Smart grid is a modernized electrical grid that uses new technologies, equipment and controls to respond digitally and immediately to new electrical demand. The smart grid is a combination of power, communication and information infrastructures. Along with developments in power infrastructure, some new challenges will be emerged in IT infrastructure of smart grid. Electric power distribution network is one of the most important and widest domains of the smart grid which allows for two-way communication between the utility and customers. Distribution automation and IT solutions for active network management provide the foundation for the overall target of smart grid.