(a) What are the TWO (2) characteristics of the induction machine rotor in a dynamicanalysis?(b) Determine the stator phase currents in d and q axes when the motor is operating atsynchronous speed of 1500 revolution per minute at time f-0.3 seconds in a balancedcondition with ia = 20 cos (507).(c) A 300 MVA, 22 kV, 0.9 power factor lagging, 50 Hz, 3 phase 4 pole synchronousgenerator has the following inductances and resistances associated with the stator andfield windings:laa = 3.276 +0.046 cos(20) mH,lab = -1.638 – 0.046 cos (20 + 60°) mH,latd = 35 cose mH,Ina = 580.80 mH,%3DRa = 0.0031 2,Rd = 0.0715 Q.(i)Determine La and Lq in Henrys.(ii)If the stator leakage inductance Li is 0.413 mH, determine Lad and Laq in Henrys.(iii) Draw the equivalent circuits in direct and quadrature axes for synchronousmachine for dynamic analysis. Include all answers in Q1.c(i) and Q1.c(ii) in thecircuit.

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What are the TWO (2) characteristics of the induction machine rotor in a dynamic analysis?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

(a) What are the TWO (2) characteristics of the induction machine rotor in a dynamic
analysis?
(b) Determine the stator phase currents in d and q axes when the motor is operating at
synchronous speed of 1500 revolution per minute at time f-0.3 seconds in a balanced
condition with ia = 20 cos (507).
(c) A 300 MVA, 22 kV, 0.9 power factor lagging, 50 Hz, 3 phase 4 pole synchronous
generator has the following inductances and resistances associated with the stator and
field windings:
laa = 3.276 +0.046 cos(20) mH,
lab = -1.638 – 0.046 cos (20 + 60°) mH,
latd = 35 cose mH,
Ina = 580.80 mH,
%3D
Ra = 0.0031 2,
Rd = 0.0715 Q.
(i)
Determine La and Lq in Henrys.
(ii)
If the stator leakage inductance Li is 0.413 mH, determine Lad and Laq in Henrys.
(iii) Draw the equivalent circuits in direct and quadrature axes for synchronous
machine for dynamic analysis. Include all answers in Q1.c(i) and Q1.c(ii) in the
circuit.

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