It merges the requirements for general instrument transformers and low-power instrument transformers (LPITs) into a single document.

Standardizes highest equipment voltage, insulation levels, and accuracy classes to ensure interoperability.

The standard, titled "Instrument Transformers – Part 1: General Requirements," serves as the foundational "product-family" document for the entire IEC 61869 series. It establishes the core technical and safety specifications that apply to all types of newly manufactured instrument transformers, ensuring they provide accurate signals for measurement, protection, and control in high-voltage (HV) electrical systems. Scope and Applicability

: Defines limits of error for both analogue and digital secondary signals to ensure precise metering and protection.

To purchase the official IEC 61869-1 standard, here's an option.