One relevant ISO standard for relay protection is ISO 18488:2021, which specifies the requirements and recommendations for the application and integration of protective relays in power systems. ISO (International Organization for Standardization) develops international standards to ensure consistency, safety, and effectiveness in various fields, including relay protection. Relay protection plays a crucial role in electrical power network transmission and distribution systems, safeguarding. The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. The technical content of IEC publications is kept under constant review by the IEC. Please make sure. Relay systems protect high-voltage equipment and transmission lines to ensure safe, stable systems. Although failure of a protective relay system may have severe local or regional impacts, most protective relay systems are not required to operate to prove they are in working order. The new protection relay functional standards are. Long term cost reduction (TCO) for trainings and maintenance by reduce variety of relays A fast and selective arc fault mitigation for air-insulated LV & MV switchgear and Relion protection and control relays and sensor technology protect staff and plant facilities for many years.