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Generator protection and CT-saturation problems and solutions

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2 Author(s)
Kasztenny, B. ; Gen. Electr., Markham, Ont., Canada ; Finney, D.

This paper presents a new generator relay design, stator differential function in particular, coping with extreme cases of current transformer (CT) saturation: both ac saturation under large currents and/or residual flux; and dc saturation under low currents but large and long-lasting dc components. The algorithm is a subcycle algorithm with fastest times reaching half a cycle including overall response of the relay hardware. Analysis of the response of a traditional differential function under CT saturation is included to provide setting guidelines for legacy relays.

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Industry Applications, IEEE Transactions on  (Volume:41 ,  Issue: 6 )