Discussion
Consider the following statements about current transformers.
1. The errors are worst at low primary current 2. Turns compensation corrects the ratio error 3. Turns compensation corrects the phase angle error
Answer: B
The exciting current is a larger fraction of a small primary current, so the percentage error is worst there. Removing a secondary turn scales the secondary current and so corrects the ratio, but it cannot rotate it and so leaves the phase angle untouched.
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