At present

the type of transformers which are in operation used in an early 220 kV smart substation is electronic transformer. This type of electronic transformer and its supporting secondary equipment are intelligent equipment produced in the early stage of technological immaturity. The device itself has defects. In addition

it has been in operation for many years

and its working conditions can not meet the requirements of stable operation

which lays hidden dangers for the safe operation of regional power grid. It is urgent to carry out the commissioning

rectification and transformation of electronic transformer and its supporting equipment of the whole station. Aiming at the preliminary preparation of transformation and the key technical problems in the transformation process

solutions and thinking summary are put forward in order to improve the safety

feasibility and technology in the transformation process of smart substation.