Indlela yokubala ukulinganisa kwangoku kwentambo?-Inokwahlulwa

Umthamo wangoku wokuthwala we-conductor e-insulated okanye ikhebula ngumbane ophezulu onokuthi uqhube ngokuqhubekayo ngaphandle kokugqithisa izinga lokushisa.Ikwabizwa ngokuba yi-ampacity.

Ngelixa iintambo zisebenza zifumana ilahleko yombane ebonakala njengobushushu kwikhondaktha, ukugquma kunye nawo nawaphi na amanye amalungu esinyithi kulwakhiwo.Ukulinganiswa kwangoku kuya kuxhomekeka kwindlela obu bushushu buchithwa ngayo kwi-cable surface kunye neendawo ezikufutshane.Umlinganiselo wokushisa wekhebula yinto emiselweyo kwisikhundla samanje sokuthwala ikhebula.Umlinganiselo ophezulu wokushisa kwikhebula unqunywe ngokusisiseko yi-insulation material.

Ngokukhetha ubushushu be-ambient njengesiseko sendawo engqongileyo, ukunyuka kweqondo lokushisa okuvumelekileyo kufumaneka apho umlinganiselo ophezulu wekhebula unokubalwa kwindawo ethile.Ukuba ixabiso lokumelana ne-thermal yomgangatho wezinto eziphathekayo kwisakhiwo sekhebula liyaziwa, i-current rated current ingabalwa.

Ifomula yokubala umthamo wangoku wokuthwala yile:

I = ukulinganisa kwangoku okuvumelekileyo

∆Φ = Ukunyuka kobushushu kwi-Conductor (K)

R= Ukutshintshana kwangoku ukumelana nobude beyunithi yomqhubi kubushushu obuninzi bokusebenza (Ω/m)

I-Wd = ilahleko ye-dielectric ngobude beyunithi yokufakelwa okujikeleze umqhubi (W/m)

T1= Ukumelana nobushushu ngobude beyunithi nganye phakathi komqhubi omnye kunye nesheath (K m/W)

T2 = ukuxhathisa kwe-thermal ngobude beyunithi yomandlalo phakathi kwe-sheath kunye nesikrweqe (K m/W)

I-T3 = ukuxhathisa kwe-thermal ngobude beyunithi ye-Sheath yangaphandle yentambo (K m / W)

T4 = ukuxhathisa kwe-thermal ngobude beyunithi phakathi kwendawo yekhebula kunye ne-medium ejikelezileyo (K m / W)

n = inani labaqhubi abaphethe umthwalo kwikhebula (ii-conductor zobukhulu obulinganayo kunye nomthwalo ofanayo)

λ1 = Umlinganiselo welahleko kwi-sheath yensimbi ukuya kwilahleko epheleleyo kubo bonke abaqhubi kuloo ntambo

λ2 = umlinganiselo welahleko kwindawo yokuxhobisa ukuya kwilahleko iyonke kubo bonke abaqhubi baloo ntambo.