Daim ntawv qhia tswv yim los xaiv txoj cai Circuit Court Breaker rau koj Transformer
Xav txog lub tshuab hloov pauv raws li lub siab - lub cav muaj zog ua haujlwm nyuaj, thiab lub tshuab hluav taws xob yog qhov tseem ceeb ntawm kev nyab xeeb limiter. Yog tias tsis muaj kev tiv thaiv zoo, txhua yam tuaj yeem mus rau sab qab teb sai - thiab peb tsis yog hais lus me me xwb. Cov hluav taws xob tsis ua haujlwm ua rau muaj kev puas tsuaj ntawm cov cuab yeej txhua xyoo, raws li cov ntaub ntawv qhia txog kev nyab xeeb hluav taws. Xaiv qhov tsis ncaj ncees lawm breaker tsis yog kev ntxhov siab xwb; nws tuaj yeem tsim teeb meem kev nyab xeeb loj thiab ua rau cov khoom siv kim meltdowns hauv vib nas this.
Yog li, ob qho no ua haujlwm ua ke li cas? Daim duab koj lub tshuab hluav taws xob zoo li cov kav dej hauv tsev. Qhov hluav taws xob yog lub siab thawb lub "dej" (hluav taws xob) los ntawm cov kav dej, thiab qhov tam sim no yog qhov tseeb txaus. Lub transformer nqis nqis uas siab - lub zog nkag mus rau hauv ib yam dab tsi uas muaj kev nyab xeeb thiab siv tau ntau dua rau koj cov khoom siv. Tab sis cov kauj ruam ntawd- cov txheej txheem nqis qis yuav tsum muaj cov neeg ua haujlwm ruaj khov saib xyuas nws txhua lub sijhawm kom ntes tau teeb meem ua ntej lawv nce ntxiv.
Kom paub meej, tuav lub tshuab hluav taws xob pheej yig tuaj yeem txuag koj ob peb bucks pem hauv ntej, tab sis qhov luv $ 50 tuaj yeem rhuav tshem tau yooj yim $ 2,000 (lossis kim dua) daim iav. Koj lub tshuab hluav taws xob yog qhov tseem ceeb ntawm tus neeg saib xyuas ntsiag to uas txiav lub hwj chim thaum lub sij hawm txhua yam pib mus rau teeb meem - cov xov hlau kub dhau, hluav taws xob, lossis phem dua. Tau txais kev xaiv txoj cai txhais tau tias sib piv cov kev tiv thaiv zoo meej rau koj qhov kev hloov pauv tshwj xeeb, yog li koj tuaj yeem pw tau yooj yim paub txhua yam npog.
(Nyem daim duab kom paub ntxiv.)
Yog vim li cas Transformers Yog "Nqhis dej" ntawm Startup: Tuav Inrush Tam Sim No
Puas tau sim thawb lub pob zeb hnyav? Nws yuav siv sij hawm pib loj heev kom nws txav mus, tab sis thaum nws dov, nws yuav tsum tau siv zog tsawg dua. Transformers ua haujlwm tib yam. Raws li inductive loads nrog magnetic coils, lawv kos ib tug loj heev surge ntawm tam sim no thaum koj xub energize lawv - hu uainrush tam sim no. Qhov no spike yog lig ib txwm, tsis yog ib qho txhaum.
Qhov teeb meem? Ntau tus qauv breakers tsis tuaj yeem qhia qhov txawv ntawm qhov kev nyab xeeb pib qhov nce siab thiab qhov luv luv tiag tiag. Yog li lawv mus tam sim ntawd lub sijhawm koj tig qhov hloov pauv, ua rau koj ntxhov siab. Qhov kev tsis txaus siab no feem ntau tshwm sim rau ob peb yam laj thawj:
Lub surge tau yuam kev rau luv luv txaus ntshai.
Lub breaker tsis muaj lub sijhawm tsim nyog - ncua sijhawm.
Koj tau tshwm sim los txhawb nws txoj cai ntawm lub ncov ntawm lub zog voj voog.
Txhawm rau zam qhov no, koj yuav tsum nkag siab thiab suav qhov xav tau tam sim no thaum ntsuas koj lub tshuab tawg. Cov kws tshaj lij feem ntau xaiv cov khoom tawg nrog cov hlau nplaum lossis cov cua sov uas tuaj yeem caij los ntawm qhov luv luv thaum tseem tiv thaiv kev phom sij tiag tiag.
Kev Tiv Thaiv Kev Nkag Nkag: Sizing Thawj Pawg Sab Nraud nrog 125% Txoj Cai
Thawj sab yog qhov twg lub hwj chim thawj zaug nkag mus rau hauv lub transformer, thiab nws yuav tsum tau muaj kev tiv thaiv kom tsis txhob muaj kev tsis ua hauj lwm sab hauv los ntawm qhov ua rau muaj kev phom sij loj dua rau tag nrho lub tsev. Cov kws hluav taws xob cia siab rau NEC cov lus qhia rau kev tiv thaiv hluav taws xob overcurrent ntawm no - cov kev cai yog tsim los xyuas kom cov xov hlau tsis muaj tam sim no ntau dua li lawv tuaj yeem ua tau yam tsis muaj cua sov.
Nws suab zoo, tab sis nws feem ntau npau taws mus rau kev ua lej ncaj nraim uas siv tus li -hu125% Txoj Cai. Yeej, koj lub breaker yuav tsum tau ntsuas los tswj txog 25% ntau dua li qhov hloov pauv ib txwm puv -load tam sim no. Nov yog cov txheej txheem yooj yim rau kev teeb tsa 480V:
Kos lub "Primary Amps" (tag nrho load tam sim no) ntawm lub transformer lub nameplate.
Muab qhov ntawd los ntawm 1.25 los tsim kom muaj kev nyab xeeb.
Yog tias qhov tshwm sim tsis yog qhov loj me me, hloov mus rau qhov muaj nyob tom ntej.
Lub cushion ntxiv no muab lub kaw lus qee chav ua pa thaum lub sijhawm ua haujlwm ib txwm muaj thiab me me, thaum tseem ncaws tawm thaum muaj xwm txheej ceev.
Tiv thaiv qhov Tawm: Vim li cas Secondary Sab Breakers tseem ceeb heev
Tus thawj breaker saib lub zog tuaj, tab sis nws tsis tuaj yeem pom tias muaj dab tsi tshwm sim tom qab qhov hluav taws xob tau nqis los. Xav txog kev ntsaws ntau lub tshuab cua sov rau hauv ib qho txuas txuas ntxiv - cord overheats maj mam los ntawm qhov xav tau ntxiv. Qhov ntawd yog ibthermal overload, thiab nws tuaj yeem ua kev puas tsuaj rau lub tshuab hluav taws xob lub coils yog tias tsis tau kuaj xyuas.
Tias yog vim li cas koj feem ntau xav tau kev tiv thaiv tshwj xeeb ntawm qhov thib ob (tso tawm) sab. Thaum lub hauv paus ua haujlwm loj, tam sim ntawd luv luv Circuit Court, lub tshuab hluav taws xob thib ob ua zoo li ceev faj cov tsheb thauj mus los rau txhua hnub. Nws mus ncig thaum qhov kev xav tau qis qis dhau los, tiv thaiv lub tshuab hluav taws xob nws tus kheej.
Kev sib koom tes ntawm ob tog yog qhov tseem ceeb. Koj tsis xav kom me me dhau ntawm ib lub qhov hluav taws xob los khob lub zog rau tag nrho lub tsev. Thawj qhov tsim nyog- kev sib koom ua ke thib ob txhais tau hais tias lub tshuab hluav taws xob thib ob yuav tsum tawm mus ua ntej ntawm cov teeb meem hauv cheeb tsam, cais qhov teeb meem yam tsis muaj kev cuam tshuam rau tag nrho lub cev.
Moulded Case vs. Nqus Breakers: Xaiv hom zoo rau koj teeb
Taug kev mus rau hauv txhua txoj kev siv hluav taws xob thiab koj yuav pom ntau txoj kev xaiv. Rau feem ntau cov haujlwm nyob hauv tsev lossis lag luam me, aMoulded Case Circuit Breaker (MCCB)yog qhov mus - mus. Nws zoo li lub tsev yas tawv tawv tiv thaiv qhov hloov pauv - pheej yig, txhim khu kev qha, thiab zoo- haum rau kev ua haujlwm qis- voltage.
Tab sis cov kev lag luam loj dua tau ntsib qhov kev sib tw sib txawv: thaum lawv mus ncig, qhov hluav taws xob siab tuaj yeem tsim cov arcs uas "dhia" zoo li mini xob laim bolts. Rau nruab nrab - thiab siab -voltage systems, engineers tig musNqus Circuit Breakers (VCBs), uas cais cov neeg nyob rau hauv lub tshuab nqus tsev chamber kom sai snuff tawm lub arc. Qee qhov kev teeb tsa siab -voltage kuj tseem siv cov roj SF6 rau rwb thaiv tsev.
Kev puas tsuaj sai los ntawm qib voltage:
MCCB: Qhov zoo tshaj plaws rau qhov hluav taws xob tsawg (feem ntau 120V–600V) - tus nqi zoo-rau- kev nyab xeeb rau kev siv txhua hnub.
VCB lub SF6: Qhov tseem ceeb rau nruab nrab / siab voltage (1,000V thiab siab dua) qhov muaj zog arc quenching tsis yog -negotiable.
Xaiv cov thev naus laus zis zoo ua rau koj tsis txhob siv nyiaj ntau ntawm cov khoom siv hnyav thaum qhov kev xaiv yooj yim dua yuav ua txoj haujlwm.
Quick Math: xam cov Load Tam sim no
Txhua lub tshuab hloov pauv muaj qhov ntsuas kVA ntawm nws daim ntawv teev npe - qhov pib nws tag nrho "horsepower." Yuav kom xaiv qhov zoo breaker, koj thawj zaug yuav tsum paub qhovTag nrho Load Tam Sim No (FLC), uas qhia koj qhov siab tshaj plaws amps thaum khiav ntawm lub peev xwm puv.
Rau ib zaug -phase systems, kev suav yog yooj yim zoo nkauj:
Siv qhov ntsuas kVA × 1,000 (kom tau watts).
Faib los ntawm qhov system voltage (piv txwv li, 240V rau ntau lub tsev teeb tsa).
Qhov ntawd muab koj lub hauv paus amps.
Piv txwv li: Yog tias koj lub tshuab hloov pauv pom nyob ib puag ncig 20-21 amps tag nrho cov load, 20A breaker tej zaum yuav tsis muaj teeb meem. Cov neeg feem coob siv 125% tus lej sib npaug rau kev nyab xeeb, tsaws ntawm qee yam xws li 30A tawg.
Koj Tsis Tau-Cov Ntawv Teev Npe Ua Tsis Taus: 5 Cov kauj ruam rau Cov Khoom Siv, Code-Ua raws cai
Koj tsis tas yuav twv ntxiv lawm. Nrog kev nkag siab zoo ntawm kev xaiv cov khoom tawg, koj tuaj yeem ntseeg siab ua tau raws li NEC cov qauv thiab teeb tsa kev tiv thaiv txhim khu kev qha. Thaum tham nrog cov neeg muag khoom lossis cov kws tsim hluav taws xob, cov lus nug tseem ceeb suav nrog: "Qhov no puas tuaj yeem ua rau kuv lub tshuab hloov pauv tam sim no?" "Lub peev xwm cuam tshuam rau qhov voltage no yog dab tsi?" thiab "Puas yog qhov sizing tag nrho NEC ua raws?"
Ua ntej energizing lub system, khiav los ntawm no ceev 5-point checklist:
Muab ob npaug rau- txheeb xyuas tias qhov kev ntsuas tus nqi sib tw yog ob qho tib si thawj thiab thib ob daim ntawv teev npe.
Paub meej tias koj cov hlau loj tuaj yeem nqa tau qhov siab tshaj plaws uas xav tau tam sim no.
Xyuas kom tag nrho cov terminals thiab kev sib txuas yog nruj kom tsis txhob muaj qhov kub.
Xyuas kom tseeb tias muaj av nyob rau hauv qhov chaw.
Kho thiab paub meej tias qhov chaw mus txawv tebchaws kom muaj kev sib koom tes zoo ntawm cov neeg tawg.
Ua li no, thiab koj qhov kev tiv thaiv transformer dhau los ua qhov tseeb "teeb nws thiab tsis nco qab nws" system - nyab xeeb, txhim khu kev qha, thiab ua raws li lub sijhawm ntev.
