Physics · Electrical Measurements
Define the phase angle error (θ) in a current transformer, where I m is the magnetizing component of exciting current, I c is the core loss component of exciting current, δ is the angle between secondary induced voltage and secondary current, n is the turns ratio, and I s is the secondary winding current.
- 1θ ≈ I m cos(δ) - I c sin(δ) n I s rad✓
- 2θ ≈ I m sin(δ) - I c cos(δ) n I p rad
- 3θ ≈ I m cos(δ) - I c sin(δ) n I p rad
- 4θ ≈ I m sin(δ) - I c cos(δ) n I s rad
Correct answer
θ ≈ I m cos(δ) - I c sin(δ) n I s rad
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