Iimpawu zeefusi

Iimpawu eziphambili zefuse

1) Emva kokuba impazamo ivuthelwe, ifuse kufuneka itshintshwe.

2) Umsebenzi wokukhusela umnye, unophawu olunye kuphela lwexesha elingaphaya kombane, olusetyenziselwa ukhuseleko lokugqithisa, i-short circuit kunye ne-ground fault.

3) Xa kuvela i-fuse yesigaba esinye, i-motor yesigaba sesithathu iya kubangela iziphumo ezibi zokusebenza kwesigaba sesibini. Kakade ke, i-fuse enesignali ye-alamu ingasetyenziselwa ukulungisa loo nto, kwaye i-fuse yesigaba esinye inokuqhawula i-fuse yesigaba sesithathu.

4) Ulawulo olukude alunakufezekiswa, kwaye kufuneka ludityaniswe neswitshi yombane kunye neswitshi.

Iimpawu zeFuse

Isenzo sefuse siqatshelwa ngokunyibilika kwe-melt. Ifuse inophawu olucacileyo, oko kukuthi, uphawu lwe-ampere-second. Kwi-melt, iimpawu zayo zangoku zokusebenza kunye nexesha lokusebenza ziimpawu ze-ampere-second zefuse, ezikwabizwa ngokuba ziimpawu zokulibaziseka kwexesha elichaseneyo, oko kukuthi: xa i-overload current incinci, ixesha lokudibanisa lide; xa i-overload current inkulu, ixesha lokudibanisa lifutshane.

Ukuze siqonde iimpawu ze-ampere-second, singabona kumthetho kaJoule ukuba kwisekethe yochungechunge, ixabiso le-R le-fuse alitshintshi ngokusisiseko, kwaye ixabiso le-calorific lilingana nesikwere se-current I, kwaye lilingana nexesha lokufudumeza i-T, oko kukuthi: xa i-current ikhulu, ixesha elifunekayo ukuze i-melt ivuthe lifutshane. Xa i-current incinci, ixesha elifunekayo ukuze i-melt ivuthe lide, kwaye nokuba izinga lokuqokelela ubushushu lingaphantsi kwenqanaba lokusasazwa kobushushu, ubushushu be-fuse abuyi kunyuka buye kwinqanaba lokunyibilika, kwaye i-fuse ayisayi kuqhuma. Ke ngoko, ngaphakathi koluhlu oluthile lwamandla ombane ogqithisileyo, xa i-current ibuyela kwisiqhelo, i-fuse ayizukuvuthela kwaye ingaqhubeka nokusetyenziswa.

Ngoko ke, i-melt nganye inomlinganiselo ophantsi wokunyibilika. Ngokuhambelana namaqondo obushushu ahlukeneyo, umthamo ophantsi wokunyibilika nawo wahlukile. Nangona umthamo uchaphazeleka yimeko-bume yangaphandle, unokungahoywa kwiindlela ezisebenzayo. Ngokubanzi, umlinganiselo womlinganiselo ophantsi wokunyibilika komnyibiliko kumnyibiliko olinganiselweyo kumnyibiliko yi-melt coefficient encinci yokunyibilika. I-melt coefficient yomnyibiliko osetyenziswa rhoqo ingaphezulu kwe-1.25, oko kukuthi, i-melt enomlinganiselo olinganiselweyo we-10 amps ayizukudityaniswa xa umthamo ungaphantsi kwe-12.5 amps. .

Kuyabonakala koku ukuba ukusebenza kokhuseleko lwe-fuse kwi-short-circuit kugqwesile, kwaye ukusebenza kokhuseleko lwe-overload kuphakathi. Ukuba kuyimfuneko ngokwenene ukuyisebenzisa ekukhuseleni i-overload, kuyimfuneko ukufanisa ngononophelo i-line overload current kunye ne-rated current ye-fuse. Umzekelo: i-8-amp melt isetyenziswa kwi-10-amp circuit ukukhusela i-short-circuit kunye nokukhusela i-overload, kodwa iimpawu zokukhusela i-overload ngeli xesha azifanelekanga.