An electrical substation is an integral part of electricity generation, transmission and distribution system. Electric power may flow through several substations between generating plant and consumer, and voltage is step up or step down according to the requirement using a transformer at several stages. By making use of a smart transformer we can monitor and control an entire substation. In this project automation is done using PLC & SCADA using wireless technologies system. PLC (Programmable Logical Controller) plays crucial role in automation field where many process are automated. On the other hand SCADA (Supervisory Control and Data Acquisition) act as human interfacing medium with machine, where voltage, current and temperature fluctuations are monitored and corrected if necessary.