| Type | Application | Accuracy classes (examples) | Notes | |------|-------------|----------------------------|-------| | | Billing, panel meters | 0.1, 0.2, 0.5, 1, 3 | Low phase error, high accuracy at normal load. | | Protection CTs | Relay inputs, fault detection | 5P, 10P (also PX/TPX/TPY/TPZ for special cases) | High accuracy under fault currents. | | Dual-purpose CTs | Both measurement & protection | e.g., 0.5/5P | Two cores or composite class rating. |
1. Document Identification & Scope Standard: EN 61869-2 Title: Instrument transformers – Part 2: Additional requirements for current transformers Based on: IEC 61869-2 (Edition 1.0, 2012-10) Supersedes: EN 60044-1 (former standard for inductive current transformers) en 61869-2
Always specify CTs by referencing EN 61869-2 including accuracy class, rated burden, ALF (for protection), and FS (for metering). Avoid relying on superseded 60044-1 standards for new equipment. Report prepared for technical and compliance use. Always refer to the official standard text for full legal and design requirements. | Type | Application | Accuracy classes (examples)
| Type | Application | Accuracy classes (examples) | Notes | |------|-------------|----------------------------|-------| | | Billing, panel meters | 0.1, 0.2, 0.5, 1, 3 | Low phase error, high accuracy at normal load. | | Protection CTs | Relay inputs, fault detection | 5P, 10P (also PX/TPX/TPY/TPZ for special cases) | High accuracy under fault currents. | | Dual-purpose CTs | Both measurement & protection | e.g., 0.5/5P | Two cores or composite class rating. |
1. Document Identification & Scope Standard: EN 61869-2 Title: Instrument transformers – Part 2: Additional requirements for current transformers Based on: IEC 61869-2 (Edition 1.0, 2012-10) Supersedes: EN 60044-1 (former standard for inductive current transformers)
Always specify CTs by referencing EN 61869-2 including accuracy class, rated burden, ALF (for protection), and FS (for metering). Avoid relying on superseded 60044-1 standards for new equipment. Report prepared for technical and compliance use. Always refer to the official standard text for full legal and design requirements.
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