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03000EE308052001

With the aid of a neat labelled circuit diagram, explain the operation of any one
slip-power-recovery scheme induction motor drive.
PART D

Answer any two full questions, each carries 10 marks
With the help of a neat, labelled circuit diagram, explain the concept of current-
source-inverter (CSI) fed induction motor drive.
A 50079, three-phase, 3.3kV, 4-pole, 0.8 pf lag, star connected synchronous
motor has following parameters:
Synchronous reactance X, = 15Q; Rotor Resistance R, = 0Q.
Calculate the per phase excitation voltage in polar form.
With the help of a neat, labelled circuit diagram, explain the concept of current-
source-inverter (CSI) fed induction motor drive.
Explain the reason which facilitates the use of thyristor switches for load
commutated inverters to drive synchronous motors. What is the condition to be
satisfied for the thyristor based load commutated inverter to work?
Explain Park’s Transformation with reference to space vectors. Write down the
transformation matrices.
With the help of a neat labelled diagram, explain the working principle, salient
features and the advantages of Self Controlled Mode of operation of a

Synchronous motor.

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