Mhlawumbi wonke umntu uqhelene neemitha zamandla ombane. Kule mihla, iimitha ezikrelekrele zihlala zisetyenziselwa ukulinganisa nokuhlawulisa umbane wasekhaya. Ukuba ujonga kakuhle, uya kufumanisa ukuba kukho iparameter 5 (60) ebhalwe kwindawo ecacileyo yemitha yamandla ombane.

Umzekelo, ipharamitha ekwisangqa esibomvu kumfanekiso ongentla: 5 (60) A. Xa sijonga iyunithi, siyazi ukuba ibhalwe njenge-current, ngoko ke yintoni ubudlelwane phakathi kwale mijelo mibini? Kwenzeka ntoni xa i-current idlulile? Masithethe ngento ebhekiselwa kuyo le mijelo mibini ngokwezibiyeli zangaphandle (5) nangaphakathi kwezibiyeli (60).
I-current kwiibrakethi
Umbane okwizibiyeli – 60A kumzekelo, ubhekisa kumbane ophezulu olinganisiweyo wemitha yamandla. Ngokungafaniyo nezinye izixhobo, umbane olinganisiweyo wemitha yamandla ombane uchatshazelwa kakhulu zizinto ezingqongileyo, ngoko ke umda othile uhlala ushiyeka xa uphuma kwifektri – umbane ophezulu olinganisiweyo yi-120% yombane ophawulweyo. Ke ngoko, ukuba inani elikwizibiyeli liyi-60, umbane ophezulu olinganisiweyo yi-72A – ukuba ayingommandla onzima kakhulu, impembelelo kumbane ophezulu olinganisiweyo ngokubanzi ayizukufikelela kwi-20%. Ke ngoko, umbane ophezulu olinganisiweyo wemitha ophawulwe nge-60A ngokubanzi umalunga ne-66A ekusetyenzisweni ngokwenene.
Kwenzeka ntoni xa eli xabiso lidluliwe? Impendulo kukulinganisa okungachanekanga - mhlawumbi ngaphezulu, mhlawumbi ngaphantsi.
Izibiyeli zangaphandle zangoku
I-5 engaphandle kwezibiyeli apha ibizwa ngokuba yi-basic current, ekwabizwa ngokuba yi-calibration current. Imiselwa yi-starting current ye-electric energy meter – ixabiso elincinci langoku elivumela i-electric meter ukuba ijikeleze rhoqo kwaye ilinganise ngokuqhubekayo. I-starting current ye-general smart meter yi-0.4% yamandla alinganisiweyo. Oko kukuthi, i-meter ene-rated current ye-5A iya kutshajwa logama nje i-current kwisekethe ifikelela kwi-0.02A xa isetyenziswa. Kuya kubakho umlinganiselo phakathi kwe-rated current kunye ne-high rated current, efana ne-5 (60) A, ebudlelwane obuphindwe kane. Olu mlinganiselo lubizwa ngokuba "bububanzi bomthwalo". Ngokubanzi, kukho amaxesha ama-2, amaxesha ama-4, amaxesha ama-6, amaxesha asibhozo okanye nangaphezulu kwamaxesha alishumi – okukhona ububanzi bomthwalo bukhulu, kokukhona inqanaba lobugcisa lifuneka liqine, kwaye ixabiso le-meter liya kuba phezulu ngokwemvelo.
Ngoko ke, amanani angaphandle kwezibiyeli awananto yakwenza nokusetyenziswa kokwenyani ngumsebenzisi—ngaphezulu okanye ngaphantsi kweli xabiso aliyi kuchaphazela ukulinganiswa kwemitha. Kukho iinkalo ezimbini ezichaphazeleka kakhulu yi-calibration current: ixabiso lemitha (elinxulumene nobubanzi bomthwalo) kunye ne-starting current (ebalwa yi-calibration current).