Question:
If \( I_p, I_m, I_s \) are magnetising, primary and secondary currents of current transformer, then
approximate phase angle \( \theta \) in degrees between \( I_p \) and reversed \( I_s \) is:
If \( I_p, I_m, I_s \) are magnetising, primary and secondary currents of current transformer, then
approximate phase angle \( \theta \) in degrees between \( I_p \) and reversed \( I_s \) is:
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For CT phase error: Use \( \theta \approx \frac{180}{\pi} \cdot \frac{I_m}{I_s} \) — in degrees.
Updated On: May 23, 2025
- \( \theta = \frac{180}{\pi} \times \left( \frac{I_m}{I_s} \right) \)
- \( \theta = \frac{180}{\pi} \times \left( \frac{I_p}{I_s} \right) \)
- \( \theta = \frac{180}{\pi} \times \left( \frac{I_s}{I_m} \right) \)
- \( \theta = \frac{180}{\pi} \times \left( \frac{I_s}{I_p} \right) \)
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The Correct Option is A
Solution and Explanation
The phase angle error in a current transformer is approximately given by:
\[
\theta = \frac{180}{\pi} \times \frac{I_m}{I_s}
\]
where \( I_m \) is the magnetizing component.
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