5.26 An unloaded generator with a pre-fault voltagect1 pu has the following sequence impedance:Z, = j0. 15 pu, Z, = Z, = j0.25 puThe neutral is grounded with a reactance of0.05 pu. The fault current in pu for a single-line toground fault is(a) 3.75 pu(c) 6 pu(b) 4.28 pu(d) 7.25 pu

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Answered: 5.26 An unloaded generator with a…

Introductory Circuit Analysis (13th Edition)

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3. Single-phase T1-transformer with a power of 500 kVA and a single-phase T2- with a power of 400 kVAtransformers are connected in parallel and load 1000 kVA with 0.8-back power factor.they are feeding. The equivalent circuit winding resistance of T1 is 0.025 b and the equivalent circuit reactance is 0.06is b. The equivalent winding resistance of T2 is 0.016 b and the equivalent circuit reactance is 0.07 b. Bothhas the same conversion ratio in the transformer.a. Draw the connection diagram given in the question. b. Obtain the power sharing expression over the parameters given in the question. c. Calculate the kVA values and power factors of the transformers.
A star connected neutral grounded 3-phase synchronous generator consists of 0.1 p.u of sub transient reactance ,0.3 p.u of transient reactance and 0.5 p.u of leakage reactance.The zero sequence reactance of the synchronous reactance is None of the above 0.5 p.u 0.7 p.u 0.6 p.u
A short transmission line connects a step-up transformer on the source side with a series impedance of j0.5 ohms (referred to the primary) to a step-down transformer on the load side with a series impedance of 50 ohms (referred to the primary). The turn ratio of the step-up transformer is 1:14 and a no-load primary voltage of 17 (line-to-line) kV. The step- down transformer has a turn ratio of 18:1 and it has a Y-connected, balanced load of 0.463 +j 0.0772 ohms connected to its secondary side. A capacitor bank of -j0.324 ohms is added parallel to the load. Assuming an ideal transmission line, the effective impedance (per phase) of the system seen by the source would be: O A. 0.292 + j0.375 O B. None of the other choices are correct O C. 0.584 + j0.750 O D.0.196 + j0.158 O E. 5.84 + j7.5
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The following are the data for the unloaded synchronous generator with neutral is solidly grounded. positive sequence generated voltage= 120°p.u positive sequence current = 2.2p.u positive sequence impedance= 0.07p.u The positive sequence component of voltage Va1 is
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5.26 An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z = 0.15 pu, Z, = Z, = j0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for a single-line to %3D ground fault is (a) 3.75 pu (b) 4.28 pu (c) 6 pu (d) 7.25 pu