what is phase error in current transformer?

Phase error in a current transformer (CT) refers to the discrepancy between the phase angle of the primary current and the phase angle of the secondary current. This error occurs due to the transformer’s characteristics, including its magnetic properties and load conditions. Phase error can affect the accuracy of measurements and protective relay operations, leading to incorrect readings and potential malfunctions in electrical systems. Minimizing phase error is crucial for reliable performance in metering and protection applications.