Setting calculation of current section I, II and III protection for relay 1 A B с 3 80km 1 20km 2 4 t = 1.05 어 170 A Xan

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Setting calculation of current section I, II and III protection for relay 1 A B с 3 80km 1 20km 2 4 t = 1.05 어 170 A Xan=20110kVA K = 1.5 Kriel SS = 302 Kre =0.85 = 1.3 K"] = 1.1 K" = 1.2 rel Z1= 0.40/km rel Note: Because 110KV is the rated voltage, there is 5% voltage loss when it is sent to users through the line, so the bus of this voltage level is taken as 115kV in relay protect on calculation