Question
A 250 MVA, 11 kV three-phase generator has a sub transient reactance of 10%. The generator supplies a number of synchronous motors over 64-km transmission
A 250 MVA, 11 kV three-phase generator has a sub transient reactance of 10%. The generator supplies a number of synchronous motors over 64-km transmission line having transformers at both ends, as shown in Figure B3. m you Me Figure B3 The motors, all rated 13.2 kV, are represented by just two equivalent motors. Rated inputs to the motors are 100 MVA and 50 MVA for MI and M2, respectively. For both motors X" - 12%. The three phase transformer Ti is rated 200 MVA, 11/220kV with leakage reactance of 10%. Transformer T2 is composed of three single-phase transformers each rated 220/13.2 kV, 180 MVA with leakage reactance of 12%. Series reactance of the transmission line is 0.5+j0.6 g/km. Draw the impedance diagram, with all reactance marked in per-unit. (Assume the generator voltage as base voltage and SOOMVA as base power) [5]
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