Ukukhethwa kwengundoqo ye-transformer kuhambelana ne-voltage, ngelixa ukukhethwa kwe-transformer conductor kuhambelana nangoku, oko kukuthi, ubukhulu be-conductor buhambelana ngqo nokuveliswa kobushushu. Ngamanye amazwi, umthamo we-transformer unxulumene kuphela nesizukulwana sokushisa. Kwi-transformer eyilelweyo, ukuba isebenza kwindawo ene-heat dissipation engafanelekanga, ukuba i-1000KVA, inokusebenza kwi-1250KVA ukuba amandla okutshatyalaliswa kobushushu aphuculwe. Ukongezelela, umthamo oqingqiweyo we-transformer uhambelana nokunyuka kweqondo lokushisa elivumelekileyo. Ngokomzekelo, ukuba i-transformer ye-1000KVA ivumelekile ukuba ibe nokunyuka kweqondo lokushisa kwe-100K, kwaye ukuba ivumelekile ukuba isebenze kwi-120K phantsi kweemeko ezikhethekileyo, amandla ayo angaphezulu kwe-1000KVA. Kwakhona kunokubonwa ukuba ukuba imeko yokutshatyalaliswa kobushushu ye-transformer iphuculwe, amandla ayo okubizwa anganyuswa. Ngokwahlukileyo, kubaguquleli be-frequency kunye nomthamo ofanayo, umthamo wekhabhinethi ye-transformer unokuncitshiswa.