Define the phase angle error (θ) in a current transformer instrument, wherein
Im = Magnetizing component of exciting current,
δ = Angle between secondary induced voltage and secondary current
Ic = Core loss component of exciting current
n = turns ratio
Is = Secondary winding current
Ip Primary winding current
1
\(\rm \theta=\frac{Im \ Cos \delta-Ic \ Sin \delta}{nIs} degree\)
2
\(\rm \theta=\frac{Im \ Sin \delta-Ic \ Cos \delta}{nIp} degree\)
3
\(\rm \theta=\frac{Im \ Cos\delta-Ic \ Sin \delta}{nIp} degree\)
4
\(\rm \theta=\frac{Im \ Sin \delta-Ic \ Cos \delta}{nIs} degree\)