G उह T₁ Line 3 M T₂
The ff. figure shows the single-line diagram consisting of a synchronous generator feeding a synchronous motor through two transformers and a transmission line. The generator is rated 100 MVA, 13.8 kV with Xd” = 0.15 pu. The synchronous motor is rated 100 MVA, 13.8 kV with Xd” = 0.20 pu. Both three-phase transformers are rated 100 MVA, 13.8/138 kV with leakage reactance of 0.10 pu. The series reactance of the line is 20 ohms. The synchronous generator is operating at rated MVA, 0.95 pf lagging and at 5% above rated voltage when a bolted three-phase fault occurs at the generator terminals. Calculate the pu values of (a) subtransient fault current and (b) subtransient generator and motor currents during this fault.
Step by step
Solved in 2 steps with 3 images
