Kev paub ntawm Fuses.
Tus ntsuas tam sim no ntawm lub fuse yog tib yam li tam sim no qhov ntsuas ntawm lub yaj? Nws' s tsis. Cov ntsuas tam sim no ntawm cov fuse yog qhov tseem ceeb tshaj tawm tam sim no ntawm lub fuse.
Nws yog txiav txim siab los ntawm kev pom zoo kub nce ntxiv ntawm txhua qhov ntawm lub fuse thaum lub sijhawm ua haujlwm ntev. Cov movies tam sim no ntawm lub yaj yog txiav txim siab los ntawm nws qhov tsawg kawg melting tam sim no, thiab tuaj yeem muab faib ua qib zoo raws li qhov xav tau.
Feem ntau, fuse-txuas nrog cov qib ntsuas tam sim no tuaj yeem nruab nrog tus lej ntawm cov melts nrog cov qib siab tam sim no, tab sis cov rated tam sim no ntawm yaj yuav tsum tsis pub tshaj tam sim no ntawm cov fuse-txuas nrog uas nws tau sib phim.
Dab tsi yog qhov tseem ceeb ntawm lub fuse Lub ntsiab tsis tseem ceeb ntawm cov fuse yog:
(1) Qhov hluav taws xob uas ntsuas cov roj teeb fuse tuaj yeem tiv taus thaum ua haujlwm ntev thiab tom qab nws tawg, thiab nws tus nqi feem ntau sib npaug los yog ntau dua qhov hluav taws xob.Qhov rated voltage ntawm cov khoom siv roj.
(2) Qhov tam sim no uas qhov fted tam sim no fuse tuaj yeem dhau mus ntev ntev yog nyob ntawm cov kev tso cai kub nce ntxiv ntawm txhua ntu ntawm fuse ntev.
(3) Qhov kawg tawg peev xwm.Qhov fuse tuaj yeem ntseeg siab tawg qhov hluav taws xob luv luv tam sim no nyob rau hauv kev ua txhaum. Nws yog ib qho ntawm cov tseem ceeb qhia kev ntawm fuse.
(4) Pre-arc tam sim no-sijhawm ua cim.
(5) I2t cov yam ntxwv thaum lub rhuav tshem tam sim no loj heev, nws yog qhov txaus los ntawm qhov kev ua haujlwm ntawm lub fuse nrog cov cim ua ntej-tam sim no-lub sijhawm, vim hais tias lub sijhawm no lub sijhawm arcing tsis tuaj yeem tsis quav ntsej nyob rau lub sijhawm fusing tag nrho. Vim tias nyob rau lub sijhawm no. Qhov tam sim no tau tawg rau hauv 20ms lossis tsawg dua. Yog tias cov txiaj ntsig zoo ntawm sine yoj raug siv los qhia nws, nws tsis tsim nyog los soj ntsuam nws cov nyhuv thermal. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum sib sau (∫t0 idt) los sawv cev cov nyhuv thermal, uas yog tus yam ntxwv I2t. Feem ntau, kev tiv thaiv kev ua haujlwm ntawm lub fuse yog tus cwj pwm ntawm I2t thaum lub sijhawm fusing tsawg dua 0.1s; thaum lub sijhawm fusing ntau dua li ntawm 0.1s, nws yog tus cwj pwm los ntawm pre-arc tam sim no-lub sijhawm.
(6) Thaum lub overvoltage fuse tawg Circuit Court, nws tshwm sim los ntawm qhov tsis nkag ntawm cov kab, uas tshaj qhov ntsuas qhov ntsuas ntawm cov kab ob peb zaug. Kev tsim hluav taws xob rau tus kheej, nws yuav tsis tsuas yog cuam tshuam rau cov txheej txheem tua hluav taws, tab sis kuj ua kev puas tsuaj rau rwb thaiv tsev ntawm kab thiab khoom siv hluav taws xob. Rau lub fuse nrog tam sim no limiting muaj nuj nqi, lub overvoltage yog siab heev.
Kev saib xyuas tshwj xeeb yuav tsum tau them. Dab tsi yog qhov tiv thaiv cov yam ntxwv ntawm lub fuse? Cov yam ntxwv tiv thaiv ntawm kev fuse kuj tuaj yeem raug hu ua melting yam ntxwv, nws yog tus yam ntxwv tseem ceeb ntawm fuse. Cov yam ntxwv ntawm melting yam ntxwv los ntawm yaj
Cov kev sib raug zoo ntawm qhov tam sim no thiab lub sijhawm melting ntawm yaj, uas yog tib yam li kev tiv thaiv cov yam ntxwv ntawm lub thermal relay, yog lub sijhawm rov qab. Muaj cov fuse tam sim no thiab tsis txuas nyob rau hauv kev tiv thaiv cov yam ntxwv ntawm fuse
Muab cov kab sib cais ntawm cov ntws tawm, thiab txoj kab sib txuam yog qhov tsawg tshaj plaws melting tam sim no IR. Nws yog xws li tus nqi tam sim no, thaum qhov tam sim no los ntawm yaj yog qhov sib npaug rau nws, lub yaj yaj yog ntawm tus nqi tam sim no
Nws yuav tsum tsis txhob fused, yog li IR> Qhov sib piv ntawm qhov tsawg kawg nkaus melting mus rau tam sim no ntawm cov roj yaj yog hu ua melting coefficient β, uas sawv cev rau kev nkag siab ntawm fuse tiv thaiv thaum ntau me me ntawm ntau dhau
Performance index ntawm. Txij li qhov pom ntawm kev tiv thaiv kev tiv thaiv overload, β yog me me, uas muaj txiaj ntsig me me ntau dhau los. Piv txwv li, los ntawm qhov pom ntawm ntau tshaj kev tiv thaiv ntawm cov xaim hluav taws xob thiab lub cev muaj zog, tus nqi ntawm β yuav tsum nyob nruab nrab ntawm 1.2 thiab 1.4.
Yog tias tus nqi ntawm β tseem me npaum li ze rau 1, tsis tsuas yog ua haujlwm kub ntawm cov yaj hauv e Ie dhau lawm, tab sis kuj tseem ua yuam kev ntawm ampere-thib ob tus yam ntxwv nws tus kheej tuaj yeem ua rau yaj hauv Ie.
Qhov tshwm sim ntawm fusing, uas cuam tshuam qhov kev cia siab ntawm lub fuse. Cov nplaig yaj melting yog tsuas yog txiav txim siab los ntawm cov khoom siv thiab ua haujlwm kub ntawm yaj thiab nws cov qauv. Qhov zoo ntawm qhov fuse
Lub sij hawm yog qhov muab suav lub sijhawm thiab lub sijhawm sib txuas. Nyob rau hauv cov ntaub ntawv ntawm ntau ntau dhau los, lub sijhawm fusing yog nyob ze rau lub sijhawm melting, thiab lub sijhawm arcing yog feem ntau negligible, yog li cov melting yam ntxwv kuj
Nws yog lub cim ua ntej-tam sim no-lub sijhawm ntawm lub fuse. Nws yuav tsum tau taw qhia tias vim yog kev hloov pauv ntawm cov khoom sib xyaw cov khoom yaj, qhov sib txawv ntawm cov yaj me thiab qhov hloov pauv ntawm nws cov xeev thiab cov huab cua txias
Vim tias qhov tsis zoo ntawm lub fuse thiab qhov hloov ntawm qhov nruab nrab kub nruab nrab, lub sijhawm fusing kuj hloov pauv, yog li kev tiv thaiv nkhaus ntawm lub fuse tsis ruaj khov, tsim ib qho 10-20%
Ib pab pawg ntawm qhov yuam kev. Nyob rau hauv txoj kev no, nws yog qhov ua tau kom fuse hauv qab Ie, tab sis tsis fuse thaum sib txuam me me ntawm ntau dhau. Thaum txhim kho thiab siv lub fuse, nws yuav tsum muaj qhov txaus
Sau cia qhov no.
DISSMANN lub tsheb fuse fuse lub tsheb fuse yas fuse kev ua haujlwm ruaj khov yog tsom, lub siab fuse, lub tsheb fuse, lub tsheb fuse nrog, fuse thiab lwm yam kev tiv thaiv,
Cov khoom lag luam tau txais UL, CSA, TUV, ASTA, CE, CQC thiab lwm yam ntawv pov thawj
Dab tsi yog txheej txheem fuse? Cov txheej txheem ntawm lub fuse yog ntxaib muab faib ua plaub theem: (1) Lub suab ntawm lub fuse yog tshwm sim los ntawm overload tam sim no
Los yog thaum tshav kub kub vim muaj luv luv-tam sim no, thiab nws qhov kub nce mus rau lub ntsiab lus yaj ntawm cov khoom yaj, tab sis nws tseem nyob hauv lub xeev khov kho thiab tseem tsis tau pib yaj. (2) Ib feem ntawm cov hlau ua kom yaj
Txhawm rau hloov pauv mus rau lub xeev ua kua, thaum lub sijhawm no, vim tias cov yaj yaj yaj kom nqus tau ib feem ntawm cov cua sov (tshav kub ntawm kev sib xyaw), lub siab kub yog ib txwm tiv thaiv raws li lub ntsiab lus melting. (3) molten hlau txuas ntxiv
Nws yog rhuab kom txog thaum nws qhov kub nce mus rau qhov chaw vaporization, uas yog theem ua cua sov thib ob. (4) Cov pob zeb yaj sib tsoo, qhov sib txawv tshwm, thiab lub arc yog tsim vim qhov sib txawv uas tau tawg.
Txog thaum arc yog extinguished. Plaub theem saum toj no yog ob qho txheej txheem txuas ntxiv: txheej txheem pre-arc ua ntej arc tsim tawm (nws suav nrog qhov tau hais ua ntej rau peb peb
Phase); cov txheej txheem arc tom qab arc tau tshwm sim. Cov yeeb yam tseem ceeb ntawm cov txheej txheem ua ntej arc yog qhov cua sov thiab yaj ntawm yaj, hauv lwm cov lus, cov fuse hauv cov txheej txheem
Lub luag haujlwm yog xav kom ua tiav rau qhov ua tsis tiav. Pom tseeb, qhov loj dua qhov ntau ntawm ntau dhau ntawm qhov sib piv tam sim no txheeb ze rau qhov muaj qhov ntsuas tam sim no, qhov nrawm kub tau nce thiab luv dua cov txheej txheem ua ntej arc; ntawm qhov tsis sib xws, ua ntau dhau
Qhov me dua qhov tam sim no ntau, ntev dua qhov ua ntej ua ntej arc. Lub ntsiab tseem ceeb ntawm cov txheej txheem arc yog tias arc muaj ntau ntawm cov hlau vuas kis tau thiab hlawv rau hauv qhov sib txawv, thiab ua rau lub zog electromotive.
Nws txav hauv qis dua nruab nrab thiab txias los ntawm nruab nrab. Thaum kawg, arc qhov sib txawv nce thiab arc lub zog yog nqus thiab tsis tuaj yeem txuas ntxiv mus hlawv, thiab thaum kawg extinguishes. Lub sijhawm ua ntawm cov txheej txheem no
Kev txiav txim siab los ntawm qhov ua tau zoo arc extinguishing muaj peev xwm ntawm fuse. Dab tsi yog tag nrho ntau yam tawg thiab ib feem ntau tawg fuse? Daim ntawv qhia txog cov kab hluav taws xob tag nrho txhais tau tias pib ntawm qhov tsawg kawg melting tam sim no,
Lub fuse muaj peev xwm ua txhaum ntawm tsoo tawg nyob rau tam sim no. Qhov ntau tawg tawg fuse yog hais txog qhov teev tsawg kawg tawg tam sim no (los yog siab tshaj plaws tawg lub sij hawm) kom nyob rated
Lub fuse uas tawg nruab nrab ntawm cov khoom tam sim no, xws li fuse rau kev tiv thaiv semiconductor li, yog ib qho ntawm lawv.