Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase ...
Start Learning for Free
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd = 1.8 Ω and quadrature axis synchronous reactance Xq = 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-
Correct answer is between '-37,-36'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous ...
For logging load in salient pole motor,
ψ = 0.338°
δ + ψ = 3.338°
⇒ δ = 0.338° - 36.86° = -36.52°
Most Upvoted Answer
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous ...
Ohms and quadrature axis synchronous reactance Xq= 1.5 ohms. The stator resistance per phase is 0.1 ohms.
(a) Calculate the synchronous reactance per phase.
Synchronous reactance per phase, Xs = √(Xd^2 + Xq^2)
Xs = √(1.8^2 + 1.5^2) = 2.3 ohms
(b) Calculate the per phase synchronous impedance.
Per phase synchronous impedance, Zs = √(R^2 + Xs^2)
where R is the stator resistance per phase
Zs = √(0.1^2 + 2.3^2) = 2.3 ohms
(c) Calculate the per phase voltage induced in the motor at full load when the power factor is 0.8 lagging.
At full load, the apparent power input to the motor is 60 MVA or 60,000 kVA.
The per phase apparent power input is 60,000/3 = 20,000 kVA.
The power factor is 0.8 lagging, so the per phase real power input is 20,000 x 0.8 = 16,000 kW.
Per phase voltage induced, Vph = (P / (3 x V x cosφ)) + (j x Q / (3 x V x sinφ))
where V is the line voltage, φ is the phase angle between the voltage and current, and Q is the per phase reactive power.
At full load, Q = √(S^2 - P^2) = √(20,000^2 - 16,000^2) = 12,649 kVAR
Vph = (16,000 x 10^3) / (3 x 11 x 10^3 x 0.8) + (j x 12,649 x 10^3 / (3 x 11 x 10^3 x 0.6))
Vph = 108.7 - j 120.8 kV
(d) Calculate the per phase current at full load.
Per phase current, Iph = S / (3 x Vph)
Iph = 20,000 x 10^3 / (3 x 108.7 x 10^3) = 193.8 A
(a) Calculate the synchronous reactance per phase.
Synchronous reactance per phase, Xs = √(Xd^2 + Xq^2)
Xs = √(1.8^2 + 1.5^2) = 2.3 ohms
(b) Calculate the per phase synchronous impedance.
Per phase synchronous impedance, Zs = √(R^2 + Xs^2)
where R is the stator resistance per phase
Zs = √(0.1^2 + 2.3^2) = 2.3 ohms
(c) Calculate the per phase voltage induced in the motor at full load when the power factor is 0.8 lagging.
At full load, the apparent power input to the motor is 60 MVA or 60,000 kVA.
The per phase apparent power input is 60,000/3 = 20,000 kVA.
The power factor is 0.8 lagging, so the per phase real power input is 20,000 x 0.8 = 16,000 kW.
Per phase voltage induced, Vph = (P / (3 x V x cosφ)) + (j x Q / (3 x V x sinφ))
where V is the line voltage, φ is the phase angle between the voltage and current, and Q is the per phase reactive power.
At full load, Q = √(S^2 - P^2) = √(20,000^2 - 16,000^2) = 12,649 kVAR
Vph = (16,000 x 10^3) / (3 x 11 x 10^3 x 0.8) + (j x 12,649 x 10^3 / (3 x 11 x 10^3 x 0.6))
Vph = 108.7 - j 120.8 kV
(d) Calculate the per phase current at full load.
Per phase current, Iph = S / (3 x Vph)
Iph = 20,000 x 10^3 / (3 x 108.7 x 10^3) = 193.8 A
Attention Electrical Engineering (EE) Students!
To make sure you are not studying endlessly, EduRev has designed Electrical Engineering (EE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electrical Engineering (EE).
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Similar Electrical Engineering (EE) Doubts
Top Courses for Electrical Engineering (EE)View all
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer?
Question Description
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer?.
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer?.
Solutions for A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer?, a detailed solution for A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? has been provided alongside types of A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A 60 MVA, 11 kV, 50 Hz, Y connected, 3 phase salient pole synchronous motor has direct axis synchronous reactance Xd= 1.8 Ω and quadrature axis synchronous reactance Xq= 1.2 Ω. If the armature resistance is negligible and full load power factor is 0.8 log. The power angle is-Correct answer is between '-37,-36'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
|
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup