A 30 MVA, 13.2KV synchronous generator has a solidly grounded neutral. Its positive, negative and zero sequence impedances are 0.3, 0.4 and 0.05 p.u respectively What value of reactance in p.u. must be placed in the generator neutral so that the fault current for a line to ground fault shall not exceed the rated line current? O 0.65 O 0.7 0.75 0.6 0.68 0.63 O 0.8 0.79

A 30 MVA, 13.2KV synchronous generator has a solidly grounded neutral. Its positive, negative and zero sequence impedances are 0.3, 0.4 and 0.05 p.u respectively What value of reactance in p.u. must be placed in the generator neutral so that the fault current for a line to ground fault shall not exceed the rated line current? O 0.65 O 0.7 0.75 0.6 0.68 0.63 O 0.8 0.79

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Q2\ The one-line diagram of a simple power system is shown in figure below. All impedances are expressed in per unit (pu) on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage. A three-phase fault occurs at bus 1 through a fault impedance of Zf = j0.08 per unit. Using Thevenin's theorem obtain the impedance to the point of fault and the fault current in per unit. Determine the bus voltages and line currents of generators during fault. X₁ = = 0.1 XT-0.1 3 1 to ojo XL=0.2 2 040 X₁ = 0.1
Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a Find the fault current due to a bolted- three-phase short circuit at bus 3 b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions 0.06 p.u. 0.2 p.u. 0.04 p.u. 0.25 p.u. 0.2 p.u. 0.2 p.. 0.2 p.u. 0.06 p.u. 0.25 p.u. Figure (3) Single-line diagram ele ver ele 888 ele 0.06 p.u. 0.25 p.u.
-The symmetrical fault occurs in the terminals of the synchronous generator. Find the direct axis transient reactance of the synchronous generator under the transient period for the data given below, Leakage reactance(Xl)= 1.3 ohm, Armature reactance (Xad)= 1.6 ohm and field reactance (Xf)=5.4 ohm. 2.10 2.53 1.23 4.00 -The existing condition of the power system can be determined by _____________ analysis. Short Circuit Stability Power Flow Transient
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
The negative sequence current of a solidly grounded generator for single line to ground fault is j 2.5 p.u. Then the positive sequence current during the fault is equal to o j7.5 pu o jo.75 pu o j2.5 pu o jo.25p.u
The reactance of the synchronous generator after sometime of the fault cleared is ............
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(b) A 30000 kVA, 13.8 kV generator with X = 18% is connected to a bus which supplies two identical motors as shown in the Figure 2. The subtransient reactance X of each motor is 25% on a base of 6000 kVA, 7 kV. The bus voltage at the motors is 7 kV when a three phase fault occurs at the point P. For the fault specified, determine (a) the subtransient current in the fault (b) the subtransient current in breaker A and (c) the symmetrical short circuit interrupting current in the fault and in breaker A. юю DO A P 0-0 Gen. Figure 2 Motors
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EXPLAIN THE THREE-PHASE GENERATED EMF PRODUCED BY SYNCHRONOUSALTERNATOR.
In the shown below power system, both generators G1 and G2 emf’s are equal.All the system data are shown on the system diagram.a) Draw the system diagram in per unit using (MVA)base = 75 and (KV)base =20 KV in the generators side.b) Calculate the three-phase balanced short circuit current (If) at busbar 3 inAmpere and the fault level (MVA)sc in MVA.c) If the fault at busbar 3 is a line-to-line fault, calculate the fault current inAmpere and the fault level (MVA)sc in MVA.