QUESTION 1 A 100 km, 400 kV transmission line is subject to an “a" phase to earth fault at 80 km. If the fault path resistance is 10 2, calculate the fault current. Data:- For generation: Za1 = Za2 = 1 + j16 N and Zao = 0.5 + j8 N For the line: ZLI = ZL2 = 1.8 + j31 N and ZLo= 10 + j88 N

QUESTION 1 A 100 km, 400 kV transmission line is subject to an “a" phase to earth fault at 80 km. If the fault path resistance is 10 2, calculate the fault current. Data:- For generation: Za1 = Za2 = 1 + j16 N and Zao = 0.5 + j8 N For the line: ZLI = ZL2 = 1.8 + j31 N and ZLo= 10 + j88 N

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...

See similar textbooks

Related questions

Q: If a generator double-line-to-line fault occurs across "b" and "c" to ground, and Ea = 235 VZ0°, Z,…

A: In this question we need to find a sequence current , fault current and sequence voltage.

Q: fault location

A: Types of open circuit fault- 1) Symmetrical fault- Three phase line to ground fault Three phase…

Q: Two alternators rated 15 MVA and 20 MVA have per unit reactance of 0.20 and 0.60 respectively are…

A: In this question, Two alternators rated 15 MVA and 20 MVA have per unit reactance of 0.20 and 0.60…

Q: For the following single line diagram of a three-phase system, a three-phase fault occurs at point P…

A: Given data : G1 = 20mvA = 6.9kv which is taken as base value Xg1 = 0.15 pXg2 at new Base =…

Q: 3.On a double line-to-ground faultImmersive reader A) The short-circuit currents in the faulted…

A: In this question , we will write about double line to ground fault....

Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV…

A: Given Phase voltage = 2.2kv S = 80MVA FIND CURRENT

Q: A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the…

A: x=1y=7Note: reactance of element right to bus 4 is not given. Hence we will not consider that in…

Q: ure shows a sample power system network and Zpus Matrix elements. For a solid three phase fault take…

Q: Figure shows a sample power system network and Zpus Matrix elements. For a solid three phase fault…

Q: 1 Xline = j0.30 00 X" = j0.15 X" = j0.20 Xiine = j0.30 Xire = j0.30 %3D 3 1. Find the Thévenin…

A: The answer as given below:

Q: the fault current for a

A: Types of open circuit fault- 1) Symmetrical fault- Three phase line to ground fault Three phase…

Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV…

A: Fault current level? of the breaking capacity 70MVA Voltages = 4.6kV

Q: In a short-circuit test on a 3-pole, 220 kV circuit breaker. Power factor of the fault = 0.8…

Q: Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence…

A: Given- Line to ground fault- Current in the faulted phase=100 A, To Find- The zero-sequence current.

Q: Problem 7. Three-phase Balanced Fault Analysis. For the two-generator system below, a three-phase…

Q: For the network shown in the figure below, all reactances are in p.u. to a base of 100MVA and 13.8…

A: The power system is a network consist of power generation, transmission, and distribution. Power…

Q: Figure shows a sample power system network and Zpus Matrix elements. For a solid three phase fault…

A: Note: Here line impedance as well as Z bus matrix impedance are given We are going to solve the…

Q: Let the system of Figure 1 operating with mechanical input Pm at a steady angle ĉo. A three phase…

A: If a fault occurs in the system, δ begins to increase under the influence of positive accelerating…

Q: ort-circuit occurs at its terminals. The fault MVA and fault

A: In this question, alternator ratings are given..3 phase short circuit occurs at terminals..We have…

Q: b) A fault occurs at bus 2 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 3.3 kV…

A: Given Phase voltage = 3.3kv S = 60 MVA FIND CURRENT

Q: For the following single line diagram of a three-phase system, a three-phase fault occurs at point P…

A: The fault occurs at P. Transient reactance of the motor, Xm'(pu)=1.7*0.14 =0.238

Q: The LLLG fault occurs at bus-6 with pre-fault voltage as 1.05 p.u. If the positive sequence…

A: Given, The pre-fault voltage at bus-6 is V6 = 1.05 pu Positive sequence impedance at bus-7 is Z7 =…

Q: A phase to phase fault (betvieen phases b and ) has occurred at the Y side of 100 MVA 132/33 kV AY1-…

A: We can redraw the circuit as

Q: ence components of the fault current are as Ipositive 12 p.u., Inegative and Izero The type of fault…

A: SOLVE ABOVE QUES

Q: 7.In a line-to-ground fault we can expect that A) There are no currents to ground. B) The…

A: Single line to ground fault is asymetrical fault that makes the system unbalance. Sequence networks…

Q: A line to ground fault occurs on the terminals of an alternator, sequence voltages and sequence…

A: The given data is shown below:

Q: Problem #2: A transformer is fed from a 100 MVA, 18 kV generator via a 5-cycle breaker. Generator…

A: Given S =100 MVA V =18 KV Xd'' =18%Xd' =25%Xd =120%

Q: A fault which gives rise to symmetrical fault currents (equal faults currents with 120-degree…

A: Symmetrical fault: When three phase lines are balanced, when ever a fault occurs betwe these lines…

Q: :A three phase alternator 100 MVA, 13.5 KV, exposure to types of faults are fallowing: Balanced…

Q: Problem 1(B)- If the fault in Problem 1(A) was a Line-Line fault between phases B and C through a…

Q: Which of the following is a true statement concerning the production of electricity in conventional…

A: given data: Which of the following is a true statement concerning the production of electricity in…

Q: For the following power system, all bus voltages are initially 1 1 pu. Then a three-phase fault…

A: The reactance diagram of the given system will be After a 3-phase fault, the fault point will be…

Q: FROM THE DIAGRAM ATTACHED SOLVE FOR i) An equation for the fault current when a…

Q: The one-line diagram of a simple three- bus power system is shown below. Each generator is…

A: In this question we need to find a 3phase fault across bus 1 .

Q: Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence…

Q: The system values are given below. The bus 1 voltage after fault =6.18 p.u. The bus 2 voltage after…

A: Following Data is given in the question V1 = 6.18 p.u. V2 = 2.54 p.u. Y12 =3.25 p.u. Fault Current…

Q: A 3-phase, 3-wire system has a normal voltage of 10-4 kV between the lines. It is supplied by a…

A: We have 3-Phase, 3-Wire system with, Normal Voltage (Vl) = 10.4 KV = 10.4 * 103 V Generator Positive…

Q: Consider the single-line diagram of a power system shown below. The transient reactance of cach part…

A: The above question is based on symmetrical fault analysis. All reactances are already given in pu…

Q: Q2) The single-line diagram of a three-phase power system is shown in the figure below. The inductor…

A: Solution:Given data:Synchronous generators3 rating = 1000 KVA , 750 kVA , 500 kVA and give…

Q: The 60 mile, 115 kV line GH (Figure P12.8) is operating with the voltages at each end 30° out of…

Q: Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence…

Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

StaySafe Orangel. 36
O O 73
11:50
WearAMask M|..
Edit
88
50
University of Botswana
Faculty of Engineering and Technology
Department of Electrical Engineering
EEB 465 - Analysis of Power Systems
and
EEB 525 - Power Systems Analysis
Due Date: 2nd May 2022
Assignment 2
QUESTION 1
A 100 km, 400 kV transmission line is subject to an "a" phase to earth fault
at 80 km. If the fault path resistance is 10 2, calculate the fault current.
Data:-
For generation:
Zs1 = Zs2 = 1 + j16 N and Zs0 = 0.5 + j8 N
For the line:
ZLI = ZL2 = 1.8 + j31 2 and ZLO = 10 + j88 2
QUESTION 2
What are the fundamental differences between primary and back-up
protection?
EEB 465 - EEB 525
By: Prof. E. Matlotse
Page 1
DO
DO
W
Tools
Mobile View
Share
PDF to DOC

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

cmos
A 3-phase generator (30 MVA, 13.8 KV, 0.15) supplies two motors (rated at 20 MVA, 12.8 KV, 20%, and 10 MVA, 12.8 KV, 20%, respectively) through a step-up transformer - transmission line - step- down transformer arrangement. The 3-phase transformers are rated at 35 MVA, 13.2 KV-A/115 KV-Y with 10 % leakage reactance. The line reactance is 80 ohms. Draw the equivalent per unit reactance diagram by selecting 30 MVA, 13.8 KV in the generator circuit. Also, calculate the current supplied by the source and the currents of each motor
4.In a double line-to-ground fault we can expect thatImmersive reader A) There are currents in the ground connections. B) The current values in the ground connections are zero. C) Short-circuit currents exist in all three phases. D) The currents in the faulted phases are equal. E) N. A.
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
The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV and breaking capacity 50 MVA is . . kA.
(Q.2) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF.) in pu and in kA, and fault MVA (ie. short-circuit level) at the indicated locations. Internal reactance of generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side. 113.3 kV 4 MVA, 7% j0.5 2 j0.4 2 300 A 200 A 11 KV 250 MVA
Q.3 When a line-to-ground fault occurs, the current in faulted phase 'a' is 100A. The zero-sequence current in phase 'c' is
A hydro powered 50 MVA generator, with a synchronous reactance 0.33 p.u., delivers 40 MW over a transmission line of 0.15 p.u. reactance to an infinite system. A 3-phase short circuit transient fault occurs on the busbar between the generator and transmission line. Given that the generator emf is 1.4 p.u. prior to and during the fault and all reactances are to a 50 MVA base: Sketch the single line schematic diagram of the system. Determine the maximum load angle the generator can swing to without losing stability. i) ii) iii) iv) Sketch the corresponding power-angle curve for the system showing the accelerating and decelerating areas. Calculate the critical clearing angle of the system to keep its stability.
If the source impedance at a 13.2 kV distribution substation bus is (0:5 + 1:5) Q per phase, compute the RMS and maximum peak instantaneous value of the fault current, for a balanced three-phase fault. For the system (X/R) ratio of 3.0, the asymmetrical factor is 1.9495 and the time of peak is 7.1 ms (see Problem 1). Comment on the withstanding peak current capability to which all substation electrical equipment need to be designed. Problem 1 Consider the expression for i(f) given by i(t) = v21ms [sin(@t-0-)+ sin 0,.eR/X)] where ez = tan-1 (WL/R). (a) For (X/R) equal to zero and infinity, plot i(f) as a function of (wf). (b) Comment on the DC offset of the fault current waveforms. (c) Find the asymmetrical current factor and the time of peak, tp, in milliseconds, for (X/R) ratios of zero and infinity.
please solve it before 10 min
Line to line to line fault is an asymmetrical type of fault in power system which occurs very frequently true false
In a short circuit test on a 120 kV, 3 phase system, the breaker gave the following results: p.f. of fault 0.6, recovery voltage 0.9 times full line voltage, breaker current symmetrical, and restriking transient had a natural frequency 12 kHz. Determine average RRRV. Assume fault is grounded.