<![CDATA[The protection system in electrical engineering is a crucial component in maintaining electrical reliability. The protection system is a vital component that needs attention. Its utility not only serves as a parameter for the reliability of the electrical system but also as a safeguard for electrical system devices, starting from power suppliers (Power Plants), interconnection networks, transmission networks, to distribution networks. In Indonesia, with the unique dynamics of the domestic market, periodic evaluation of relays becomes important. This study investigates the current status and dominance of relay usage in Indonesia. Using a literature study method, we broadly identify the functions, utilities, and applications of Over Current Relay (OCR), Ground Fault Relay (GFR), Differential Relay, and Reverse Power Relay in Indonesia's electrical system. This literature study outlines several types of relays in Indonesia and their dominant usage in the electrical system, providing insights for readers and institutions using relays in Indonesia's electrical system. The implications of this literature study are to broaden the knowledge of the authors and readers and to encourage continuous innovation. With an understanding of the types of relays in Indonesia's electrical system, strategic steps can be taken to improve the reliability and efficiency of the electrical protection system in Indonesia.]]>
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