In this book Smart grid is emerging power system technologies with ensured reliability, efficiency, security and interoperability. This extensive system has many features on transmission and distribution facing a lot of challenges on the constraints like integrated communication system, advance measuring and sensing system, advance control methods, advance grid components, advance interface and decision support. Development of Distribution Automation Systems in Smart Grid is proposed. The power system has considerable improved nowadays with concept of smart grid with the construction, automation in transmission a well as distribution systems. DAS (Distribution Automation System) occupies the distribution system for automated response with the Demand by optimal utility of resources. It deals with a brief review on the automation system developments and challenges, this incorporates advance technologies, increased reliability, and minimal losses with optimal utility of asses of the assets through integrated system under uniform platform of control termed as ADA (Advance Distribution Automation System) systems. ukryj opis