Calculation of Current Transformer Accuracy Limit Factor
This PDF describes the calculation of the actual accuracy limit factor Fa for the protection-type P Current Transformer (CT).
First, the calculation of actual burden of the CT including connection wires and protection relay impedance is presented.
Then, two alternative methods for calculating Fa are shown. All calculation principles and equations are illustrated with an example.
The rules presented are general used and apply to protection calculation of SPACOM and RED 500 series protection relays.