What is the reason for stepping up and stepping down of voltage in a certain transformer? All Questions › Category: Transmission And Distribution System › What is the reason for stepping up and stepping down of voltage in a certain transformer? 0 Vote Up Vote Down Chiranjeevi Noble asked 5 years ago 1 Answers 0 Vote Up Vote Down Chetan Shidling Staff answered 5 years ago It depends on turns. If the secondary side turns is more then primary then the voltage is stepped up and if the primary turn is more then the secondary then the voltage is stepped down.