Iyi transformer is epoxy resin cased ine yakavharirwa zvachose chimiro uye yakazara insulation. Yakagadzirirwa kushandiswa kuyerwa kwevoltiji, magetsi emagetsi uye relay kuchengetedza mumagetsi sisitimu ine rated frequency 50Hz - 60Hz uye rated voltage 3,6, 10 kV kana pasi. Saizi diki, huremu huremu hunogona kuiswa chero chinzvimbo.