Tam sim no transformers yog indispensable core instruments nyob rau hauv lub metering, tiv thaiv, thiab saib xyuas ntawm lub hwj chim systems. Txawm hais tias nyob rau hauv lub Hoobkas faib chav, substations, lossis lub tsev faib khoom, lawv tuaj yeem pom yuav luag txhua qhov kev ntsuas tam sim no. Nyob sab hauv ib leeg-theem tam sim no transformers, raws li hom siv dav tshaj plaws, ua lub luag haujlwm tseem ceeb hauv kev hloov cov dej ntws loj hauv siab - cov kab hluav taws xob mus rau qhov me me tam sim no tsim nyog rau kev nyab xeeb siv los ntawm cov twj paj nruag thiab cov relays. Kab lus no yuav qhia txog lub ntsiab lus, qauv, thiab txoj hauv kev ua haujlwm ntawm sab hauv ib leeg -theem tam sim no transformers, pab cov kws tshaj lij hluav taws xob thiab cov neeg pib tsim kev nkag siab meej.
I. Tam sim no Transformer yog dab tsi?
Tam sim no transformer (CT) yog ib qho kev ntsuas tshwj xeeb thiab hloov khoom siv. Nws lub luag haujlwm tseem ceeb yog kom hloov pauv cov dej loj hauv lub zog rau hauv cov qauv me me. Feem ntau, nws hloov pauv qhov tseem ceeb tam sim no rau hauv tus qauv 5A lossis 1A cov khoom tso tawm nyob rau sab thib ob, ua kom muaj kev nyab xeeb ntawm cov khoom siv thib ob xws li cov cuab yeej ntsuas hluav taws xob, ammeters, wattmeters, thiab cov khoom siv tiv thaiv relay.
Vim li cas qhov kev hloov dua siab tshiab no tsim nyog? Muaj ob qho laj thawj: Ua ntej, cov kab tam sim no hauv cov tshuab hluav taws xob feem ntau ncav cuag ntau pua lossis ntau txhiab tus amperes, ua rau kev sib txuas ncaj qha rau cov twj paj nruag zoo tib yam ua tsis tau. Thib ob, siab - cov kab hluav taws xob tsis tuaj yeem txuas ncaj qha rau cov ntsuas ntsuas; txwv tsis pub, cov neeg ua haujlwm yuav ntsib kev pheej hmoo ntawm hluav taws xob poob siab. Tam sim no transformers tau txais hluav taws xob rho tawm los ntawm lub hauv paus ntsiab lus ntawm electromagnetic induction, ob qho tib si proportionally txo qhov tam sim no thiab tag nrho cais qhov siab -voltage sab los ntawm qis-voltage theem nrab Circuit Court, fundamentally kom muaj kev ruaj ntseg ntawm kev ntsuas cov neeg ua hauj lwm thiab cov khoom.
II. "Indoor Single-Phase" yog dab tsi?
Sab Hauv Tsev: Qhov no yog hais txog tus qauv transformer tshwj xeeb tsim rau kev teeb tsa hauv tsev. Nws cov txheej txheem rwb thaiv tsev, qib tiv thaiv qhov thaiv, thiab kev nkag mus deb yog tsim los rau cov xwm txheej sab hauv tsev thiab tsis haum rau kev siv ncaj qha rau hauv ntub dej, qias neeg, lossis los nag -tawm sab nraum zoov.
Tib -Phase: Qhov no txhais tau hais tias txhua lub transformer ntsuas qhov tam sim no ntawm tsuas yog ib theem kab, nrog rau ib chav nyob configured rau ib theem. Hauv peb -theem system, yog tias peb yuav tsum tau ntsuas tam sim no, ob lossis peb zaug ib zaug -theem transformers feem ntau xav tau (nyob ntawm txoj kev xaim). Piv rau peb -theem integrated tam sim no transformers, ib leeg-theem tam sim no transformers yog me me thiab hloov tau yooj yim dua nyob rau hauv installation, yooj yim rau lawv tso rau hauv ntau yam tis txee, switchgear, thiab metering thawv.
III. Cov Txheej Txheem Txheej Txheem ntawm Sab Hauv Tsev Ib Leeg -Theem Tam Sim No Transformers
Sab hauv ib leeg-theem tam sim no transformers feem ntau yog cov hauv qab no los ntawm sab nraud hauv:
1. Core
Cov tub ntxhais yog cov hlau nplaum hluav taws xob ntawm lub tshuab hluav taws xob, feem ntau yog ua los ntawm cov khoom sib nqus siab -permeability silicon steel los xij, tsim lub voj kaw sib nqus flux. Cov khoom siv thiab ntoo khaub lig-sectional cheeb tsam ntawm cov tub ntxhais ncaj qha cuam tshuam rau cov chav kawm raug thiab qhov ua yuam kev ntawm lub transformer. Metering transformers xav tau cov tub ntxhais permeability siab thiab qis hysteresis poob; kev tiv thaiv kev hloov pauv tseem ceeb yog qhov tseem ceeb ntawm cov tub ntxhais lub peev xwm los tiv thaiv ntxov ntxov saturation nyob rau hauv siab - tam sim no faults.
2. Primary Winding (Primary Coil)
Cov thawj winding muaj ob peb lem, feem ntau tsuas yog ib mus rau ob peb lem, tej zaum ncaj qha tsim los ntawm ib tug busbar los yog tooj liab pas nrig hla lub hauv paus. Cov thawj winding yog txuas nrog nyob rau hauv series mus rau ntsuas fais fab kab, thiab cov thawj loj tam sim no ntws los ntawm no winding los tsim ib tug magnetic teb.
3. Secondary Winding (Secondary Coil) Qhov thib ob winding muaj ntau lem thiab raug mob nyob ib ncig ntawm cov tub ntxhais hlau. Nws ua tiav electromagnetic coupling nrog thawj winding los ntawm cov tub ntxhais hlau lub magnetic teb, inducing ib tug thib ob tam sim no. Ob lub terminals ntawm qhov thib ob winding feem ntau yog cim S1 thiab S2 (los yog K1 thiab K2) rau cov cuab yeej sab nraud thiab kev sib txuas.
4. Insulator Lub insulator qhwv ib ncig ntawm cov tub ntxhais hlau thiab winding, tag nrho cais qhov siab -voltage thawj Circuit Court los ntawm qis-voltage Secondary circuit. Cov txheej txheem rwb thaiv tsev rau sab hauv tsev tam sim no muaj xws li epoxy resin casting (monolithic casting, zoo rwb thaiv tsev, compact qauv) thiab insulating ntawv wrapping nrog cov kua roj vanish (cov txheej txheem ib txwm ua, haum rau loj - khoom muaj peev xwm).
5. Housing thiab Mounting Bracket Lub vaj tse feem ntau yog monolithic epoxy resin casting lossis hlau vaj tse. Txoj kev txhim kho muaj xws li los ntawm - phab ntsa, ncej, thiab bushing hom, nrog cov ntawv sib txawv xaiv nyob ntawm qhov chaw teeb tsa thiab cov qauv hauv Circuit Court.
IV. Txoj Cai Ua Haujlwm ntawm Sab Hauv Tsev Ib Leeg-Theem Tam Sim No Transformers
Lub hauv paus ntsiab lus ua haujlwm ntawm sab hauv ib leeg -theem tam sim no transformers yog raws li Faraday txoj cai ntawm electromagnetic induction. Nws cov ntsiab lus yog tib yam li cov transformer, tab sis cov kev khiav hauj lwm muaj qhov sib txawv. Cov txheej txheem ua haujlwm yooj yim yog raws li hauv qab no:
Thaum cov thawj tam sim no I₁ ntws los ntawm thawj winding (N₁ tig) nyob rau hauv Circuit Court nyob rau hauv kev sim, raws li Ampere txoj cai, tam sim no generates ib tug alternating sib nqus flux Φ nyob rau hauv lub hlau core. Qhov kev sib nqus sib nqus sib nqus no dhau los ntawm kev sib tw thib ob nrog N₂ lem, thiab raws li Faraday txoj cai ntawm electromagnetic induction, lub zog hluav taws xob theem nrab yog induced nyob rau hauv lub thib ob winding, yog li tsim ib tug thib ob tam sim no I₂ nyob rau hauv lub thib ob Circuit Court txuas nrog rau lub load (strument internal resistance).
Qhov sib txawv tseem ceeb ntawm lub tshuab hloov tam sim no thiab lub tshuab hloov pauv yog: Lub tshuab hloov hluav taws xob ua haujlwm nyob ze - tsis muaj - loaded lossis loaded tej yam kev mob, thiab qhov nruab nrab voltage nws txawv nrog load; thaum lub transformer tam sim no ua haujlwm ib txwm nrog nws cov theem nrab nyob rau hauv ib qho ze ntawm - luv - Circuit Court (nrog rau qhov ntsuas qhov nruab nrab tsawg), thiab cov tam sim no theem nrab muaj qhov sib npaug sib npaug nrog cov thawj tam sim no, ywj siab ntawm qhov loj me. Vim hais tias ntawm no tus yam ntxwv, lub thib ob sab ntawm ib tug tam sim no transformer yuav tsum tsis txhob ua hauj lwm nrog ib tug qhib Circuit Court. Thaum qhib-circuited, cov hlau nplaum sib nqus los ntawm cov tub ntxhais yuav nce siab vim qhov poob ntawm demagnetizing ampere- tig rau sab thib ob, ua rau cov tub ntxhais tshaj - saturation thiab inducing ib tug txaus ntshai heev voltage (mus txog ob peb kilovolts) nyob rau theem nrab, hnyav hem cov cuab yeej thiab cov neeg ua hauj lwm kev nyab xeeb.
V. Main Technical Parameters of Indoor Single-Phase Current Transformers
Tom qab nkag siab txog lub hauv paus ntsiab lus ntawm kev ua haujlwm, nws tseem yuav tsum tau paub txog cov ntsiab lus hauv qab no:
Rated tam sim no ratio (transformation ratio): xws li 100/5, 200/5, 400/5, thiab lwm yam, sawv cev rau qhov piv ntawm cov rated tam sim no nyob rau hauv thawj sab mus rau lub rated tam sim no nyob rau hauv lub thib ob sab, yog lub ntsiab parameter rau xaiv.
Cov chav kawm raug (qib qhov tseeb): Feem ntau pom yog 0.1, 0.2, 0.5 (rau kev ntsuas) thiab 5P, 10P (rau kev tiv thaiv). Tus lej tsawg dua, qhov tseeb dua. Cov qib sib txawv yuav tsum raug xaiv rau cov ntawv thov sib txawv.
Rated Secondary Load (VA): Qhov no yog hais txog lub zog pom tseeb sib haum rau qhov siab tshaj plaws tso cai impedance txuas nrog rau sab thib ob ntawm qhov tam sim no transformer. Feem ntau qhov tseem ceeb yog 5VA, 10VA, 15VA, 30VA, thiab lwm yam. Tag nrho cov impedance ntawm cov cuab yeej txuas yuav tsum tsis pub tshaj qhov nqi; txwv tsis pub, qhov yuam kev yuav nce.
Rated rwb thaiv tsev Voltage (Um): Qhov no qhia tias cov rwb thaiv tsev tiv thaiv hluav taws xob hauv chav kawm ntawm thawj sab ntawm lub tshuab hluav taws xob tam sim no rau hauv av thiab rau sab thib ob, xws li 0.72kV, 3.6kV, 7.2kV, thiab lwm yam.
VI. Daim ntawv thov tseem ceeb
Cov xwm txheej sab hauv tsev ib leeg-theem tam sim no transformers tau dav siv hauv cov ntawv thov hauv qab no: ntsuas thiab tiv thaiv circuits hauv lub Hoobkas hluav taws xob faib hluav taws xob; tam sim no nrhiav tau nyob rau hauv 10kV switchgear thiab tsawg-voltage faib txee; tam sim no
sampling nyob rau hauv substation relay tiv thaiv cov cuab yeej; lub zog ntsuas lub thawv hauv tsev faib khoom; thiab tam sim no saib xyuas circuits hauv industrial automation systems.
FAQ
Q1: Vim li cas thiaj tsis tuaj yeem qhib qhov thib ob ntawm lub tshuab hloov tam sim no -circuited?
A: Thaum ob sab yog qhib -circuited, lub magnetic flux nyob rau hauv lub hlau core poob lub demagnetizing nyhuv ntawm lub thib ob tam sim no, ua rau ib tug ntse nce nyob rau hauv sib nqus flux. Qhov no induces ib tug high voltage ntawm ob peb txhiab volts nyob rau hauv lub thib ob sab, uas yuav yooj yim ua rau lub rwb thaiv tsev tawg ntawm tam sim no transformer thiab hluav taws xob shocks. Sab ob sab yuav tsum luv luv -circuited ua ntej disassembling lub ntsuas.
Q2: Nws puas muaj kev nyab xeeb dua los xaiv qhov hloov pauv loj dua rau qhov tam sim no transformer?
A: Tsis tas li. Ib qho kev hloov pauv loj heev yuav ua rau muaj qhov tsis txaus nyob rau theem nrab tam sim no nyob rau hauv ib txwm ua haujlwm, nce kev ntsuas qhov yuam kev thiab tsis raug ntsuas ntsuas. Ib qho kev hloov pauv tsim nyog yuav tsum raug xaiv raws li qhov tseeb qhov siab tshaj plaws tam sim no; Feem ntau, ib txwm ua haujlwm tam sim no ntawm 60% mus rau 80% ntawm qhov ntsuas thawj tam sim no yog qhov zoo dua.
Q3: Lub tshuab hluav taws xob hauv tsev puas tuaj yeem nruab sab nraum zoov?
A: Tsis yog. Cov qauv rwb thaiv tsev thiab kev nkag mus deb ntawm cov khoom siv hluav taws xob sab hauv tsev yog tsim los rau kev huv hauv tsev. Sab nraum zoov ntub dej, qias neeg, thiab ultraviolet ib puag ncig yuav ua rau kom cov rwb thaiv tsev laus, ua rau muaj kev puas tsuaj los yog rwb thaiv tsev. Dedicated sab nraum zoov tam sim no transformers yuav tsum tau siv.
