FIGURE Q2 shows a four bus three phase power system. The generators, transformers and transmission line per unit reactance are given as follows: Generator G1, G2: XG= 0.05 pu Transformers T1, T2: Xt= 0.13 pu Transmission Line 2 – 3: XL = 0.50 pu Bus 1 Bus 2 Bus 3 Bus 4 Line G? FAULT FIGURE Q2 Evaluate the per unit fault current, fault MVA and voltage at all buses if a three phase bolted fault occurs at Bus 2.

FIGURE Q2 shows a four bus three phase power system. The generators, transformers and transmission line per unit reactance are given as follows: Generator G1, G2: XG= 0.05 pu Transformers T1, T2: Xt= 0.13 pu Transmission Line 2 – 3: XL = 0.50 pu Bus 1 Bus 2 Bus 3 Bus 4 Line G? FAULT FIGURE Q2 Evaluate the per unit fault current, fault MVA and voltage at all buses if a three phase bolted fault occurs at Bus 2.

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: 2. A 100 MVA, 18 kV generator, with per unit reactance of X”d = 0.19, X’d = 0.26, and Xd = 1.3 is…

A: In this question we need to find the initial symmetrical rms current in the line on the low voltage…

Q: fault location

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

Q: The per unit equivalent system of a power system is shown below. It is working at no load when a…

A: In this question we need to find a voltage at bus -3 when a three phase fault occurred at bus 3.

Q: Problem 5 Consider the system shown in the single-line diagram of Figure (3). All reactances are…

A: Single Line Diagram: A single-line diagram, often known as an SLD, is an electrical diagram or…

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: pecified in per unit. For generators, assume Z* =Z` =j0.2, Z° = j0.05 For transformers, assume Z' =…

Q: the fault current for a

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

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

Q: Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and…

A: As per the guidelines of Bartleby we supposed to answer 1st three subparts of the question. For…

Q: Symmetrical Fault Analysis Q.13 Topic Power Systems - Symmetrical Fault An... A 100MVA, 33KV…

A: Given- 100 MVA, 33 KV generator- Reactance =0.25 p.u., 0.45 p.u., & 0.05 p.u., To Find- The…

Q: The one line diagram of a simple 3-bus power system shown below. All impedances are expresses in per…

A: According to the question, we need to calculate the fault occurred on bus 3 is a three phase fault.

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

A: POWER SYSTEM: A power system is a network of electrical components that provide, transmit, and…

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: In a 7-bus system, the double line fault is occurred at bus -5. During fault the positive sequence…

A: Correct option is B Given V01= 0.0175 I = -j0.148

Q: 1. The subscript d in the generator subtransient reactance refers to: 1. Generator 2. Generator 3.…

A: Subtransient: It occurs extremely fast- faster than even transient. The subtransient time period…

Q: b) The single line diagram of a power system is shown in Figure Q2.1 including generator and…

A: Givenlength of line =50 kmMVA base = 100 MVAFor line , base voltage =11 kV

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

Q: Q1/ for the four-bus power system shown in figure 1, the positive, negative and zero sequence…

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

Q: The single line diagram of a power system is shown in Figure Q2.1 including generator and…

A: Given length of line =50 km MVA base = 100 MVA For line , base voltage =11 kV

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

FIGURE Q2 shows a four bus three phase power system. The generators,
transformers and transmission line per unit reactance are given as follows:
Generator G1, G2: XG= 0.05 pu
Transformers T1, T2: XT= 0.13 pu
Transmission Line 2 – 3: XL = 0.50 pu
Bus 1
Bus 2
Bus 3
Bus 4
Line
GI
T1
G2
FAULT
FIGURE Q2
Evaluate the per unit fault current, fault MVA and voltage at all buses if a three
phase bolted fault occurs at Bus 2.

Expert Solution

This question has been solved!

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

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 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

Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 3. And give the bellow answer For a symmetrical three phase fault on the bus 3 1. Calculate the fault current in ampere and fault power in MVA and the fault current contribution from the generator connected to the bus 3.
A three-phase, 100-MVA, 20-kV generator is connected to a three-phase, 100-MVA, 20-kV motor through a transmission line. The reactances of the generator and motor are 0.25 and 0.20 per unit, respectively. The line reactance is 0.10 per unit. The motor is taking 50 [MW] at 0.8 power factor leading at rated voltage. Suppose a three-phase short circuit occurs at the generator terminals, determine the transient currents in the generator and motor as well as the short-circuit current.
Figure 1 shows a three-bus power system network of an electric utility company with each generator is represented by an electromotive force (e.m.f.) behind the transient reactance. All impedances are expressed in per unit on a common MVA base. The pre-fault system is on noload condition with 1.0 per unit voltage, and pre-fault currents are zero. All answer must be given in FOUR (4) decimal points. (a) Construct the bus impedance matrix for the system using building algorithm method.
The subject is: Smart Grid Applications and Technologies
For the following single line diagram of a three-phase system, a three-phase fault occurs at point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault current in pu and original value at point P. Take, the given kVA and kV of the G1 as the new base. [hint: the transient and sub-transient reactances of the synchronous generators are assumed to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient reactance.] 20,000 KV A 6.9KV I5メ G1 yo00 KVA 14% 5KV M Tz (G2 11/33KV 33/69 AV lond 5+j8 2 20000KVA 15070 KVA 10% 12% 25,000 KVA 6.9KV [AH the mpedances are given per-unit values) 8% as orebtraen sient ww
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.
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
Please help
1 Example-1: In a single-loop distribution system shown in the figure consider the generator to be of infinite short-circuitcapacity and with a voltage of 1.0 pu. Determine the fault currents flowing in circuit breakers B1, B2 and Bz for a Three phase to ground fault in the midde of line 4-5 when: a) Both transformers, T, and T2 are in service b) Only T1 is in service 1 T1 2 From То Impedance 0.0 + j0.01(T,) 0.0 + j0.01(T2) 0.0 + j0.08 0.02 + j0.05 0.01 + j0.03 0.0 + j0.06 0.01 + j0.09 0.01 + j0.09 1 B. B2 Вз -머 3 4 4 T2 7 6 5 6. 7 7