: The standard defines various accuracy classes for current transformers, specifying the maximum allowable errors in terms of ratio and phase angle for each class. Common classes include 0.1, 0.2, 0.5, 1, and 3.

These offer extended accuracy down to 1% of the rated current, making them ideal for variable load applications.

Report prepared for technical and compliance use. Always refer to the official standard text for full legal and design requirements.

The EN 61869-2 standard offers several benefits to users and manufacturers of current transformers:

| Standard | Role | |----------|------| | | General requirements (common to all instrument transformers) | | EN 61869-2 | Specific to current transformers (inductive type) | | EN 61869-6 | Low-power instrument transformers (LPITs) – often replaces conventional CTs for digital substations | | EN 61869-9 | Digital interfaces for instrument transformers | | EN 60044-1 (withdrawn) | Superseded by EN 61869-2 (but still referenced for old designs) |