: Reintroduced specific requirements for Gas-Insulated Switchgear (GIS).
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The 2021 revision aligns better with digital substations. It addresses the installation of non-conventional instrument transformers (NCITs) and electronic current/voltage sensors, which require different physical mounting and shielding considerations compared to traditional oil-paper insulated transformers. The 2021 revision aligns better with digital substations
The IEC 61936-1:2021 standard is useful for: It encompasses a wide range of equipment, including:
The document applies to fixed installations with nominal AC voltages above 1 kV and frequencies up to 60 Hz. It encompasses a wide range of equipment, including: and transformers . Switchgear , converters , and cables . Earthing systems , batteries , and capacitors . Associated protection, control, and auxiliary systems .
Control cables must be physically separated from power cables by a minimum of 0.3 meters or a metallic partition to prevent induced voltages.