Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 7, Problem 7.3MCQ
The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The 6-bus power system network of an electric utility company is shown in the Figure below. The line and transformer data containing the subtransient series resistance and reactance in per unit, and one-half of the total capacitance in per unit susceptance on a 100-MVA base, is tabulated below. The prefault voltage profile of the power system as obtained from four iterations of the newton Raphson power flow method are provided below as well.
Hourly variation factor need to consider while dealing with the non-coincidence demand of different
loads
True
False
-The voltage magnitude and phase angle are the quantities to be determined after load flow analysis for ............bus.
-The total reactance of the transmission system is reduced by installing a series capacitor.
Select one:
True
False
Chapter 7 Solutions
Power System Analysis and Design (MindTap Course List)
Ch. 7 - Even though the fault current is not symmetrical...Ch. 7 - The amplitude of the sinusoidal symmetrical ac...Ch. 7 - Equipment ratings for the four-bus power system...Ch. 7 - Equipment ratings for the five-bus power system...Ch. 7 - Prob. 7.22PCh. 7 - A three-phase circuit breaker has a 15.5-kV rated...Ch. 7 - Prob. 7.32P
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
- The zero sequence impedance offered by the equipment to flow of .............equence currents.arrow_forwardConsidering two parallel three-phase circuits that are close together, when calculating the equivalent series-impedance and shunt-admittance matrices, mutual inductive and capacitive couplings between the two circuits can be neglected. True Falsearrow_forwardEquipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:    50 MVA, 12kV, X=0.2 per unit Generator G2: 100 MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the Thévenin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.arrow_forward
- Three-phase, 60-Hz synchronous generator is connected through a transformer and paralleltransmission lines to an infinite bus. All reactances are given in per-unit on a common systembase. If the infinite bus receives 1.0 per unit real power at 0.95 p.f. lagging, determinea) the internal voltage of the generator andb) the equation for the electrical power delivered by the generator versus its power angle δ.arrow_forwardCalculate the initial symmetrical short circuit current that will occur when a 3 phase short circuit error occurs at the F point in the Figure below İ k3 phase-max ?arrow_forwardDiscuss system demand and generator loadingarrow_forward
- Select generator rating as base valuearrow_forwarda) The Newmont Mining Company at Ahafo in the Bono region of Ghana requested a dedicated power supply line from Kumasi in the Ashanti region of Ghana to feed its mining roller mills. The World Bank helped the Government of Ghana to fund the project. A company won the bid and came up with the design specifications as follows:The system would be a three-phase 138-KV transmission line and the total power to be connected to the line is 49-MV and would be operating at a 0.85 lagging power factor due to the large rotating motors in the roller mills. The line constants would have length of 120km long line with Z = 95∟78ºΩ and Y = 0.001∟90ºS.They are proposing to use nominal -T circuit representation in their analysis. If they are to provide:(i) The A, B, C and D constants of the line.(ii) The voltage from Kumasi to the NewmontWhat are the values you think the company that won the bid would provide?b) Using the information provided in a) above, Newmont Mining Company wants to know:(i) The…arrow_forwarda) The Newmont Mining Company at Ahafo in the Bono region of Ghana requested a dedicated power supply line from Kumasi in the Ashanti region of Ghana to feed its mining roller mills. The World Bank helped the Government of Ghana to fund the project. A company won the bid and came up with the design specifications as follows:The system would be a three-phase 138-KV transmission line and the total power to be connected to the line is 49-MV and would be operating at a 0.85 lagging power factordue to the large rotating motors in the roller mills. The line constants would have lengthof 120km long line with Z = 95∟78ºΩ and Y = 0.001∟90ºS. They are proposing to use nominal -T circuit representation in their analysis. If they are to provide:(i) The A, B, C and D constants of the line. (ii) The voltage from Kumasi to the NewmontWhat are the values you think the company that won the bid would provide? b) Using the information provided in a) above, Newmont Mining Company wants to know:(i) The…arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...
Electrical Engineering
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:Cengage Learning
How does an Alternator Work ?; Author: Lesics;https://www.youtube.com/watch?v=tiKH48EMgKE;License: Standard Youtube License