Understanding IEC 61869-1: The Foundation of Modern Instrument Transformers
Using the PDF Effectively
Key Components:
2. Scope and Purpose
- Instrument transformer (IT): Device that reproduces voltage or current at a reduced, standardized level for meters, protection relays, and measuring instruments.
- Accuracy classes: Classification of performance for measurement or protection (e.g., meter classes, protection classes). Defines limits for ratio and phase error under specified conditions.
- Rated quantities: Rated primary/secondary currents or voltages, rated frequency, rated burden (VA), rated insulation levels, thermal and short-time current ratings.
