Draw the reactance diagram with all reactance marked in p.u. Select the generator rating as the base in the generator circuit.
A 50 MVA, 15 kV three phase generator has a subtransient reactance of 0.2 p.u. The generator supplies two motors over a transmission line having transformers at both ends as shown in Fig. The motors have rated inputs of 30 MVA and 20 MVA both 30 kV with 0.15 p.u. subtransient reactance. The rating of the sending end transformer, Tr1 is 50 MVA, 11 kV / 132 kV with leakage reactance of 0.1 p.u. Transformer Tr2 at the receiving end has three single phase transformers and the rating of each individual transformer is 20 MVA , 33 / 76 kV with leakage reactance of 0.12 p.u. Series reactance of the line is 25 ohms. Draw the reactance diagram with all reactance marked in p.u. Select the generator rating as the base in the generator circuit.
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