Rated Breaking Capacity stands raws li ib qho tseem ceeb tshaj plaws kev nyab xeeb kev ntsuam xyuas ntawm txhua yam khoom siv tiv thaiv hluav taws xob.
Nws teev qhov siab tshaj plaws luv luv -circuit tam sim no uas lub Circuit Court breaker lossis fuse tuaj yeem cuam tshuam yam tsis muaj kev puas tsuaj loj. Daim duab nws yog qhov txwv tsis pub muaj zog ntawm koj qhov kev nyab xeeb hluav taws xob.
Qhov no tsis yog hais txog niaj hnub tam sim no ntws. Nws yog hais txog kev muaj sia nyob qhov xwm txheej phem tshaj plaws.
Xav txog nws zoo li lub tsheb nres thaum muaj xwm ceev. Cov no tsis yog tsim rau txhua hnub nres -thiab- mus tsav tsheb. Lawv tau tsim los nres lub tsheb ntawm qhov siab tshaj plaws yam tsis ua tsis tau. Txhim kho lub breaker yam tsis xav txog nws lub peev xwm tawg yog zoo li tso lub nroog - ceev nres ntawm lub tsheb uas tuaj yeem tsoo 150 mph.
Tsis nkag siab qhov kev ntsuas no tsim ib qho kev ua yuam kev txaus ntshai tshaj plaws hauv kev ua haujlwm hluav taws xob - txawm tias koj tab tom tsim, txhim kho, lossis tswj cov tshuab.
Nws ntsuas kev nyab xeeb, tsis ua haujlwm txhua hnub.
Nws qhia tau hais tias zoo npaum li cas ib lub cuab yeej tuaj yeem nres qhov cuam tshuam loj heev.
Ua qhov tsis raug no tuaj yeem ua rau hluav taws kub lossis tawg.
Core ntawm luv-Circuit Protection
Yuav kom nkag siab tias vim li cas qhov kev ntsuam xyuas no tseem ceeb heev, koj yuav tsum pom tias qhov kev sib tw luv luv tiag tiag li cas.
Lub voj voog luv luv ua rau muaj qhov tsawg kawg nkaus - txoj kev tiv thaiv hluav taws xob. Tam sim no hla qhov qub thauj khoom thiab siv txoj kev yooj yim no. Lub mov transformer sim xa tag nrho cov zog nws ua tau.
Qhov no tsis yog ib qho me me overcurrent xwb. Tam sim no tuaj yeem dhia mus rau ntau txhiab lossis kaum tawm txhiab tus amperes hauv milliseconds.
Qhov loj tam sim no tso tawm lub zog zoo kawg. Nws ua rau huab cua kub heev uas tuaj yeem yaj cov xov tooj cua tam sim thiab cov thawv steel. Nws tsim cov hlau nplaum muaj zog uas tuaj yeem khoov cov hlau tuav thiab rub cov khoom los ntawm lawv cov mounts.
Lub Circuit Court breaker yuav tsum ua nyob rau hauv milliseconds nyob rau hauv no chaotic ib puag ncig. Nws yuav tsum kuaj xyuas qhov txhaum, yuam nws cov neeg sib cuag sib nrug los ntawm kev siv tshuab, thiab tom qab ntawd tso tawm qhov siab - lub zog hluav taws xob arc uas tsim ntawm lawv.
Lub breaker yuav tsum ua txhua yam no thaum muaj cov thermal thiab sib nqus zog loj.
Rated Breaking Capacity yog cov chaw tsim khoom cog lus. Nws yog daim ntawv pov thawj lees paub tias lub cuab yeej tuaj yeem tswj cov rog no thiab tshem tawm qhov txhaum mus txog rau theem tam sim no yam tsis tau rhuav tshem nws tus kheej.
Ib lub voj voog hauv tsev tuaj yeem ntsib qhov yuam kev ntawm ob peb txhiab amps. Tab sis kev lag luam lossis kev lag luam nyob ze ntawm cov khoom siv hluav taws xob tuaj yeem pom qhov cuam tshuam ntawm 25,000A, 65,000A, lossis siab dua. Cov cuab yeej tiv thaiv yuav tsum raug ntsuas rau cov qib no.
Nkag siab Cov Ntsiab Lus Tseem Ceeb
Lo lus "kev muaj peev xwm tawg" muaj lub ntsiab lus tshwj xeeb. Cov neeg feem ntau tsis meej pem nrog lwm cov kev ntsuas hluav taws xob. Tau txais cov kev sib txawv no yog qhov tseem ceeb rau kev xaiv kom raug thiab kev nyab xeeb.
Cov qauv thoob ntiaj teb zoo li IEC 60947-2 txhais cov kev ntsuas no. Qhov no ua kom cov breakers los ntawm cov chaw tsim khoom zoo ua tau raws li cov qauv kev ua tau zoo. To taub cov no kom raug tsis yog xaiv tau.
Cov lus hauv qab no piav qhia txog qhov tseem ceeb tab sis txawv qhov sib txawv.
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Kev ntsuas |
Cim |
Nws txhais li cas |
Vim Li Cas Nws Tseem Ceeb |
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Ultimate Breaking Peev Xwm |
Icu |
Qhov siab tshaj qhov txhaum tam sim no lub breaker tuaj yeem cuam tshuam ib zaug. Cov cuab yeej tsis tau lees tias yuav ua haujlwm dua tom qab qhov xwm txheej no. |
Qhov no yog qhov kawg txwv kev nyab xeeb. Lub breaker yuav tsum muaj sia nyob los tiv thaiv kev puas tsuaj loj dua, tab sis koj yuav tau hloov nws. Nws yog qhov kev ntaus nqi "tus kheej-kev txi". |
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Service Breaking Peev Xwm |
Ics |
Ib feem ntawm Icu (xws li 50%, 75%, 100%). Lub breaker tuaj yeem cuam tshuam kev ua txhaum mus txog qib no thiab ua haujlwm ua haujlwm, npaj rov qab siv dua. |
Qhov no yog qhov kev ntsuam xyuas zoo tshaj plaws rau kev ntseeg siab ntawm qhov system. High Ics txhais tau tias tsawg downtime thiab txo nqi hloov tom qab ua txhaum. Rau cov tshuab tseem ceeb, Ics feem ntau tseem ceeb tshaj Icu. |
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Rated Ua Peev Xwm |
Icm |
Qhov siab tshaj plaws tam sim no tus breaker tuaj yeem kaw tau zoo yog tias muaj luv luv Circuit Court twb muaj lawm thaum koj hloov lub breaker rau. |
Tus nqi no tshaj Icu vim nws suav rau asymmetrical ncov ntawm AC txhaum tam sim no. Nws xyuas kom meej tias lub breaker yuav tsis vuam kaw lossis tawg yog tias kaw rau qhov txhaum. |
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Qhov ntsuas tam sim no |
Hauv |
Lub nruam tam sim no lub breaker tuaj yeem nqa mus rau qhov ntsuas kub tsis tu ncua yam tsis muaj tripping. |
Qhov no yog qhov ntsuas kev ua haujlwm rau kev tiv thaiv overload, tsis luv - tiv thaiv Circuit Court. Nws feem ntau ntsuas hauv amps (xws li 20A, 100A), tsis yog ntau txhiab amps (kA). |
Kev sib xyaw ntawm qhov ntsuas tam sim no (In) nrog kev muaj peev xwm tawg (Icu) yog qhov yuam kev yooj yim. Lub 20A breaker rau teeb pom kev zoo yuav muaj peev xwm tawg ntawm 6,000A. Ob tus lej no piav qhia txog txoj haujlwm sib txawv kiag li.
Tus yeeb ncuab tiag tiag: PSCC
Lub Circuit Court breaker lub peev xwm tawg txhais tau tias tsis muaj dab tsi los ntawm nws tus kheej. Koj yuav tsum muab piv rau qhov system qhov muaj peev xwm txaus ntshai theem.
Qhov kev phom sij no yog hu ua Prospective Short-Circuit Current, lossis PSCC.
PSCC yog qhov siab tshaj plaws tam sim no uas yuav ntws yog qhov ncaj qha, xoom- tsis kam luv Circuit Court tshwm sim ntawm ib qho tshwj xeeb hauv kev teeb tsa hluav taws xob. Nws yog qhov "muaj" txhaum tam sim no.
Tus nqi no hloov pauv thoob ib lub tsev. Peb yam tseem ceeb txiav txim siab nws.
Thawj yog qhov chaw siv hluav taws xob. Qhov luaj li cas (kVA ntsuas) thiab impedance ntawm cov khoom tseem ceeb transformer yog qhov loj tshaj plaws hauv PSCC. Cov transformers loj tuaj yeem muab ntau qhov txhaum tam sim no.
Qhov thib ob yog cov conductors. Qhov ntev, qhov loj me, thiab cov khoom siv ntawm cov cables ntawm lub transformer thiab fault point ntxiv impedance. Ntev, cov xov hlau nyias nyias nce impedance thiab txo PSCC.
Qhov thib peb yog qhov system voltage. Rau qhov muab hluav taws xob, qhov hluav taws xob siab dua feem ntau txhais tau tias qis dua PSCC.
Daim duab tam sim no uas tau qaug zog thaum nws txav deb ntawm nws qhov chaw.
[Duab: Daim ntawv qhia yooj yim uas qhia txog lub tshuab hloov pauv loj uas sau tias "High PSCC (piv txwv li, 50kA)". Ib tug xub taw qhia rau lub Rooj Tswjhwm Saib Xyuas Kev Tshaj Tawm, sau tias "Medium PSCC (piv txwv li, 25kA)". Lwm cov xub taw qhia los ntawm MDB nqes ib txoj kab ntev khiav mus rau qhov kawg sub- vaj huam sib luag, sau tias "Lower PSCC (piv txwv li, 10kA)".]
Xav txog qhov taw tes rau ntawm qhov hluav taws xob hluav taws xob hloov hluav taws xob thib ob terminals. Ntawm no, PSCC ncav cuag nws qhov siab tshaj plaws. Raws li lub zog ntws los ntawm cov keyboards tseem ceeb, nrog rau cov kab hluav taws xob hnyav, thiab mus rau hauv sub- panels, txhua qhov cuam tshuam impedance systematically txo qis qhov muaj txhaum tam sim no ntawm txhua qhov chaw.
Paub txog PSCC ntawm koj qhov chaw teeb tsa yog thawj kauj ruam tseem ceeb tshaj plaws hauv kev xaiv cov cuab yeej tiv thaiv kev nyab xeeb.
Yuav Ua Li Cas Xaiv Tau Zoo
Tsiv ntawm txoj kev xav mus rau kev xyaum, xaiv txoj cai tawg muaj peev xwm ua raws li tus txheej txheem meej. Qhov no yog qhov kev paub tseem ceeb rau txhua tus kws tshaj lij hluav taws xob.
Thawj kauj ruam ntawm txhua txoj haujlwm - txawm tias tsim tshiab lossis hloov kho vaj huam sib luag - yog tsim lub PSCC. Ua qhov tsis ncaj ncees lawm ua rau txhua qhov kev txiav txim siab tsis muaj qab hau.
Cov txheej txheem no ua kom cov cuab yeej tiv thaiv koj nruab tuaj yeem ua lawv txoj haujlwm nyab xeeb.
Nov yog cov kauj ruam - los ntawm - cov kauj ruam qhia cov kws tshaj lij siv.
Kauj Ruam 1: Txiav txim siab PSCC
Muaj ob peb txoj hauv kev pov thawj muaj nyob rau kev nrhiav Cov Lus Qhia luv luv -Circuit Current ntawm koj qhov chaw teeb tsa. Cov txheej txheem nyob ntawm qhov project complexity thiab cov cuab yeej muaj.
Cov txheej txheem meej tshaj plaws, siv los ntawm engineers thaum tsim, suav nrog cov lus qhia ntxaws. Qhov no siv cov software tshwj xeeb uas ua qauv rau tag nrho cov hluav taws xob network los ntawm qhov chaw siv hluav taws xob mus rau qhov kawg Circuit Court. Nws suav rau transformer impedance, txhua cable ntev, thiab tag nrho cov switchgear.
Rau cov kws kho hluav taws xob thiab cov kws kho mob ntawm kev teeb tsa uas twb muaj lawm, kev ntsuas ncaj qha ua haujlwm zoo tshaj plaws. Ib qho kev mob siab rau yav tom ntej luv luv-Circuit Current tester txuas rau lub voj voog rau tam sim, tiag - ntiaj teb nyeem. Qhov no yog qhov tseem ceeb rau kev txheeb xyuas thiab kev ua haujlwm.
Ib txoj hauv kev zoo, kev nyab xeeb rau cov vaj huam sib luag txoj cai qis ntawm cov transformers siv "lub npav tsis kawg" lossis qhov kev xav phem tshaj -. Ntawm no, koj siv lub transformer lub npe cov ntaub ntawv (kVA ntsuam xyuas thiab impedance feem pua) los xam qhov siab tshaj plaws tam sim no nws yuav xa. Ces xav tias tus nqi no muaj nyob rau ntawm lub ntsiab breaker, muab kev ruaj ntseg margin.
Rau kev kwv yees ceev hauv cov xwm txheej txheem, cov kws kho hluav taws xob siv tau cov rooj saib lossis cov kab kos. Cov kev cai thaiv kab hluav taws xob lossis cov chaw tsim khoom siv cov lus qhia feem ntau muab cov no, muab kwv yees PSCC qhov tseem ceeb raws li qhov loj ntawm lub tshuab hluav taws xob thiab qhov tshwj xeeb cable khiav ntev.
Kauj Ruam 2: Txoj Cai Golden
Thaum koj paub PSCC, txoj cai xaiv yog yooj yim thiab meej.
Qhov Rated Breaking Peev Xwm ntawm cov cuab yeej tiv thaiv yuav tsum sib npaug lossis tshaj qhov luv luv -Circuit Current ntawm nws qhov chaw teeb tsa.
Qhov no yog txoj cai golden ntawm luv luv - tiv thaiv Circuit Court. Nws yog lub hauv paus ntsiab lus ntawm kev nyab xeeb hluav taws xob.
Qhia qhov no raws li tus qauv yooj yim:
Icu Ntau dua lossis sib npaug rau PSCC
Yog tias PSCC ntawm lub vaj huam sib luag suav rau 8,500A, tus qauv 6,000A (6kA) breaker yog qhov txaus ntshai tsis txaus. Qhov tsawg kawg nkaus kev lees paub yuav muaj qhov ntsuas 10,000A (10kA). Xaiv qhov kev ntsuas siab dua, zoo li 15kA, ib txwm muaj kev nyab xeeb, txawm tias muaj peev xwm kim dua.
Kauj Ruam 3: Xav txog qhov System Coordination
Hauv cov tshuab hluav taws xob nyuaj, cov txheej txheem siab heev hu ua cascading (lossis kev tiv thaiv thaub qab) tuaj yeem siv.
Lub tswv yim no tso cai rau cov neeg tawg rog qis qis qis dua li PSCC muaj nyob ntawm lawv qhov chaw. Qhov no tsuas yog ua haujlwm yog tias lub tshuab hluav taws xob sab saud uas muaj peev xwm tawg txaus txaus tau raug pov thawj (los ntawm cov chaw tsim khoom kuaj thiab cov rooj) los tiv thaiv lawv.
Thaum lub sijhawm ua txhaum cai li no, tus pas dej ntws tawm tuaj yeem pab txwv tag nrho lub zog cia- dhau los, tiv thaiv cov khoom siv qis los ntawm qhov tam sim no nws tsis tuaj yeem ua haujlwm ib leeg.
Qhov no yog lub tswv yim tsim qauv siv los ntawm engineers los ua kom zoo dua tus nqi thiab kev ua tau zoo hauv cov tshuab xa khoom loj. Nws yuav tsum tau ua tib zoo kawm txog cov chaw tsim khoom- cov rooj sib koom ua ke tshwj xeeb thiab yuav tsum tsis txhob xav.
Kauj ruam 4: Txheeb xyuas qhov Xaiv
Cov kauj ruam kawg yog kev txheeb xyuas lub cev. Tsis txhob xav tias tus ntaus ntawv ntaus nqi.
Ua ntej yuav txhim kho ib qho hluav taws xob hluav taws xob, ib txwm tshuaj xyuas lub cuab yeej nws tus kheej. Lub peev xwm tawg yog luam tawm ntawm lub ntsej muag lossis sab.
Hla -hais tus lej no nrog koj tus lej ntsuas lossis ntsuas PSCC tus nqi. Paub meej tias tus breaker qhov ntsuas voltage kuj haum rau qhov system. Qhov kev kuaj zaum kawg no tiv thaiv kev teeb tsa tsis raug nqi thiab txaus ntshai.
Kev phom sij ntawm Undersizing
Yuav ua li cas thaum koj ua txhaum txoj cai golden? Dab tsi yog qhov tshwm sim ntawm lub cev thaum yav tom ntej luv luv -Circuit Currents tshaj lub breaker's Rated Breaking Capacity?
Qhov tshwm sim tsis yog tsuas yog tripped breaker. Qhov tshwm sim yog tsausmuag, kev puas tsuaj loj ntawm lub cuab yeej nws tus kheej. Ib lub cuab yeej ntsia rau kev tiv thaiv dhau los ua qhov chaw tshiab, muaj kev phom sij tam sim ntawd.
Thaum lub breaker sim cuam tshuam qhov txhaum tam sim no tshaj nws cov ntawv pov thawj txwv, nws ntsib lub zog nws tsis tau tsim los daws. Qhov no tsim ntau hom kev ua tsis tiav.
Hu rau Vuam
Cov cua kub loj heev los ntawm cov hluav taws xob arcs tuaj yeem yaj lub breaker sab hauv cov neeg sib cuag. Es tsis txhob sib cais, lawv welded rau hauv ib qho, cov khoom ntawm cov hlau. Cov cuab yeej "tiv thaiv" tau ua tsis tiav - kaw, ruaj khov mus tas li ntawm qhov luv luv thiab lav cov khoom hauv qab yuav ua rau kub dhau thiab ntes hluav taws.
Arc Flash thiab tawg
Tsis tuaj yeem muaj qhov siab thiab qhov kub thiab txias ntawm lub arc, lub breaker vaj tse ruptures. Lub foob pob tawg ua rau cov pa hluav taws xob superheated, molten hlau, thiab ntshav plasma - arc flash - ntawm qhov ceev tsis txaus ntseeg. Qhov no tuaj yeem ua rau tuag taus, tsis hnov lus los ntawm kev tawg, thiab raug mob hnyav los ntawm shrapnel.
Hluav taws kub thiab downstream puas
Txawm hais tias breaker tsis ua hauj lwm tsis tshua muaj tawg, nws tsis muaj peev xwm tshem tau qhov txhaum txhais tau hais tias luv luv - tam sim no txuas ntxiv ntws. Qhov tam sim no sai heev overheats tag nrho cov kab hauv qab thiab cov khoom siv txuas nrog. Rwb thaiv tsev vaporizes, thiab hluav taws yuav zoo li inevitable. Cov cuab yeej txhais tau tias tiv thaiv qhov no dhau los ua qhov ua rau ncaj qha.
Lub undersized breaker tsis yog ib feem uas yuav ua tsis tau. Nws yog ib feem tau lees tias ua tsis tiav thaum hu rau nws ib txoj haujlwm tseem ceeb.
Nyeem daim ntawv lo
Txoj kev xav tsis muaj txiaj ntsig yam tsis siv nws rau cov khoom siv tiag tiag. Hmoov zoo, cov tuam txhab lag luam yuav tsum qhia meej meej tias muaj peev xwm tawg ntawm txhua qhov khoom siv tiv thaiv hluav taws xob.
Qhov ntsuas yuav luag ib txwm tshwm sim ntawm lub ntsej muag lub ntsej muag, txawm hais tias hom ntawv tseeb txawv nyob ntawm tus qauv tswj hwm (IEC lossis NEMA / UL).
Rau cov cuab yeej ua raws li cov qauv IEC, muaj nyob hauv Europe, Asia, thiab ntau lwm thaj chaw, qhov kev ntsuas feem ntau pom hauv daim duab plaub me me. Nws tshwm sim raws li tus lej xws li 6000 lossis 10000, sawv cev muaj peev xwm hauv Amperes (6kA lossis 10kA feem). Nws tuaj yeem sau meej meej nrog lub cim Icu.
[Duab: Ib daim duab piav qhia ntawm IEC-style miniature circuit breaker (MCB). Ib tug xub taw qhia rau ib lub thawv nyob rau pem hauv ntej uas hais tias "10000", nrog ib lub npe: "IEC Breaking Capacity: 10,000 Amperes (10kA)".]
Hauv North America, raws li NEMA / UL cov qauv, qhov ntsuas feem ntau tshwm sim li AIC, lub ntsiab lus Amperes cuam tshuam lub peev xwm. Qhov no functionally sib npaug kev muaj peev xwm tawg. Tus nqi tshwm hauv ntau txhiab Amperes, xws li 10kA, 22kA, lossis 65kA AIC.
[Duab: Ib daim duab piav qhia ntawm NEMA/UL{0}}style molded case circuit breaker (MCCB). Ib tug xub taw qhia rau ib daim ntawv lo uas hais tias "65kA AIC", nrog lub npe: "NEMA/UL Interrupting Capacity (AIC): 65,000 Amperes".]
Tsis hais hom twg, tus lej no yog tus yuam sij rau kev nyab xeeb daim ntawv thov. Nco ntsoov nrhiav thiab txheeb xyuas nws ua ntej kev teeb tsa.
Koj Thawj Kab Kev Tiv Thaiv
Lub tswvyim ntawm Rated Breaking Capacity tsis yog kev kawm paub meej. Nws yog lub hauv paus ntawm kev nyab xeeb hluav taws xob.
Ib txwm ua raws li txoj cai golden: breaker breaker muaj peev xwm yuav tsum sib npaug los yog tshaj qhov kev cia siab ntawm qhov luv luv -circuit tam sim no. Qhov no tsis yog negotiable.
Txhawm rau kom muaj kev nyab xeeb thiab kev ntseeg siab, nco ntsoov cov ntsiab cai tseem ceeb no:
Rated Breaking Capacity yog qhov ntsuas kev nyab xeeb, tsis ua haujlwm. Nws ntsuas cov cuab yeej muaj peev xwm kom muaj sia nyob cuam tshuam luv luv circuits.
Xaiv qhov kev ntsuas kom raug yog tsis yooj yim sua yam tsis tau paub ua ntej koj lub kaw lus Prospective Short-Circuit Current (PSCC).
Ib qho hluav taws xob tsis zoo yog qhov kev puas tsuaj loj uas tos kom tshwm sim, nrog rau qhov tshwm sim los ntawm cov khoom siv puas tsuaj mus rau hluav taws thiab raug mob hnyav.
Ib txwm txheeb xyuas qhov ntsuas ntsuas ntawm lub cuab yeej ua ntej kev teeb tsa.
Kev xaiv thiab siv cov kab hluav taws xob hluav taws xob raws li qhov muaj peev xwm tawg yog lub luag haujlwm tseem ceeb. Nws yog thawj thiab tseem ceeb tshaj plaws ntawm kev tiv thaiv tiv thaiv kev puas tsuaj lub zog ntawm luv luv - Circuit Court faults.
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