HVAC transmission is expanding progressively more importance due to various ideal conditions over HVAC. High voltage AC converter transformer is the essential part which is used in HVAC. Tap adder is an essential bit of any high range transformer for procuring diverse goes extents to get particular volt ranges. Normal non electrical tap adders are commonly used therefore. Non electrical tap adders require unending help when tap adders require visit action. The tap adders in HV-AC transformer are as properties to visit movement of tap adder is required. This prototype model a novel controlled electronic tap adder is proposed for twist less trading and diminished upkeep essentially under constant errands. The basic principle of the electronic tap adder, different techniques and certain arrangement of power electronic tap adders for HVAC transformer surveyed and had a go at using reenactment writing computer programs what's progressively, a low voltage working model. © 2020 Elsevier B.V., All rights reserved.