiab polarity; tom qab ntawd, muab kev ntsuas ntawm lub zog kev taw qhia thiab qhov zoo; thiab, thaum kawg, tshuaj xyuas lub cuab yeej nws tus kheej. Los ntawm kev pom meej lub zog thiab theem ua ntu zus tso tawm rau ntawm lub tshuab ntsuas hluav taws xob zoo, lub zog plaub -quadrant fais fab ntsuas yuav pab txheeb xyuas cov kev taw qhia ntawm lub zog ntws yam tsis tas yuav hloov kho circuits. Yog tias koj ua raws li ntu no, koj tuaj yeem pom qhov laj thawj ntawm yuav luag txhua qhov rov qab fais fab relay tsis ua haujlwm hauv lub sijhawm luv tshaj plaws. Ntxiv mus, cov ntaub ntawv zoo ntawm cov kev ntsuam xyuas yuav tso cai rau koj los kho cov txheej txheem kev nyab xeeb zoo dua thiab hloov kho tsis tu ncua mus rau hauv txoj haujlwm tsis muaj zog.
