Kev xaiv thiab teeb tsa cov ntsiab lus ntawm Circuit Breakers

Kev xaiv ntawm Circuit Court breakers yuav tsum ua raws li cov kev ua haujlwm tiag tiag, suav nrog kev siv qeb, ntsuas kev ua haujlwm voltage, ntsuas tam sim no, ntsuas qhov ntsuas tam sim no ntawm kev tso tawm, thiab lwm yam tsis muaj. Cov yam ntxwv tiv thaiv yuav tsum raug xaiv raws li kev tiv thaiv tus yam ntxwv nkhaus uas muaj nyob rau hauv cov khoom catalog, thiab luv luv - cov yam ntxwv ntawm Circuit Court thiab rhiab heev coefficient yuav raug txheeb xyuas.

Classification ntawm Circuit Breakers

(1) Cua Circuit Breaker (ACB)

ACB tseem hu ua universal circuit breaker. Tag nrho cov khoom yog mounted nyob rau hauv ib tug insulated hlau ncej, feem ntau yog qhib hom. Nws tuaj yeem nruab nrog ntau yam khoom siv, thiab kev hloov ntawm kev sib cuag thiab qhov chaw yog yooj yim. Nws feem ntau yog siv los ua lub ntsiab hloov ntawm lub hwj huam mov sab.

Tshaj - cov kev tso tawm tam sim no suav nrog cov khoom siv hluav taws xob, hluav taws xob thiab hom ntse. Lub Circuit Court breaker muab plaub-theem tiv thaiv: ntev- ncua sij hawm, luv luv- lub sij hawm ncua, instantaneous thiab lub ntiaj teb txhaum tiv thaiv.Qhov teeb tsa tus nqi ntawm txhua qhov kev tiv thaiv tuaj yeem hloov kho nyob rau hauv ib qho kev ntsuas raws li nws qhov kev ntsuam xyuas.

ACB muaj feem xyuam rau AC 50 Hz, ntsuas qhov hluav taws xob 380 V, 660 V, thiab cov khoom xa tawm nrog cov ntsuas tam sim no los ntawm 200 A txog 6300 A.Nws yog siv rau kev faib hluav taws xob thiab kev tiv thaiv kab thiab cov khoom siv hluav taws xob tiv thaiv overload, undervoltage, luv -circuit, ib zaug - fase earth

Nrog rau ntau yam kev tiv thaiv kev txawj ntse, nws tuaj yeem paub txog kev tiv thaiv kev tiv thaiv.Raws li ib txwm muaj, nws tuaj yeem siv rau kev hloov pauv tsis tu ncua ntawm circuits.Breakers hauv qab 1250 A tuaj yeem siv los tiv thaiv cov motors tiv thaiv overload thiab luv Circuit Court hauv 380 V AC 50 Hz tes hauj lwm.

ACB feem ntau yog siv los ua qhov hloov pauv tseem ceeb ntawm 400 V sab ntawm transformers, tsheb npav khi keyboards, loj - muaj peev xwm feeder keyboards thiab loj lub cev muaj zog tswj keyboards.

(2) Moulded Case Circuit Breaker (MCCB)

MCCB tseem hu ua modular Circuit Court breaker. Nws grounding davhlau ya nyob twg, sab nraud tiv tauj, arc extinguishing chamber, tso tawm thiab kev khiav hauj lwm mechanism yog kaw nyob rau hauv ib tug yas molded rooj plaub.

Kev sib tiv tauj, kev tso tawm undervoltage, shunt tso tawm thiab lwm yam khoom siv feem ntau yog modularized nrog cov qauv compact heev. Feem ntau, kev saib xyuas tsis suav nrog, thiab nws yog qhov tsim nyog rau cov ceg tiv thaiv kev tiv thaiv cov keyboards.

MCCB feem ntau muaj cov thermal-magnetic trip unit, thaum loj- loj MCCBs tau nruab nrog cov khoom siv hluav taws xob- xeev mus txawv tebchaws.

Tshaj -tam sim no tshaj tawm rau MCCB suav nrog cov khoom siv hluav taws xob thiab hluav taws xob.Feem ntau, electromagnetic MCCBs tsis yog- xaiv Circuit Court breakers nrog tsuas yog ntev- ncua sij hawm thiab tiv thaiv tam sim no.Electronic MCCBs muab plaub txoj haujlwm tiv thaiv: ntev- ncua sij hawm, luv - lub sij hawm ncua, instantaneous thiab tiv thaiv lub ntiaj teb txhaum.

Qee cov khoom siv hluav taws xob tshiab MCCBs kuj tau nruab nrog thaj tsam xaiv sib cuam tshuam (ZSI) muaj nuj nqi.

MCCB feem ntau yog siv rau kev faib feeder tswj thiab kev tiv thaiv, lub ntsiab qis -voltage outgoing switchers me me transformers, fais fab faib davhlau ya nyob twg tswj, thiab kuj yuav siv tau raws li lub hwj chim hloov rau ntau lawm machinery.

(3) Miniature Circuit Breaker (MCB)

MCB yog cov khoom siv dav dav siv dav dav hauv kev tsim hluav taws xob hauv hluav taws xob hluav taws xob.Nws yog siv rau luv luv -circuit, overload, overvoltage thiab lwm yam kev tiv thaiv rau ib zaug -theem thiab peb-theem circuits hauv qab 125 A, suav nrog 1P, 2P, 3P thiab 4P ncej.

MCB muaj cov txheej txheem kev khiav hauj lwm, kev sib cuag, cov cuab yeej tiv thaiv (ntau qhov kev tso tawm), arc extinguishing system, thiab lwm yam.Nws cov neeg tseem ceeb raug kaw manually lossis hluav taws xob.Tom qab kaw, qhov kev mus ncig dawb mechanism kaw cov neeg sib cuag tseem ceeb hauv txoj haujlwm kaw.

Cov coils ntawm tshaj -tam sim no tso tawm thiab cov ntsiab lus thermal ntawm cov thermal tso tawm yog txuas nrog hauv series nrog lub ntsiab Circuit Court.Cov coils ntawm undervoltage tso tawm yog txuas nrog nyob rau hauv parallel nrog lub hwj chim mov.

Hauv kev tsim hluav taws xob hauv tsev tsim hluav taws xob, MCB feem ntau yog siv rau overload, luv-circuit, dhau-tam sim no, poob ntawm qhov hluav taws xob, undervoltage, earthing, av to, tsis siv neeg hloov khoom siv hluav taws xob dual, thiab kev tiv thaiv thiab tswj cov motors thaum pib tsis tshua muaj.

Cov yam ntxwv tseem ceeb ntawm Circuit Breakers

(1) Rated Ua Haujlwm Voltage Ue

Rated ua hauj lwm voltage yog lub nominal voltage ntawm lub Circuit Court breaker, nyob rau hauv uas nws muaj peev xwm ua hauj lwm tsis tu ncua raws li ib txwm kev pab cuam thiab kev ua tau zoo tej yam kev mob.

Hauv Suav teb, rau qib voltage ntawm 220 kV thiab qis dua, qhov siab tshaj plaws kev khiav hauj lwm voltage yog1,15x uaqhov system ntsuas voltage.Rau qhov voltage ntawm 330 kV thiab siab dua, qhov siab tshaj plaws kev khiav hauj lwm voltage yog1.1x uaqhov ntsuas voltage.

Lub Circuit Court breaker yuav tsum tswj cov rwb thaiv tsev ntawm qhov system siab tshaj plaws kev khiav hauj lwm voltage thiab muaj peev xwm ua thiab tawg ua haujlwm raws li cov xwm txheej.

(2) Rated Tam sim no Hauv

Rated tam sim no yog qhov tam sim no uas qhov kev tso tawm tuaj yeem nqa tsis tu ncua ntawm qhov ntsuas kub hauv qab 40℃.Rau Circuit Court breakers nrog adjustable tso tawm, nws yog qhov siab tshaj plaws tam sim no uas qhov tso tawm tuaj yeem nqa tsis tu ncua.

Thaum siv ntawm qhov kub thiab txias tshaj 40℃tab sis tsis siab tshaj 60 degree, lub load yuav tsum derated rau kev ua haujlwm tas mus li.

(3) Tshaj Tawm Tshaj Tawm Tam Sim No Qhov Chaw Ir

Thaum qhov tam sim no tshaj qhov overload tso tawm qhov chaw Ir, lub Circuit Court breaker mus nrog lub sij hawm ncua.Qhov no tus nqi kuj sawv cev rau qhov siab tshaj plaws tam sim no uas lub Circuit Court breaker nqa tau yam tsis muaj tripping.

Tus nqi no yuav tsum ntau dua qhov siab tshaj qhov load tam sim no Ib, tab sis tsawg dua qhov siab tshaj plaws tso cai tam sim no Iz ntawm lub voj voog.

Rau thermal-magnetic tso tawm, Ir feem ntau yog kho tau nyob rau hauv thaj tsam ntawm 0.7 ~ 1.0 In.Rau cov khoom siv hluav taws xob, qhov kev hloov kho tau dav dua, feem ntau yog 0.4 ~ 1.0 In.For circuit breakers nruab nrog tsis yog - kho tau tshaj - tawm tam sim no, Ir=Hauv.

(4) Luv-Circuit Release Tam sim no Setting Im

luv- Circuit Court tso relays (instantaneous los yog luv luv- lub sij hawm ncua) yog siv los mus rau lub Circuit Court breaker sai heev thaum muaj teeb meem tam sim no. Qhov pib tripping yog Im.

(5) Rated Short-Lub Sij Hawm Nrog Tam Sim No Icw

Qhov no yog tus nqi tam sim no tso cai rau ntws thaum lub sijhawm teev tseg, uas yuav tsis ua rau muaj kev puas tsuaj rau cov conductors vim overheating nyob rau hauv lub sijhawm teev.

(6) Lub peev xwm tawg

Lub peev xwm tawg ntawm lub Circuit Court breaker yog hais txog nws lub peev xwm los cuam tshuam kev txhaum tam sim no, uas tsis tas yuav cuam tshuam nrog nws qhov ntsuas tam sim no.

Cov kev ntsuas feem ntau suav nrog 36 kA, 50 kA, thiab lwm yam.Nws feem ntau muab faib ua:

Qhov kawg luv -Circuit Breaking Capacity Icu

Kev Pabcuam luv -Circuit Breaking Capacity Ics

 

Cov ntsiab cai dav dav rau kev xaiv Circuit Breaker

Ua ntej, xaiv qhovhomthiabpes tsawg tus ncejntawm Circuit Court breaker raws li daim ntawv thov;

xaiv covntsuas tam sim noraws li qhov siab tshaj plaws ua haujlwm tam sim no;

xaiv covhom kev tso tawm, hom thiab specifications ntawm accessories raws li xav tau.

Cov kev cai tshwj xeeb yog raws li hauv qab no:

⑴Qhov ntsuas kev ua haujlwm voltage (Ue) ntawm lub Circuit Court breaker Ntau dua lossis sib npaug ntawm qhov ntsuas hluav taws xob ntawm lub voj voog.

⑵ Cov ntsuas luv luv- Circuit Court ua thiab tawg muaj peev xwm ntawm Circuit Court breaker Ntau dua los yog sib npaug rau cov xam load tam sim no ntawm Circuit Court.

⑶ Qhov ntsuas luv luv- Circuit Court ua thiab tawg muaj peev xwm ntawm Circuit Court breaker Ntau dua los yog sib npaug rau qhov siab tshaj plaws luv luv -circuit tam sim no uas yuav tshwm sim hauv Circuit Court (feem ntau xam raws li tus nqi RMS).

⑷The single-theem earth fault current at the circuit end>=1.25 times in instantaneous (los yog luv-sij hawm ncua) tripping setting tam sim no ntawm Circuit Court breaker.

⑸ Lub ntsuas hluav taws xob ntawm qhov kev tso tawm ntawm qhov hluav taws xob hluav taws xob yog sib npaug ntawm qhov ntsuas hluav taws xob ntawm lub voj voog.

⑹ Lub ntsuas hluav taws xob ntawm shunt tso tawm ntawm lub Circuit Court breaker yog sib npaug rau kev tswj fais fab mov voltage.

⑺ Cov ntsuas kev ua haujlwm ntawm lub cev muaj zog ua haujlwm yog sib npaug rau kev tswj fais fab mov voltage.

⑻Thaum lub tshuab hluav taws xob siv hluav taws xob siv rau cov teeb pom kev zoo, qhov chaw tam sim no ntawm cov hluav taws xob tso tawm feem ntau yog6x ualub load tam sim no.

⑼Thaum lub tshuab hluav taws xob siv rau luv luv - tiv thaiv Circuit Court ntawm ib lub cev muaj zog:

Instantaneous tripping teem tam sim no =1.35 zaug lub cev muaj zog pib tam sim no (rau DW series) lossis 1.7 npaug ntawm lub cev muaj zog pib tam sim no (rau DZ series).

⑽Thaum lub tshuab hluav taws xob siv rau luv luv - tiv thaiv Circuit Court ntawm ntau lub cev muaj zog:

Instantaneous tripping teeb tsa tam sim no =1.3 lub sij hawm pib tam sim no ntawm lub loj tshaj plaws motorplus qhov kev khiav hauj lwm tam sim no ntawm seem motors.

⑾Thaum lub tshuab hluav taws xob siv hluav taws xob siv los ua qhov hloov pauv tseem ceeb ntawm qhov qis -voltage sab ntawm lub tshuab hluav taws xob faib khoom:

●Nws lub peev xwm tawg yuav tsum ntau dua qhov luv -circuit tam sim no nyob rau qis-voltage sab ntawm lub transformer.

● Qhov ntsuas tam sim no ntawm qhov tso tawm yuav tsum tsis txhob tsawg dua qhov ntsuas tam sim no ntawm lub tshuab hloov pauv.

● Luv- Circuit Court tiv thaiv teeb tsa tam sim no: feem ntau 6–10 npaug ntawm qhov ntsuas tam sim no ntawm lub tshuab hloov pauv.

● Overload tiv thaiv teeb tsa tam sim no: sib npaug rau qhov ntsuas tam sim no ntawm lub tshuab hloov pauv.

⑿ Tom qab ua ntej xaiv hom thiab kev ntsuam xyuas ntawm Circuit Court breaker, koom tes nrog kev tiv thaiv cov yam ntxwv ntawm cov hluav taws xob hluav taws xob thiab cov hluav taws xob qis los tiv thaivcascading trippingthiab nthuav dav qhov txhaum.

 

Kev xaiv ntawm Circuit Breakers

Raws li lawv cov kev tiv thaiv kev ua tau zoo, Circuit Court breakers siv nyob rau hauv lub hwj chim faib tshuab yuav muab faib ua ob pawg:xaivthiabtsis xaiv.

Selective low-voltage circuit breakers suav nrogkev tiv thaiv ob-theemthiabkev tiv thaiv peb-theemNtawm lawv, cov yam ntxwv tam sim no thiab cov yam ntxwv ncua sij hawm luv luv yog siv rau luv luv-circuit tripping, thaum tus yam ntxwv ncua sij hawm ntev yog siv rau kev tiv thaiv overload.

Cov kab hluav taws xob tsis raug xaiv feem ntau ua haujlwm tam sim ntawd thiab tsuas yog siv rau kev tiv thaiv luv luv.Qee lub sijhawm ua haujlwm qeeb thiab tsuas yog siv rau kev tiv thaiv overload.

Nyob rau hauv ib lub hwj chim faib system, yog hais tias tusupstream Circuit Court breakeryog xaiv thiab covdownstream Circuit Court breakeryog tsis xaiv los yog xaiv, xaiv xaiv tsuas yog ua tiav los ntawm kev siv lub sij hawm ncua sij hawm ncua sij hawm luv luv los yog ncua sij hawm sib txawv.

Thaum siv lub sij hawm ncua ntawm qhov hluav taws xob hluav taws xob hluav taws xob, kev saib xyuas yuav tsum tau them rau cov ntsiab lus hauv qab no:

⑴Txawm hais tias tus downstream breaker yog xaiv los yog tsis xaiv, qhov kev teeb tsa tam sim no ntawm qhov tam sim no tshaj tawm tam sim no ntawm cov dej ntws tawm feem ntau yuav tsum tsis pub tsawg dua.1.1x uaqhov siab tshaj plaws peb-theem luv-circuit tam sim no ntawm lub davhlau ya nyob twg tawm ntawm lub downstream breaker.

⑵ Yog hais tias tus downstream breaker tsis yog xaiv, los tiv thaiv lub upstream luv-lub sij hawm ncua sij hawm dhau-tam sim no tso tawm los ntawm kev khiav hauj lwm ua ntej vim tsis txaus instantaneous tripping rhiab heev ntawm downstream breaker thaum lub sij hawm luv luv Circuit Court nyob rau hauv nws tiv thaiv Circuit Court (uas yuav poob selectivity), qhov teeb meem tam sim no ntawm lub upstream short-time ncua sij hawm tshaj tawm tam sim no feem ntau yuav tsum tsis txhob tsawg tshaj li.1,2x uauas ntawm downstream instantaneous tshaj tawm tam sim no.

⑶ Yog hais tias tus downstream breaker tseem xaiv, kom ntseeg tau tias kev xaiv, lub sij hawm luv luv ua hauj lwm lub sij hawm ntawm lub upstream breaker yuav tsum yog tsawg kawg.0.1 s mastshaj li ntawm tus downstream breaker.

Feem ntau hais lus, txhawm rau ua kom muaj kev xaiv ua haujlwm ntawm ob theem ntawm cov hluav taws xob qis qis, cov hluav taws xob sab saud yuav tsum tau nruab nrog lub sijhawm luv luv tshaj tawm tam sim no, thiab nws cov haujlwm tam sim no yuav tsum yog tsawg kawg ib theem siab dua li ntawm downstream breaker. Tsawg kawg qhov kev khiav hauj lwm tam sim no ntawm upstream breaker Iop.1 yuav tsum tsis txhob tsawg dua.1,2x uakev khiav hauj lwm tam sim no ntawm downstream breaker Iop.2​​, piv txwv li: Iop.1 ​​Ntau dua los yog sib npaug rau 1.2Iop.2​​

 

Cascade kev tiv thaiv ntawm Circuit Breakers

Hauv kev tsim hluav taws xob faib hluav taws xob, kev xaiv kev sib koom ua ke ntawm cov hluav taws xob hluav taws xob sab saud thiab qis qis yuav tsum ua kom tau raws li qhov xav tau ntawm kev xaiv, ceev thiab rhiab heev.

Kev xaiv muaj feem xyuam nrog kev sib koom ua ke ntawm cov hluav taws xob hluav taws xob thiab cov hluav taws xob qis, thaum ceev thiab rhiab heev cuam tshuam nrog cov yam ntxwv ntawm cov cuab yeej tiv thaiv nws tus kheej thiab hom kev ua haujlwm ntawm lub voj voog raws li.

Kev sib koom tes kom zoo ntawm cov hluav taws xob hluav taws xob thiab cov hluav taws xob hauv hluav taws xob tuaj yeem xaiv qhov tsis raug ntawm Circuit Court, kom ntseeg tau tias lwm cov kab hluav taws xob noj qab haus huv hauv cov khoom siv hluav taws xob txuas ntxiv ua haujlwm zoo li qub.On qhov tsis sib xws, nws yuav cuam tshuam rau kev ntseeg siab ntawm kev faib khoom.

Kev tiv thaiv Cascade yog ib daim ntawv thov tshwj xeeb ntawm tam sim no - txwv cov yam ntxwv ntawm cov hluav taws xob hluav taws xob.Nws lub hauv paus ntsiab lus yog siv tam sim no - txwv qhov cuam tshuam ntawm cov hluav taws xob hluav taws xob hluav taws xob, kom cov hluav taws xob hluav taws xob qis dua tuaj yeem raug xaiv rau cov hluav taws xob qis, thiaj li txo tus nqi thiab txuag nqi.

Cov dej ntws tawm tam sim no - txwv Circuit Court breaker QF1 muaj peev xwm ua txhaum lub siab tshaj plaws yav tom ntej luv luv -circuit tam sim no ntawm nws qhov chaw teeb tsa.Txij li cov kab hluav taws xob sab saud thiab qis hauv cov kab hluav taws xob tau teeb tsa hauv cov kab ke, thaum lub qhov hluav taws xob luv luv tshwm sim ntawm qhov hluav taws xob ntawm qhov hluav taws xob downstream QF2, qhov tseeb luv luv - luv dua {6} tam sim no luv dua ntawm qhov chaw ntawd vim yog tam sim no - txwv cov nyhuv QF1.

Hauv lwm lo lus, lub peev xwm tawg ntawm lub downstream breaker QF2 tau txhim kho zoo heev nrog kev pab ntawm QF1, tshaj nws cov peev txheej tawg.

Qhov kev tiv thaiv cascade no kuj muaj qee yam kev mob.Piv txwv li, cov kab hluav taws xob uas nyob ib sab yuav tsum tsis txhob nqa cov khoom tseem ceeb (vim ib zaug QF1 mus ncig ua si, QF3 Circuit Court kuj tseem poob zog). Tib lub sijhawm, qhov teeb tsa tam sim ntawm QF1 yuav tsum phim nrog QF2.

Cascade cov ntaub ntawv tsuas yog txiav txim siab los ntawm kev ntsuam xyuas, thiab kev sib koom tes thiab kev xaiv ntawm cov kab hluav taws xob sab saud thiab qis qis tuaj yeem lees paub thiab muab los ntawm cov chaw tsim khoom hluav taws xob hluav taws xob.

 

rhiab heev ntawm Circuit Breakers

Txhawm rau kom ntseeg tau tias qhov tam sim no lossis luv luv - lub sijhawm ncua sijhawm dhau - tam sim no tso tawm ntawm lub tshuab hluav taws xob tam sim no tuaj yeem ua haujlwm tau ntseeg tau raws li qhov tsawg kawg nkaus kev ua haujlwm ntawm lub kaw lus thaum lub sijhawm luv luv - Circuit Court txhaum tshwm sim nyob rau hauv nws qhov kev tiv thaiv ntau yam, kev tiv thaiv rhiab heev ntawm Circuit Court breaker yuav tsum ua kom tau raws li qhov yuav tsum tau muaj nyob rau hauvCode for Design of Low-Voltage Fais Fab Distribution(GB 50054-95).

Qhov rhiab heev yuav tsum tsis pub tsawg tshaj 1.3, uas yog:Sp =Ik.min​/Iop​ Ntau tshaj los yog sib npaug rau 1.3

Qhov twg:

Iop​=Kev khiav hauj lwm tam sim no ntawm qhov tam sim no lossis luv luv - lub sij hawm ncua dhau - tawm tam sim no

Ik.min​=Ib zaug-theem lossis ob-theem luv-circuit tam sim no ntawm qhov kawg ntawm kab tiv thaiv nyob rau hauv qhov tsawg kawg nkaus kev khiav hauj lwm hom ntawm lub system

Sp​=rhiab heev ntawm Circuit Court breaker

Kev saib xyuas kuj tseem yuav raug them rau kev txheeb xyuas qhov tseeb thaum lub sij hawm xaiv Circuit Court breaker.Rau cov kev xaiv Circuit Court breakers nruab nrog ob qho tib si luv - lub sij hawm ncua thiab instantaneous tshaj - tawm tam sim no, tsuas yog kev khiav hauj lwm rhiab heev ntawm luv luv - lub sij hawm ncua dhau - tam sim no tso tawm yuav tsum tau xyuas; kev txheeb xyuas qhov tam sim no dhau - tsis tas yuav tso tawm tam sim no.

 

Kev xaiv thiab teeb tsa ntawm Circuit Breaker tso tawm

(1) Kev teeb tsa kev khiav hauj lwm tam sim no rau Instantaneous Over-tam sim no tso tawm

Ntawm cov cuab yeej tiv thaiv los ntawm Circuit Court breaker, qee cov cuab yeej hluav taws xob yuav tsim cov khoom siv hluav taws xob ntau zaus lawv cov ntsuas tam sim no nyob rau lub sijhawm luv luv thaum pib, uas ua rau lub Circuit Court breaker dais loj ncov tam sim no nyob rau hauv lub sij hawm luv luv.

Kev khiav hauj lwm tam sim no Iop(o) ​​ntawm qhov tam sim no tshaj tawm tam sim no yuav tsum tshaj qhov siab tshaj plaws tam sim no Ipk ntawm lub Circuit Court, uas yog: Iop(o) ​​Ntau dua los yog sib npaug rau Krel ⋅Ipk Qhov twg Krel yog qhov kev ntseeg tau coefficient.

Thaum xaiv Circuit Court breaker, xyuas kom meej tias qhov teeb tsa tam sim no ntawm qhov tam sim no tshaj tawm tam sim no tshaj qhov siab tshaj tam sim no kom tsis txhob plam qhov tsis xav tau.

(2) Kev teeb tsa kev khiav hauj lwm tam sim no thiab lub sij hawm luv luv ncua sij hawm tshaj tawm tam sim no

Kev khiav hauj lwm tam sim no Iop(s) ntawm qhov ncua sij hawm ncua sij hawm tshaj tawm tam sim no kuj tseem yuav dhau qhov siab tshaj tam sim no Ipk ntawm lub voj voog, xws li: Iop(s) ​​Ntau dua lossis sib npaug rau Krel ⋅Ipk ​​Qhov twg Krel yog qhov kev ntseeg tau coefficient.

Lub sijhawm ua haujlwm ntawm kev ncua sijhawm luv luv yog feem ntau muab qhab nia raws li 0.2 s, 0.4 s thiab 0.6 s.Nws yuav tsum tau txiav txim siab raws li kev xaiv kev sib koom ua ke ntawm cov khoom siv tiv thaiv sab saud thiab qis qis.Lub sijhawm ua haujlwm ntawm kev tiv thaiv sab saud yuav tsum yog ib lub sijhawm ntev dua li ntawm kev tiv thaiv qis.

(3) Kev teeb tsa kev khiav hauj lwm tam sim no thiab lub sij hawm rau ncua sij hawm ncua sij hawm tshaj tawm tam sim no

Kev ncua sij hawm ntev tshaj li tam sim no yog siv los tiv thaiv overload.Yog li ntawd, nws qhov kev khiav hauj lwm tam sim no Iop(l) ​​ tsuas yog xav tau tshaj qhov siab tshaj plaws load tam sim no (xws li tam sim no I30​​) ntawm Circuit Court: Iop(l) ​​Ntau dua los yog sib npaug rau Krel ⋅I30 ​​Krel yog qhov kev ntseeg tau coefficient.

Lub sijhawm ua haujlwm ntawm qhov ncua sij hawm ncua ntev yuav tsum tshaj lub sijhawm ntawm kev tso cai luv luv-lub sij hawm dhau los kom tsis txhob plam qhov tsis xav tau ntawm lub Circuit Court breaker.

(4) Kev sib koom ua ke ntawm kev khiav hauj lwm tam sim no ntawm Kev Tshaj Tawm Tshaj Tawm thiab Tiv Thaiv Cable

Txhawm rau tiv thaiv kev kub hnyiab, kev puas tsuaj los yog hluav taws kub los ntawm overload lossis luv luv Circuit Court yam tsis muaj tripping, kev khiav hauj lwm tam sim no Iop ntawm tshaj tawm tam sim no yuav tsum tau raws li: Iop ​​Less dua los yog sib npaug rau Kol ⋅Ial qhov twg:

Ial= tso cai tam sim no-nqa peev ntawm insulated cable

Kol​=tso cai luv luv-lub sij hawm overload yam ntawm insulated cable

Tus nqi ntawm Kol:

Rau instantaneous thiab luv-lub sij hawm ncua kev tso tawm: 4.5

Rau ncua sij hawm ncua ntev siv los tiv thaiv luv luv: 1.1

Rau ncua sij hawm ntev tso tawm tsuas yog siv los tiv thaiv overload: 1

Yog tias qhov kev sib koom ua ke saum toj no tsis tau ua tiav, kho qhov kev tso tawm tam sim no, lossis nce qhov chaw hla ntawm tus neeg xyuas pib lossis cable kom haum.