Makhalidwe a ma fuse

Zinthu zazikulu za fuse

1) Pambuyo poti vuto laphulika, fuse iyenera kusinthidwa.

2) Ntchito yoteteza ndi imodzi, yokhala ndi chizindikiro chimodzi chokha cha nthawi yosinthira nthawi, chomwe chimagwiritsidwa ntchito poteteza zinthu zochulukirapo, ma short circuit ndi ground fault protection.

3) Pamene fuse ya gawo limodzi ichitika, mota ya magawo atatu imabweretsa zotsatirapo zoyipa za kugwira ntchito kwa magawo awiri. Zachidziwikire, fuse yokhala ndi chizindikiro cha alamu ingagwiritsidwe ntchito kubwezera, ndipo fuse ya gawo limodzi ikhoza kusokoneza gawo la magawo atatu.

4) Chida chowongolera kutali sichingatheke, ndipo chiyenera kuphatikizidwa ndi chosinthira cha mpeni wamagetsi ndi chosinthira.

Makhalidwe a Fuse

Ntchito ya fuse imachitika posungunuka kwa kusungunuka. Fuse ili ndi khalidwe lodziwikiratu, lomwe ndi khalidwe la ampere-second. Pa kusungunuka, mphamvu yake yogwirira ntchito ndi nthawi yogwirira ntchito ndi makhalidwe a ampere-second a fuse, omwe amatchedwanso makhalidwe a inverse time delay, ndiko kuti: pamene mphamvu yochulukirachulukira ili yaying'ono, nthawi yosakanikirana imakhala yayitali; pamene mphamvu yochulukirachulukira ili yayikulu, nthawi yosakanikirana imakhala yochepa.

Kuti timvetse makhalidwe a ampere-second, tingathe kuona kuchokera ku lamulo la Joule kuti mu series circuit, R value ya fuse siinasinthe kwenikweni, ndipo calorific value imagwirizana ndi sikweya ya current I, komanso ikugwirizana ndi nthawi yotenthetsera T, ndiko kuti: pamene current ili yayikulu, nthawi yofunikira kuti melting iphulike imakhala yochepa. Pamene current ili yaying'ono, nthawi yofunikira kuti melting iphulike imakhala yayitali, ndipo ngakhale ngati kutentha kuli kochepa kuposa kuchuluka kwa kutentha, kutentha kwa fuse sikudzakwera kufika pa melting point, ndipo fuse sidzaphulike ngakhale. Chifukwa chake, mkati mwa current yochulukirapo, pamene current ibwerera ku normal, fuse sidzaphulike ndipo ikhoza kupitiliza kugwiritsidwa ntchito.

Chifukwa chake, kusungunuka kulikonse kumakhala ndi mphamvu yocheperako yosungunuka. Mogwirizana ndi kutentha kosiyanasiyana, mphamvu yocheperako yosungunuka nayonso ndi yosiyana. Ngakhale kuti mphamvu imakhudzidwa ndi chilengedwe chakunja, imatha kunyalanyazidwa m'njira yothandiza. Kawirikawiri, chiŵerengero cha mphamvu yocheperako yosungunuka ya kusungunuka ndi mphamvu yocheperako yosungunuka ya kusungunuka ndi mphamvu yocheperako yosungunuka. Mphamvu yosungunuka ya kusungunuka komwe kumagwiritsidwa ntchito kwambiri ndi yayikulu kuposa 1.25, kutanthauza kuti kusungunuka komwe kuli ndi mphamvu yocheperako ya 10 amps sikungagwirizane pamene mphamvuyo ili pansi pa 12.5 amps.

Izi zikusonyeza kuti chitetezo cha fuse cha short-circuit ndi chabwino kwambiri, ndipo chitetezo cha overload ndi chapakati. Ngati kuli kofunikira kugwiritsa ntchito poteteza overload, ndikofunikira kufananiza bwino line overload current ndi rated current ya fuse. Mwachitsanzo: 8-amp melt imagwiritsidwa ntchito mu 10-amp circuit poteteza short-circuit ndi overload protection, koma makhalidwe a chitetezo cha overload pakadali pano si abwino.