What is the function of the CT analyzer?

The CT analyzer (Current Transformer analyzer) is a specialized device used to test and evaluate the performance of current transformers (CTs). Its primary functions include:

1. Ratio Testing

Verifies the turns ratio (primary to secondary current ratio) of the CT to ensure it matches the rated ratio (e.g., 1000:5, 600:1).

2. Polarity Verification

Checks the correct polarity of the CT to ensure proper connection in protection and metering circuits.

3. Excitation (Saturation) Curve Testing

Measures the magnetization curve of the CT to assess its performance under different current levels, ensuring it does not saturate prematurely.

4. Burden Testing

Determines the actual burden (load) on the CT secondary circuit to confirm it is within the rated capacity.

5. Winding Resistance Measurement

Checks the DC resistance of the CT windings to detect faults like shorted turns or poor connections.

6. Accuracy Testing (Metering & Protection Classes)

Validates the accuracy class (e.g., 0.2, 0.5, 5P, 10P) to ensure compliance with standards like IEC 61869, IEEE C57.13.