Cov yam ntxwv ntawm cov fuses

Cov yam ntxwv tseem ceeb ntawm fuse

1) Tom qab qhov txhaum raug tshuab, lub fuse yuav tsum tau hloov.

2) Lub luag haujlwm tiv thaiv yog ib qho, nrog tsuas yog ib qho overcurrent inverse time characteristic, uas yog siv rau overload, luv luv Circuit Court thiab av txhaum tiv thaiv.

3) Thaum lub fuse ib theem tshwm sim, lub cev muaj zog peb theem yuav ua rau muaj qhov tsis zoo ntawm kev ua haujlwm ob theem. Tau kawg, lub fuse nrog lub teeb liab ceeb toom tuaj yeem siv los them rau nws, thiab lub fuse ib theem tuaj yeem txiav lub fuse peb theem.

4) Qhov chaw taws teeb tswj tsis tuaj yeem paub, thiab nws yuav tsum tau ua ke nrog lub riam hluav taws xob hloov thiab hloov.

Cov yam ntxwv ntawm fuse

Qhov kev ua ntawm lub fuse yog ua tiav los ntawm kev yaj ntawm cov yaj. Lub fuse muaj ib qho yam ntxwv pom tseeb heev, uas yog, qhov yam ntxwv ampere-ob. Rau cov yaj, nws cov yam ntxwv ua haujlwm tam sim no thiab lub sijhawm ua haujlwm yog cov yam ntxwv ampere-ob ntawm lub fuse, uas tseem hu ua cov yam ntxwv rov qab ncua sijhawm, uas yog: thaum lub sijhawm overload me me, lub sijhawm fusing ntev; thaum lub sijhawm overload loj, lub sijhawm fusing luv.

Yuav kom nkag siab txog cov yam ntxwv ampere-ob, peb tuaj yeem pom los ntawm Joule txoj cai tias hauv lub voj voog series, tus nqi R ntawm lub fuse yeej tsis hloov pauv, thiab tus nqi calorific yog proportional rau lub square ntawm tam sim no I, thiab proportional rau lub sijhawm cua sov T, uas yog: thaum tam sim no Thaum nws loj dua, lub sijhawm xav tau rau lub yaj kom tawg yog luv dua. Thaum tam sim no me me, lub sijhawm xav tau rau lub yaj kom fuse ntev dua, thiab txawm tias tus nqi ntawm kev sib sau ua ke kub tsawg dua tus nqi ntawm thermal diffusion, qhov kub ntawm lub fuse yuav tsis nce mus rau qhov chaw yaj, thiab lub fuse yuav tsis txawm tawg. Yog li ntawd, nyob rau hauv qee qhov overload tam sim no ntau yam, thaum tam sim no rov qab mus rau qhov qub, lub fuse yuav tsis tawg thiab tuaj yeem txuas ntxiv siv.

Yog li ntawd, txhua lub yaj muaj qhov tsawg kawg nkaus tam sim no yaj. Sib raug rau qhov kub sib txawv, qhov tsawg kawg nkaus tam sim no yaj kuj txawv. Txawm hais tias tam sim no raug cuam tshuam los ntawm ib puag ncig sab nraud, nws tuaj yeem tsis quav ntsej hauv kev siv. Feem ntau, qhov piv ntawm qhov tsawg kawg nkaus tam sim no yaj ntawm cov yaj rau qhov ntsuas tam sim no ntawm cov yaj yog qhov tsawg kawg nkaus melting coefficient. Qhov coefficient yaj ntawm cov yaj feem ntau siv yog ntau dua 1.25, uas yog hais tias, cov yaj nrog qhov ntsuas tam sim no ntawm 10 amps yuav tsis fuse thaum tam sim no qis dua 12.5 amps. .

Los ntawm qhov no, nws tuaj yeem pom tias qhov kev tiv thaiv luv luv ntawm lub fuse zoo heev, thiab qhov kev tiv thaiv overload yog qhov nruab nrab. Yog tias nws tsim nyog siv nws hauv kev tiv thaiv overload, nws yog qhov tsim nyog los ua tib zoo phim cov kab overload tam sim no nrog cov ntsuas tam sim no ntawm lub fuse. Piv txwv li: 8-amp yaj yog siv hauv 10-amp Circuit rau kev tiv thaiv luv luv thiab kev tiv thaiv overload, tab sis cov yam ntxwv tiv thaiv overload tam sim no tsis zoo tagnrho.