Computer Models of Current Transformers in the Presence of Harmonic Distortion
A theoretical analysis of CTs behavior has been developed by means of the equivalent circuit. The CTs performance under distorted conditions is usually characterized by means of the frequency response test. Models of the instrument transformers are especially important for studying CT saturation, ferro-resonance phenomena, harmonics and sub-harmonics and their effect on the performance of protective relaying. The main features of the two CT models
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