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To develop large-scale electricity industry continuously, Power systems are requested to be high confidence. And digital & automation-based technology is needed over the length and breadth of power system management. As a result of this, IEC 61850, which is standard for building automation systems, was established for dispersed power. All systems and devices are also required to change into digital and network-based systems. In this paper, we propose the outline how digital substation automation systems develop, and share application cases.