Question

Assume a round-rotor generator delivering power in the steady state to a load bus through two transformers and a transmission line. The topology of the system is shown as below XL Хо Xi/2 XP Figure Q5 Parameters are as follows: G: Xgi -0.10 TI: Х,1-0, 10 12: XT2-0.20 0.40 Initial state: E1-1 .6 ,見= 1.6 (a) Please determine the maximal real power that can be delivered through the transmission system. (b) Please determine 6 at the steady state. (c) Assume a three-phase-ground fault via an impedance Xp 0.4 happens at the middle of the transmission line (point O), please find the instantaneous generator power Pre-fl(S) and Ppaul-on (6) for the pre-fault and fault-on systems. (d) Please determine the critical clearing angle for the above fault.

Answer 1

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nm 30. 2 0-2 ta, unu ustuu tuǐ女..ur reactance 31-2 P Λ.cqu.volaょ孖ttu RgA" s 333 Sin 5313) 1.0666 pu Aw

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Accelaretingc 从 s08905 Cos 2cLrIj£1.lt 8 IG nad=g4.89 う eus)nar