What are the classes for current transformer?
Aug 30,2024
Current transformers (CTs) are classified based on accuracy and performance characteristics, primarily defined by standards such as IEC (International Electrotechnical Commission) and ANSI (American National Standards Institute). The main classes of current transformers include:
These classes reflect the allowable error in ratio and phase shift at specified conditions, with lower class numbers indicating higher accuracy.
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1. Class 0.1:
High-accuracy CTs used for precise measurement applications, typically in calibration labs or high-precision metering.
2. Class 0.2:
Suitable for revenue metering, offering good accuracy for commercial and industrial applications.
3. Class 0.5:
Commonly used for general metering applications, providing a balance between accuracy and cost-effectiveness.
4. Class 1:
Used for energy measurement in less critical applications; acceptable for standard billing but not for high-accuracy requirements.
5. Class 3:
Typically used in protective relaying applications rather than precise metering.
These classes reflect the allowable error in ratio and phase shift at specified conditions, with lower class numbers indicating higher accuracy.
