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Requirements for liquid, gas, and solid insulation; earthing; and mechanical robustness.

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The shift from the IEC 60044 series to IEC 61869 was largely driven by the introduction of (electronic transformers). IEC 61869-1 provides the framework that allows both traditional inductive transformers and modern digital sensors to be specified and tested under a unified standard, facilitating easier integration into modern Smart Grid infrastructures.

While is a copyrighted standard and typically requires a purchase for the full text, you can legally access previews and summaries to understand its core requirements. Where to Legally Access IEC 61869-1

IEC 61869-1 is a standard that replaces the older IEC 60044 series. It focuses on instrument transformers used for measuring and protective purposes in electrical power systems. The standard outlines the requirements for the design, construction, and testing of instrument transformers, ensuring their accuracy, reliability, and safety.

The table of contents, the full scope, normative references, and often the first few pages of definitions.