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The Fig P31 shows a power network with two parallel generators connected to a transformer feeding a transmission line Another transformer is connected to an infinite bus The star point of each

The Fig. P3.1 shows a power network with two parallel generators connected to a transformer feeding a transmission line. Another transformer is connected to an infinite bus. The star point of each transformer and the generator 1 and infinite bus are solidly grounded. The sequence reactances are given in Table P3.1 (a) Draw the sequence networks of the power system T. Determine the zgus of the zero-sequence. (ii) Determine the Zbus of the positive-sequence (iii) Determine the Zhs of the negative-sequence Find the Thevenin's equivalent circuit (b) (i) ?(G ?? Infinite Fig. P3.1 bus (c) (i) A line-to-ground fault occurs at F. Table P3.1 Positive Negative Zero 0.15 0.25 0.15 (d) Repeat (c)(i) -(iv) using the bus impedance Infinite Bus0.150.15 0.20 (ii) Determine the fault current (iii) Determine the bus voltages (iv) Determine line currents G1 G2 T1 & T2 0.15 0.25 0.15 0.08 (neutral isolated) oo 0.15 0.05 0.40 matrices of (b) Line 0.20

 

Jul 26 2020 View more View Less

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