A three-phase, Y-connected, 75-MVA, 27-kV synchronous generator has a synchronous reactance of 9.0 2 per phase. Using rated MVA and voltage as base values, determine the per unit reactance. Then refer this per unit value to a 100- MVA, 30-kV base.

A three-phase, Y-connected, 75-MVA, 27-kV synchronous generator has a synchronous reactance of 9.0 2 per phase. Using rated MVA and voltage as base values, determine the per unit reactance. Then refer this per unit value to a 100- MVA, 30-kV base.

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: A generating station has 4 sections busbars. Bach section busbar has a generator connected to it of…

A: Each section busbar has a generator connected to it with a rating of 5000 KVA and a reactance of…

Q: A three phase system cannot be obtained using two single phase source.

A: given two single phases source we need to obtain 3 phase source

Q: Need to find the line current and the phase current

A: A. Total power P= W1 +W2= 30-15= 15 kWB. Power factor = cos( 79.106) = 0.188, Angle φ=79.106° C.…

Q: OWER SYSTEM ANALYS The following currents were recorded under fault conditions in a three-phase…

A: In this question, choose the correct option What is angle of negative sequence current I2. We know…

Q: 24 - Which is marked with PE A) Phase B) Neutral C) Positive D) Ground E) Negative

A: In power systems, marking of the conductors is very important to avoid mismatch. Because during…

Q: 2. The sequence component of phase a current are: Zero sequence current = = Positive sequence…

A: Types of sequence current in unbalanced system Zero sequence current ( finite value ) Negative…

Q: Three parallel three-phase loads are supplied from a 207.85-Vrms, 60-Hz three-phase supply. The…

Q: Van = 330&angle;510°, Vbn = 330&angle;270°, Vcn = 330&angle;390°" A POSITIVE PHASE SEQUENCE B…

A: Conversion formula

Q: What is the standard three phase a.c. supply we are getting in Sultanate of Oman from power…

A: In the Sultanate of Oman, the electrification rate is 98%. and the standard three-phase a.c supply…

Q: Choose how to measure the line voltage VRY in three phase star connected system? a. Between R…

A: Line voltages are measured between two lines

Q: In a star connected three-phase balanced system, the angle between line voltage and phase voltage is…

A: Explanation: The phase voltages are VR, VY, VB they are part 1200 from each other We are considering…

Q: What is the angle between 'R' phase voltage and 'RY' line voltage in a balanced three-phase star-…

A: Given a balanced three phase system The positive phase sequence of the three phase is…

Q: Phase sequence in a balanced three phase system is RBY, if R reaches maximum at 90°, then B reaches…

A: In this question , we will find maximum peak of phase B with given sequence...

Q: For a given rating, three phase machine is smaller in size compared to that of single phase. Select…

A: To identify the machine size

Q: Choose the correct options of three-phase supply compared to single-phase supply: I. Three-phase…

A: Compare with single phase and third phase system.

Q: 19. The correct phase sequence must be used when the power being A. reactive power. B. true power.…

A: There are three types of power: Active power: It is across the resistive elements Reactive power :…

Q: Familiarity with three phase circuits: 8. An A-B-C positive phase sequence, delta connected 3 phase…

Q: 2. (A) In a 440 V, 3-phase balanced AC-system, a wattmeter is connected as follows: curren- coil(CC)…

A: The solution is given below

Q: Three parallel three-phase loads are supplied from a 207.85-Vrms, 60-Hz three-phase supply. The…

A: Load-1 power is 11 kW. 3*VL*IL*cosϕ=11000IL1=110003*207.85*0.6=50.93 A.IL1=50.93∠-53.13°…

Q: 3. What is the maximum phase-to-neutral PEAK voltage of a 34.5 kV nominal distribution system?…

A: Given, RMS voltage of nominal distribution, 34.5 kV Maximum voltage is 1.05 p.u.

Q: 2- The Purpose of using Unbalanced Three-phase Systems: Ji

A: Need to find purpose of using unbalanced three phase system

Q: Compared to three-phase systems, single phase systems have O Bigger size Lighter weight O Higher…

A: The benefits of choosing a 1 phase supply are because of the following reasons- The design is less…

Q: Phase sequence in a balanced three phase system is RYB, if Y reaches maximum at 210°, then B reaches…

A: If the phase sequence is RYB There will be a phase difference of 120 between them i.e Y phase lags R…

Q: A 3-phase motor is rated at 100VA 0.9pf lag when operated with 100V 60Hz. The motor must be operated…

A: The 3ϕ system can be drawn as Based on the rating of the Motor, the line current drawn by the motor…

Q: A 3-phase motor is rated at 100VA 0.9pf lag when operated with 100V 60Hz. The motor must be operated…

Q: 1. Design a three-phase system with a combination of three-phase and single-phase loads.

Q: In an unbalanced three phase system, having balanced supply phase voltages are separated by 120°…

A: The objective is to determine the correct option.

Q: = 600-90 and la The currents of 3-phase system are la0 = 350-90, Ia1 50-90. Compute the…

Q: In a three-phase circuit with symmetrical load conditions, each phase has Select one: O a. One…

A: Correct option is C As we all know in a three phase symmetrical load each phase has an equal amount…

Q: ) In three phase star connected system the Y phase voltage is measured between _____________ a.…

Q: 2- The Purpose of using Unbalanced Three-phase Systems: Ji

A: Need to find the purpose of using unbalanced three phase system

Q: 12. A balanced 3-phase supply is supplying the following loads: (i) A single-phase capacitor (ii) A…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: If the supply voltages to a 3-phase, 4-wice system are balanced The three phase load currents must…

A: Considering 3 phase 4 wire system case (a) 3 phase balanced load for balance load.IA, IB, IC load…

Q: 2- The Purpose of using Unbalanced Three-phase Systems: Jji

A: Actually we are not intentionally use the unbalanced system. Unbalanced system created due to the…

Q: In a star connected three-phase balanced (RYB) system, the phase angle between phase voltage ( VR…

A: In a star connected three-phase balanced (RYB) system, the phase angle between each phase is 120°.…

Q: How can we evaluate i123

Q: Draw the following: 1. sinusoidal true power waveforms of three phase balanced delta connected…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: For a delta connected three phase balanced system, a. Phase current is equal to line current and…

A: According to the question we have to discuss the delta-connected balance system.

Q: Three parallel three-phase loads are supplied from a 207.85-Vrms, 60-Hz three-phase supply. The…

Q: Calculate the magnitude of the positive sequence component of phase A current given the following…

A: In this question we will find positive sequence of component of phase A current...

Q: 1. We can change the sequence of a three- phase system by 2. The time of transient period is 3. In…

A: A three-phase system is a system with three-phase voltages, all three voltages are separated by an…

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

Three phase system

A three-phase, Y-connected, 75-MVA, 27-kV synchronous generator has a
synchronous reactance of 9.0 2 per phase. Using rated MVA and voltage as base
values, determine the per unit reactance. Then refer this per unit value to a 100-
MVA, 30-kV base.

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: Summarize the given data:

VIEW

Step 2: calculate the per unit impedance on rated MVA and voltages as base values:

VIEW

Step 3: Calculate the per unit reactance on 100 MVA, 30kV base:

VIEW

Solution

VIEW

Step by step

Solved in 4 steps with 7 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

A generating station has 4 sections busbars. Bach section busbar has a generator connected to it of rating 5000KVA,10% reactance and also each busbar is connected to a tibbar through reactors each having 7.5% reactance based upon the rating of the generator counected to it. Find the short circuit KVA, when thore is a 3-phase fault between the lines on one of the sections of busbars (a) with and (b) without reactors. The answers must be the ff: Ans: (a) 87,500KVA (b) 200,000KVA
1. What are the types of connections in three phase load, which connection is best? Justify your answer.
If Ibc is equal to 661.643∠159 and Ia is 382angle;69,the phase sequence is:" POSITIVE NEGATIVE
c) Calculate the phase voltages of the following zero, positive, and negative sequences of phase “a" given as follows: Vao = 20045° V Vai = 2052 – 30° V Vaz = 1534196° V
Draw the circuit diagram of power system layout with three phase CT and three phase PT.
The current from neutral to ground connection is 12 A. Calculate the zero phase sequence components in phases.
1. Explain the advantages and disadvantages of Single Phase and Three Phase Power Supply. Justify why Three phase supply is preferred over Single Phase Supply
12
ASAP
In a +ve sequence 3-phase supply, _________________________ a. Angle between voltages in Y and R phase is 0 degree b. Angle between voltages in Y and R phase is 180 degree c. Angle between voltages in Y and R phase is 120 degree d. Angle between voltages in Y and R phase is 90 degree
QAMuses two carriers, one in-phase and the other quadrature. Explain?
Benefits of 3 phase system over 1 phase system... Don't copy