3-Phase Transformer: Kev Sib Txuas, Sizing & Yuav Qhia

3-Phase Transformer Guide: Nws ua haujlwm li cas, kev sib txuas, thiab xaiv li cas

A 3-theem transformer(feem ntau tshawb tau li "3 transformer") theem voltage nce lossis nqis hauv peb -theem fais fab tshuab siv thoob plawscov tsev lag luam, cov chaw tsim khoom lag luam, cov chaw khaws ntaub ntawv, thiab infrastructure. Nws tuaj yeem yog ibib leeg integrated unitlos yogib lub txhab nyiaj ntawm peb ib zaug -theem transformerstxuas los tsim peb -theem system.

Cov lus qhia no piav qhia txog qhov 3-theem transformer yog dab tsi, nws ua haujlwm li cas ntawm qib siab, kev sib txuas feem ntau (Delta -Wye, Wye-Delta, Delta-Delta, Wye-Wye), qhov sib txawv ntawm qhov sib txawv ntawm ib qho peb -theem chav tsev thiab lub txhab nyiaj hloov pauv, cov ntsiab lus tseem ceeb rau kev yuav khoom, kev txiav txim siab qhov loj me, cov ntawv thov raug, thiab cov qauv. Siv nws kom nqaim cov kev xaiv ua ntej thov kev tsocai lossis tham nrog tus kws tshaj lij.

A 3-theem transformer hloov hluav taws xob hluav taws xob ntawm qhov sib txawv voltage theem hauv peb-theem system thaum tswj cov120 degreetheem kev sib raug zoo ntawm peb ceg. Nws muaj cov thawj thiab theem nrab windings magnetically ua ke los ntawm ib tug sib koom los yog multiphase tub ntxhais.

Nws tshwm nyob rau hauv ob hom:

Ib qho peb -phase unit nrog tag nrho cov windings thiab core nyob rau hauv ib lub thawv.

Ib lub txhab nyiaj ntawm peb ib zaug -theem transformers uas nws cov terminals yog interconnected los tsim ib tug sib npaug peb-theem system.

Ob leeg xa peb -theem zog; qhov kev xaiv nyob ntawm tus hneev taw, tus nqi, kev xav tau rov ua dua, kev txwv shipping, thiab kev nyiam saib xyuas.

Lub zog hloov pauv nyob ntawmelectromagnetic induction. Hloovtam sim no nyob rau hauv thawj windings tsim ib tug hloov magnetic flux nyob rau hauv lub core.

Qhov no flux induces voltage nyob rau hauv lub thib ob windings. Qhov kev hloov pauv ntawm thawj thiab theem nrab txiav txim siab qhov hloov pauv voltage (theem-nce lossis qib- nqis).

In a balanced three-phase system the three phase currents and voltages are equal in magnitude and displaced by 120 electrical degrees. A properly designed 3-phase transformer preserves this balance while changing voltage levels. Efficiency is typically high (often >98% ntawm tag nrho cov load rau niaj hnub units), txwv tsuas yog los ntawmtooj liab losses, core poob, thiab stray losses.

Hom kev sib txuas txiav txim siab seb anruab nrabmuaj, ua li casxoom- ntu ntu tam sim nocoj tus cwj pwm, thiab haum rau cov khoom sib txawv. Kev xaiv yog qhov system- thiab daim ntawv thov- nyob ntawm- nrog rau tus kws tsim qauv tsim nyog rau kev tsim zaum kawg.

Delta-Wye (Δ-Y)

Kev teeb tsa nquag tshaj plaws rau kev lag luam thiab teeb pom kev zoo - kauj ruam kev lag luam -kev pabcuam. Lub hauv paus delta tshem tawm qhov xav tau ntawm qhov nruab nrab nruab nrab; Secondary wye muab kev ruaj ntseg nruab nrab rau120 Vlos yog277 Vib zaug -theem loads thiab yooj yim rau hauv av.

Wye-Delta (Y-Δ)

Feem ntau siv thaum nce voltage nce lossis pub khoom noj uas tsis tas yuav muaj qhov nruab nrab nruab nrab. Lub hauv paus nruab nrab tuaj yeem yog av.

Delta-Delta (Δ-Δ)

Txaus siab rau hauv qee qhov txuas ntxiv - txheej txheem kev lag luam. Tsis muaj qhov nruab nrab ua kom yooj yim rau qee yam qauv; lub configuration tuaj yeem zam qhov qhib winding nyob rau hauv cov xwm txheej tsawg thaum tseem ua haujlwm ntawm lub peev xwm txo.

Wye-Wye (Y-Y)

Siv tsawg dua vim muaj av thiab kev sib haum xeeb / xoom- coj tus cwj pwm. Thaum ua hauj lwm, ob qho tib si nruab nrab feem ntau yog hauv av thiab yuav tsum muaj kev txo qis ntxiv.

Kev xaiv kev sib txuas cuam tshuam rau hauv av, kev ua txhaum tam sim no, thiab kev ua haujlwm sib haum xeeb. Nco ntsoov xyuas qhov project specifications thiab cov lis dej num hauv zos. Tham nrog tus engineer ua ntej ua tiav.

Ib qho peb -theem chav tsev feem ntau nyiam rau kev teeb tsa tshiab uas qhov chaw, kev ua tau zoo, thiab tus nqi thawj zaug. Ib lub txhab nyiaj ntawm peb ib zaug -theem theem tuaj yeem ua tau zoo rau cov haujlwm hloov pauv, txwv kev siv crane, lossis cov ntawv thov xav tau ib nrab rov ua dua.

Qhia lossis paub meej txog cov kev txwv no thaum thov kev tsocai:

kVA ntsuas- tsis tu ncua muaj peev xwm (nrog cov paj tsim nyog).

Thawj thiab theem nrab voltage - e.g., 480 V Δ – 208Y/120 V.

Ntau zaus- 60 Hz (North America) los yog 50 Hz.

Impedance (% Z)- cuam tshuam rau tam sim no thiab kev tswj hluav taws xob.

Rwb thaiv tsev chav kawm thiab kub nce- Piv txwv li, 150℃nce / 220℃chav kawm.

Txias- AN (air natural), AF (air forced), los yog kua -cov khoom sib npaug.

Suab theem- tseem ceeb rau cov tsev nyob.

Cov kais dej- feem ntau ± 2 × 2.5% lossis zoo sib xws rau kev hloov pauv voltage.

Npog- NEMA 1 (hauv tsev), 3R (sab nraum zoov), 12 (plua plav-tight), los yog IEC IP sib npaug.

Cov khoom siv winding- tooj liab lossis txhuas.

Kev ua tau zoo- DOE 2016 (US) lossis IEC Ecodesign cov cai.

Tshwj xeeb nta- K-factor rating for nonlinear loads, electrostatic shields, low inrush designs, thiab lwm yam.

Xam lossis ntsuas tag nrho cov khoom txuas txuas hauv kVA (los yog kW thiab lub zog ua haujlwm).

Siv ntau haiv neeg thiab xav tau yam uas tsim nyog rau qhov chaw.

Ntxiv cov paj rau kev loj hlob yav tom ntej (feem ntau 20-25% lossis ntau dua).

Account rau lub cev muaj zog pib / inrush tam sim no thiab harmonic{0}} tsim cov loads (VFDs,UPS systems, LED tsav tsheb). Nonlinear loads yuav xav tau ibK- ntsuaslos yog oversized unit.

Piv txwv nkaus xwb(project-xws li tshwj xeeb yuav tsum tau): Ib qho chaw uas muaj kwv yees li 60 kVA nruam load thiab nruab nrab lub cev muaj zog pib yuav xaiv 75 kVA unit. Kev ntsuas zaum kawg yuav tsum ua raws li cov cai siv, cov txheej txheem tsim khoom, thiab kev txiav txim siab engineering.

Cov tsev lag luam- Kev faib tawm rau lub teeb pom kev zoo, HVAC, thiab cov khoom siv hluav taws xob (feem ntau 480–208Y / 120 V).

Cov nroj tsuag muaj- lub cev muaj zog loads, txheej txheem khoom, thiab cog kev faib tawm.

Cov chaw zov me nyuam- UPS input/output,PDU khoom; saib rauharmonicsthiab K-factor.

Renewable thiab EV infrastructure- kauj ruam- nce lossis nqis - nqis ntawm hnub ci, roj teeb, lossis chaw them nyiaj (qhov twg siv tau).

Institutional thiab kho mob- kev faib hluav taws xob txhim khu kev qha nrog kev nruj hauv av thiab kev cais tawm.

North America: IEEE / ANSI C57 series, NEMA, UL lossis CSA daim ntawv teev npe, DOE kev ua haujlwm zoo (DOE 2016 rau ntau qhov qhuav- hom units).

Thoob ntiaj tebIEC 60076 series, EN cov qauv, Ecodesign efficiency yuav tsum.

Paub meej tias txoj cai siv hauv zos, cov cai tswj kev siv hluav taws xob sib txuas, thiab txhua qhov project-cov lus qhia tshwj xeeb (seismic, qhov siab, qhov kub thiab txias).

"3 transformer" feem ntau txhais li cas?Kev tshawb nrhiav feem ntau yog hais txog 3-theem transformer. Nws tuaj yeem txhais tau tias lub txhab nyiaj ntawm peb ib zaug -theem transformers txuas rau peb-theem kev pabcuam.

Dab tsi yog qhov feem ntau 3-theem transformer txuas?Delta–Wye (Δ–Y) rau kev lag luam kauj ruam- kev pabcuam qis uas xav tau qhov nruab nrab nruab nrab.

Puas yog delta-wye transformer muab qhov nruab nrab?Yog - nyob rau theem nrab (wye) sab.

Kuv puas tuaj yeem siv peb ib zaug -theem transformers los ua 3-theem?Yog lawm. Kev sib raug zoo tsim nyog tsim ib qho kev ua haujlwm peb -theem bank.

Qhov twg yog pheej yig dua: transformer bank lossis ib qho 3-theem transformer?Ib qho peb -theem chav tsev feem ntau yog qis dua thawj tus nqi rau tib kVA, txawm hais tias qhov chaw- cov yam ntxwv tshwj xeeb (kev xa khoom, kev teeb tsa, rov ua dua) tuaj yeem hloov pauv tag nrho cov nqi ntawm cov tswv cuab.

Yuav ua li cas kuv xam kVA rau 3-theem load?kVA=(√3 × V_line × I_line) / 1000. Cov nyiaj tau los ua tib zoo thiab siv cov kev xav tau / ntau yam.

Puas yog 3-theem transformers ua haujlwm nrog VFD / UPS loads?Yog, tab sis nonlinear loads tsim harmonics. Qhia meej K-factor rated los yog tsim nyog oversized units thiab txiav txim siab lim los yog txo.

Transformer impedance yog dab tsi thiab vim li cas nws tseem ceeb?% Z qhia tias qhov hluav taws xob poob qis hauv kev thauj khoom thiab txwv tsis pub muaj tam sim no. Nws cuam tshuam kev tiv thaiv kev sib koom tes thiab kev tswj hwm qhov hluav taws xob.

Puas yog qhov qhuav - hom lossis kua - puv chav tsev zoo dua?Qhuav- hom (cam khwb cia resin lossis ventilated) muaj nyob hauv tsev thiab qhov twg muaj kev txhawj xeeb txog hluav taws. Cov kua ua kua- cov chav ntim puv feem ntau ua haujlwm sab nraum zoov lossis siab dua -kVA daim ntawv thov. Kev xaiv nyob ntawm qhov chaw, ib puag ncig, thiab cov lej.

Kuv puas xav tau qhov nruab nrab?Yog tias ib zaug - theem loads lossis hauv av muaj nyob rau ntawm theem nrab, ib qho wye theem nrab (muab qhov nruab nrab) feem ntau yuav tsum tau.

Npaj los qhia ib chav lossis sib piv cov kev xaiv? Muab cov lus hauv qab no kom nrawm dua, raug tshaj tawm:

Yuav tsum tau kVA

Thawj thiab theem nrab voltage (thiab kev sib txuas yog paub)

Neutral xav tau?

Nyob sab hauv tsev lossis sab nraum zoov qhov chaw + nyiam qhov ntsuas qhov thaiv

Ntau zaus (50/60 Hz)

Ib qho impedance, qhov siab, lossis kev txwv ambient

Nonlinear loads (VFD, UPS, thiab lwm yam)

Kev ua tau zoo lossis cov npe yuav tsum tau ua

Ntau thiab xav tau lub sijhawm ua khoom lag luam

Tau txais 3-theem Transformer Quotelos yogTham nrog ib tug engineeryog tias koj tsis paub meej txog kev sib txuas, qhov loj me, lossis cov ntsiab lus ntawm daim ntawv thov. Kev xaiv zaum kawg thiab kev teeb tsa yuav tsum tau ua los ntawm cov kws tshaj lij uas tsim nyog raws li cov cai siv tau thiab cov lus qhia ntawm cov chaw tsim khoom.

Hu rau tam sim no