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Current transformer saturation can cause differential protective relay mal-operation. This paper presents a technique for overcoming current tramsformer saturation problem based on the measurements of the fundamentals' phase-angles of the secondary currents on both sides of the protected object. Mal-operation could be avoided by introducing these measurements to the phase comparison technique which has the ability to distinguish between internal and external faults..

Overcoming the CT saturation effect on unit protection schemes using fundamental phase comparison technique