• Setting calculation of current section I, II and III protection for relay 1 А B с 1 20km 2 3 80km 4 t=105 * Xan = 20 1

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• Setting calculation of current section I, II and III protection for relay 1 А B с 1 20km 2 3 80km 4 t=105 * Xan = 20 110kv 170 A K = 1.5 Kid = 1.3 302 K" = 1.1 Ke = 0.85 K" =1.2 Z1=0.40/km AK rel rel re 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 protection calculation