Iec 61869-2 Current Transformers Guide

: It introduces "S" classes (like 0.2S or 0.5S), which are high-precision versions that remain accurate even when the current drops to very low levels—essential for modern energy billing. Modern Innovations

While much of the core physics remains unchanged, IEC 61869-2 introduces several critical advancements: iec 61869-2 current transformers

IEC 61869-2 applies to newly manufactured inductive current transformers intended for use with electrical measuring instruments and protective relays operating at frequencies between 15 Hz and 100 Hz. It supersedes the older IEC 60044-1, consolidating and refining its requirements. The primary goal of the standard is to define the electrical and mechanical characteristics, accuracy classes, and performance under transient conditions. By doing so, it ensures interoperability between CTs and connected devices (relays, meters) regardless of the manufacturer, while guaranteeing a high level of safety for personnel and equipment. : It introduces "S" classes (like 0

A crucial aspect of the standard is its classification of CTs based on application: The primary goal of the standard is to

: Designed for protection, ensuring the CT doesn't saturate (lose accuracy) when a massive short-circuit current hits the system.