Graphical Method for Estimating the Performance of Distance Relays During Faults and Power Swings

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[2]  E. E. George,et al.  Performance Requirements for Relays on Unusually Long Transmission Lines , 1943, Transactions of the American Institute of Electrical Engineers.

[3]  A. R. van C. Warrington,et al.  Application of the ohm and mho principles to protective relays , 1946, Electrical Engineering.