Tam sim no Transformer (CT) yog cov khoom siv hluav taws xob rau kev tiv thaiv kev tiv thaiv thiab kev ua txhaum hauv lub zog hluav taws xob. Nws lub luag haujlwm tseem ceeb yog los hloov cov tam sim no loj ntawm lub hauv paus system rau hauv cov qauv me me tam sim no ntawm cov txheej txheem thib ob -raws li qhov kev hloov pauv tshwj xeeb- thiab xa cov teeb liab tam sim no mus rau cov khoom siv relay, ntsuas lossis tswj cov tshuab. Kev tiv thaiv CT muab lub teeb liab ua txhaum tam sim no rau kev tiv thaiv cov cuab yeej thiab lub hauv paus tseem ceeb rau kev ua haujlwm ceev ntawm cov hluav taws xob hluav taws xob thaum muaj xwm txheej txawv xws li luv luv Circuit Court thiab overflow tshwm sim.
Kev tiv thaiv CTs yog ib qho tseem ceeb ntawm kev tiv thaiv relay hauv cov chaw nres tsheb, cov kab sib txuas thiab xa tawm, cov chaw tsim hluav taws xob thiab cov khoom siv hluav taws xob. Ntxiv rau qhov tsuas yog hloov pauv tam sim no xwb, lawv yuav tsum tswj xyuas cov teeb liab tso tawm kom ntseeg tau raws li qhov ua txhaum cai tam sim no kom ntseeg tau tias kev ua kom tsis muaj hnub nyoog ntxov tsis cuam tshuam qhov tseeb ntawm kev txiav txim siab tiv thaiv.
Dab tsi yog qhov kev tiv thaiv tam sim no transformer?
Protective Current Transformer (PCT), feem ntau hu ua Protective CT, yog ib hom PCT tshwj xeeb uas tsim los rau kev tiv thaiv relay.
Nws yog ntsia tau rau hauv lub ntsiab high voltage los yog high tam sim no Circuit Court, thiab nws lub ntsiab winding yog txuas nrog lub Circuit Court nyob rau hauv series thiab tiv thaiv. Raws li qhov tam sim no ntws los ntawm lub hauv paus winding, cov tub ntxhais hlau ua ib qho sib nqus flux, uas ua rau muaj qhov sib npaug tam sim no rau thawj qhov tam sim no hauv qhov thib ob winding.
Xav txog, piv txwv li, ib qho CT nrog qhov ntsuas kev hloov pauv ntawm 600 / 5A: thaum ib qho tam sim no nce mus txog qhov ntsuas 600A, cov txiaj ntsig thib ob yog li 5A. Los ntawm kev saib xyuas qhov thib ob tam sim no, cov khoom siv tiv thaiv relay tuaj yeem txiav txim siab txog kev ua haujlwm ntawm thawj qhov system.
Lub luag haujlwm ntawm kev tiv thaiv CT tsis yog tsuas yog "txhaum" cov dej ntws loj, tab sis ib qho ntawm nws cov yam ntxwv tseem ceeb yog nws lub luag haujlwm hauv kev tshawb nrhiav qhov txhaum. Thawj qhov tam sim no tuaj yeem tshwm sim sai sai thaum lub sijhawm luv luv - cov xwm txheej hauv Circuit Court, yog li kev tiv thaiv CTs yog tsim los daws cov teeb meem txhaum cai tam sim no thiab cuam tshuam cov xwm txheej ib ntus.
Lub hauv paus ntsiab lus ua haujlwm ntawm kev tiv thaiv tam sim no transformer yog dab tsi?
Lub hauv paus kev ua haujlwm ntawm kev tiv thaiv CT yog zoo ib yam li cov qauv tam sim no transformers, uas siv electromagnetic induction los hloov thawj tam sim no mus rau theem nrab tam sim no.
Thawj winding txuas nrog lub ntsuas hluav taws xob, thaum lub thib ob winding txuas nrog cov khoom siv tiv thaiv relay. Thaum qhov hloov pauv tam sim no ib zaug, cov hlau nplaum sib nqus hauv cov tub ntxhais hlau hloov pauv ib yam, ua rau tam sim no tsim nyob rau hauv qhov thib ob winding. Cov khoom siv tiv thaiv relay tsis tas yuav muaj kev sib cuag ncaj qha nrog high-voltage, siab- cov thawj circuits tam sim no; Hloov chaw, lawv tau txais cov cim tam sim no theem nrab proportional rau thawj tam sim no los ntawm kev tiv thaiv tam sim no transformers.
Txoj kev no siv ob lub hom phiaj tseem ceeb:
Ua ntej, nws txo cov qib tam sim no los ntawm cov khoom siv tiv thaiv relay, tso cai rau cov khoom siv los siv cov txheej txheem thib ob tam sim no nkag.
Qhov thib ob, lub high voltage thawj qhov kev tiv thaiv thiab cov cuab yeej tiv thaiv theem nrab yog cais cov hluav taws xob, uas txhim kho kev nyab xeeb ntawm tag nrho cov kev tiv thaiv.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov kev ua tau zoo ntawm CT tiv thaiv tsis yog nyob ntawm nws qhov kev hloov pauv, tab sis kuj tseem nyob ntawm nws qhov tseeb qhov ntsuas, ntsuas qhov ntsuas, cov tub ntxhais thiab cov cwj pwm saturation nyob rau hauv qhov teeb meem tam sim no.
Dab tsi yog lub luag haujlwm tseem ceeb ntawm kev tiv thaiv tam sim no transformers?
1. Cov teeb liab tam sim no rau kev tiv thaiv relay
Qhov no yog lub luag haujlwm tseem ceeb ntawm kev tiv thaiv tam sim no transformer.
Cov khoom siv tiv thaiv relay yuav tsum kuaj xyuas cov kev hloov pauv hauv Circuit Court tam sim no los txiav txim seb puas muaj qhov luv luv lossis overcurrent tej yam kev mob. Kev tiv thaiv CT hloov pauv qhov tam sim no ntawm lub hauv paus system mus rau theem nrab cov teeb liab tam sim no, uas tau xa mus rau cov khoom siv tiv thaiv relay.
Thaum qhov ntsuas tam sim no nce mus txog qhov kev tiv thaiv tus nqi, qhov kev tiv thaiv relay tuaj yeem xa tawm cov lus txib tripping raws li preset logic.
Yog li ntawd, lub teeb liab zoo muab los ntawm relay CT ncaj qha cuam tshuam rau kev txiav txim siab - ua kev tiv thaiv relay.
2. Kev kuaj xyuas luv luv - Circuit Court thiab overcurrent faults
Thaum lub voj voog luv luv tshwm sim hauv lub zog hluav taws xob, qhov txhaum tam sim no feem ntau yog siab dua li qhov tam sim no.
Kev tiv thaiv tam sim no transformers xa cov kev hloov tam sim no mus rau cov cuab yeej tiv thaiv, tso cai rau lub kaw lus kom pom qhov tsis txaus ntseeg.
Hauv ntau txoj kev tiv thaiv, kev tiv thaiv CTs tuaj yeem siv ua ke nrog kev tiv thaiv kev tiv thaiv overcurrent, ncua sijhawm (ceev- ua) kev tiv thaiv thiab kev tiv thaiv sib txawv. Raws li cov qauv ntawm lub zog hluav taws xob, cov cuab yeej tiv thaiv thiab kev tiv thaiv relay tau xaiv, qhov kev teeb tsa tshwj xeeb tau txiav txim siab.
3. Koom tes nrog cov hluav taws xob hluav taws xob los pab daws teeb meem
Kev tiv thaiv CT feem ntau tsis cuam tshuam ncaj qha rau qhov txhaum tam sim no, tab sis yog lub luag haujlwm muab qhov teeb meem tam sim no.
Thaum cov khoom siv tiv thaiv relay txiav txim siab qhov txhaum hauv kab raws li CT teeb liab, nws xa ib qho kev txiav txim dhia mus rau lub Circuit Court breaker, uas tom qab ntawd cais qhov txhaum ntawm ib feem.
Yog li ntawd, cov luag haujlwm no tuaj yeem sau tau raws li hauv qab no:
Kev tiv thaiv CT yog lub luag haujlwm rau "nrhiav tam sim no," relay tiv thaiv ntaus ntawv yog lub luag haujlwm rau "kev txiav txim siab-", thiab Circuit Court breaker yog lub luag haujlwm rau "kev cuam tshuam tsis ua haujlwm."
Ua ke, peb lub ntsiab lus no yog qhov tseem ceeb ntawm cov saw hlau tiv thaiv hauv lub zog hluav taws xob. Hluav taws xob rho tawm thiab teeb liab hloov dua siab tshiab
Lub ntsiab system feem ntau ua haujlwm nyob rau hauv high voltage thiab high tam sim no ib puag ncig, lub ntsiab lus relay tiv thaiv cov khoom siv feem ntau tsis ncaj qha mus rau lub ntsiab Circuit Court.
Kev tiv thaiv tam sim no Transducers (CTs) siv electromagnetic induction los hloov cov thawj tam sim no rau hauv cov teeb liab tsim nyog rau cov khoom siv tiv thaiv theem nrab, thaum muab hluav taws xob cais tawm ntawm theem pib thiab theem nrab.
Qhov no yog qhov tseem ceeb rau kev txhim kho kev nyab xeeb ntawm cov cuab yeej tiv thaiv thiab kev ntseeg tau ntawm qhov system.
Dab tsi yog qhov txawv ntawm kev tiv thaiv-chav kawm CTs thiab ntsuas CTS?
Txawm hais tias ob hom CT siv electromagnetic induction rau kev hloov pauv tam sim no, lawv tau tsim los rau ntau lub hom phiaj.
Kev ntsuas -chav kawm CTs feem ntau yog siv hauv ammeter, lub zog ntsuas hluav taws xob thiab lwm yam ntsuas ntsuas, tsom rau kev ntsuas qhov tseeb hauv kev ua haujlwm tam sim no.
Kev tiv thaiv-chav kawm CTs feem ntau ua haujlwm pabcuam kev tiv thaiv relay, yog li nws yuav tsum tau ua tib zoo saib xyuas kev ua haujlwm ntawm qhov tsis raug tam sim no. Thaum luv luv -circuiting, ib qho tam sim no tuaj yeem ua tau ob peb zaug lossis ntau dua li qhov ua haujlwm tam sim no, yog li thaum xaiv CTs rau kev tiv thaiv, kev ua haujlwm tsis zoo uas ua tau raws li kev tiv thaiv cov cai yuav tsum raug xaiv.
Nyob rau hauv luv luv, metering CTs prioritizes "kev ntsuas raug thaum lub sij hawm ib txwm ua hauj lwm" thaum kev tiv thaiv CTs prioritizes "ntseeg tiv thaiv teeb liab nyob rau hauv qhov kev tshwm sim ntawm tsis ua hauj lwm."
Thaum xaiv CT, qhov tsim nyog tsis tuaj yeem txiav txim siab ntawm kev hloov pauv; yam xws li kev ntsuas qhov tseeb, kev thauj khoom (load), kev tiv thaiv kev tiv thaiv thiab kev ua txhaum ntawm lub cev yuav tsum raug coj mus rau hauv tus account.
Dab tsi yuav tsum tau txiav txim siab thaum xaiv cov txheej txheem CT?
Kev xaiv yuav tsum yog raws li qhov tseeb tsis muaj zog ntawm lub zog.
Ua ntej, ntsuas cov thawj thiab thib ob tam sim no -feem ntau hu ua CT transformation ratio. Qhov kev sib piv no yuav tsum ua raws li kev ua haujlwm ib txwm muaj tam sim no ntawm kev tiv thaiv kab thiab kev tiv thaiv tshwj xeeb.
Qhov thib ob, xav txog qhov precision qeb. Cov qib raug yuav tsum raug xaiv raws li cov qauv siv tau thiab cov txheej txheem tiv thaiv relay tshwj xeeb; daim ntawv thov kev tiv thaiv sib txawv yuav xav tau ntau qhov tseeb.
Tsis tas li ntawd, cov kev ntsuas xws li ntsuas qhov ntsuas, ntsuas zaus, ntsuas qhov ntsuas hluav taws xob, luv -lub sij hawm cua sov ntws, dynamic ruaj khov tam sim no thiab txoj kev teeb tsa yuav tsum raug coj mus rau hauv tus account.
Nws yog ib qho tseem ceeb rau kev tiv thaiv tus yam ntxwv saturation ntawm CT nyob rau hauv siab txhaum tam sim no nyob rau hauv ib tug system nrog nruj tiv thaiv kev ua tau zoo yuav tsum tau.
Dab tsi yuav tsum muaj kev tiv thaiv -chav kawm CTs them nyiaj rau lub sijhawm teeb tsa thiab siv? Ua ntej txhim kho Cov Kev Tiv Thaiv Tam Sim No Transformer (CT), xyuas kom meej tias qhov ntsuas ntsuas ntawm cov khoom ua tau raws li qhov yuav tsum tau ua ntawm lub system tiag tiag thiab xyuas qhov tseeb ntawm qhov kev sib txuas ntawm thawj thiab thib ob.
Thib ob, Kev saib xyuas tshwj xeeb yuav tsum tau them rau kev ruaj ntseg. Thaum lub sijhawm ua haujlwm ib txwm muaj, lub voj voog thib ob ntawm lub tshuab hloov tam sim no tsis tuaj yeem nyob hauv lub xeev qhib. Yog hais tias tam sim no ntws los ntawm thawj sab thaum lub thib ob Circuit Court qhib, ib tug txaus ntshai high voltage tej zaum yuav raug generated nyob rau hauv lub thib ob sab, ua rau muaj kev hem thawj rau rwb thaiv tsev ncaj ncees thiab tus kheej kev nyab xeeb.
Tsis tas li ntawd, kev xaim, hauv av thiab lub davhlau ya nyob twg txuas ntawm CT auxiliary circuit yuav tsum ua raws li cov qauv tsim. Tom qab installation, polarity, transformation ratio, rwb thaiv tsev thiab theem nrab Circuit Court nws tus kheej yuav tsum tau soj ntsuam.
Ntev -Lub sijhawm tiv thaiv CTs yuav tsum tau kuaj xyuas tsis tu ncua nrog rau lub sijhawm saib xyuas ntawm lub zog hluav taws xob.
Xaus:
Kev tiv thaiv tam sim no transformer yog lub hauv paus tseem ceeb hauv kev tiv thaiv kev tiv thaiv hluav taws xob. Nws lub luag haujlwm tseem ceeb yog hloov pauv qhov loj tam sim no ntawm lub hauv paus tseem ceeb rau hauv cov teeb liab tam sim no haum rau cov khoom siv tiv thaiv relay, yog li muab cov ntaub ntawv hauv paus rau kev kuaj pom kev txhaum, kev tiv thaiv relay logic thiab Circuit Court breaker tripping.
Hauv kev siv tswv yim, kev xaiv ntawm kev tiv thaiv CT yuav tsum muaj kev ntsuam xyuas zoo ntawm qhov kev hloov pauv tam sim no; Kev ntsuas qhov tseeb, ntsuas load, txhaum tam sim no, tus yam ntxwv saturation, qib rwb thaiv tsev thiab kev teeb tsa yuav tsum raug coj mus rau hauv tus account.
Rau substations, kis tau tus mob thiab tis kab, lub zog tsim hluav taws xob systems thiab industrial tis khoom, xaiv ib tug tiv thaiv CT uas phim cov txheej txheem tiv thaiv pab kom ntseeg tau tias relay tiv thaiv system tau ruaj khov thiab txhim khu kev qha tam sim no cov cim.
