positive sequence components having phase sequence the same as the * .original phasors true false The value of diagonal elements in Y- bus, are the admittance which are connected between bus i and j with negative sign true false The sub transient reactance is larger * than transient reactance true false

positive sequence components having phase sequence the same as the * .original phasors true false The value of diagonal elements in Y- bus, are the admittance which are connected between bus i and j with negative sign true false The sub transient reactance is larger * than transient reactance true false

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The subject is: Smart Grid Applications and Technologies
X 0.1j Z12 = 0.1 j Z23 = 0.1 j 0.2 j KAY 02) 0.1j Load 1 Load 2 Load 3 Consider the single line diagram shown in the figure. All impedances are expressed in per unit on a common 100 MVA base. The generator transient reactance =0.5 j. The Bus 1 prefault voltage (1 + 0.0 j). If a bolted three phase fault occur at bus 1. The magnitude of fault current is: Select one O a. 5.8 pu b. 7.5 pu c. less than 5.8 pu O d. 11.6667 pu e. greater than 12.0 pu
In a star-delta phase shifting transformer, the zero sequence currents cannot flow through the it True False
A system of three currents equal in magnitude and having zero phase displacement, these are called. Select one: a. None of above b. negative phase sequence components c. positive phase sequence components. d. zero phase sequence components
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
5) Non minimum phase systems are also non causal. ) True False
Question 3. A three-phase impedance load balanced D a connected load in parallel with a balanced ? connected load made of bonding. D each arm for the load ?D = 6 + 6? and ? each arm for the connected load It is given as ?? = 2 + 2?. ? the connected load ?? = 1? is earthed through the neutral impedance. To this impedance load, the symmetrical component voltages ?0 = 10∠60°, ?1 = 100∠0° and ?2 = Unbalanced phase-to-earth voltages ??, ?? and ?? of 15∠200° volts were applied. a) Draw the zero, positive and negative sequence circuits. b) Find the complex powers imparted to each component circuit.
Write ‘T’ for True and ‘F’ for False 1. The power factor of a pure resistive load is unity. 2.The phase shift angle of a Δ-Y transformer can only be 30⁰ 3.L-G, L-L, L-L-g they all are symmetrical faults in power system analysis. 4.For L-L faults IB = IC. 5.Constant A, B, C, D represents the voltage of a transmission line.
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
Why the elements of Jacobian matrix belong to derivative of reactive power of a voltage controlled bus with respect to angle and magnitude of voltage is equal to zero.
A 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and 0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The transmission line is connected to another Wye-Delta transformer and then to a three-phase load with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0. A single line-to-line fault occurs at the end of the transmission line on phases B and C. a. Draw the sequence networks b. Compute the Sequence currents c. Compute the faulted phase currents
10. A three-phase transformer consists of a bank of single-phase transformers connected to form a Dd0 connection. A fault on one of the transformers causes it to be removed from the circuit, and the remaining two transformers are connected in an open-delta (V-V) connection. Show that the capacity of the open-delta connected transformers is 58% of the delta-connected transformers.