Transformer iyi ndi epoxy resin cased yokhala ndi zotsekedwa kwathunthu komanso kutsekereza kwathunthu. Idapangidwa kuti igwiritse ntchito kuyeza voteji, mphamvu zamagetsi ndi chitetezo chamagetsi mumagetsi ovotera pafupipafupi 50Hz - 60Hz ndi voteji 3,6, 10 kV kapena pansipa. Kukula kochepa, kulemera kopepuka kumatha kukhazikitsidwa pamalo aliwonse.