I notice you mentioned (likely a typo for 61936-1 ), which is an international standard: “Power installations exceeding 1 kV AC and 1.5 kV DC – Part 1: AC” from the IEC.
IEC 61936-1:2021 is the cornerstone international standard governing the design and erection of AC electrical power installations with nominal voltages exceeding 1 kV. This paper analyzes the technical framework provided by the standard, focusing on its updated safety philosophies, insulation coordination requirements, and structural design criteria. It explores how the 2021 revision modernizes guidelines for substations and switchgear to accommodate evolving grid technologies, including the integration of renewable energy sources and digital monitoring systems. iec 6193612021 link