b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the perphase equivalent circuit parameters of ( R1= R2= 0.12 , X1 = X2 = 0.6 , Xm=12 ) n and 2 = 20L0°. Use exact equivalent circuit to determine thefollowing at rated slip of 0.03:I.Stator currentI.Magnetizing currentII.Power factorIV.Developed torque

b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R1= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) 2 and l2 = 20L0°. Use exact equivalent circuit to determine the following at rated slip of 0.03 : I. Stator current I. Magnetizing current II. Power factor Developed torque IV.

b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R1= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) 2 and l2 = 20L0°. Use exact equivalent circuit to determine the following at rated slip of 0.03 : I. Stator current I. Magnetizing current II. Power factor Developed torque IV.

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...

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Similar questions

No load test was conducted on a three phase induction motor at different input voltages and the input power obtained was plotted against the input voltage. The intersection of the extrapolated curve on the Y-axis, would give (a) rated core loss (b) windage and friction loss (c) rated copper loss (d) rated core loss and windage and friction loss
Electrical Engineering Consider a balanced 3-phase current flowing into the stator of a 2-pole induction motor. What should be the current expressions for a clockwise rotation of the magnetic field? For wt = 10, 100,200,300 show that the rotating magnetic field is actually rotating clockwise using stator conductor
Q3) Mention Methods of starting of three phase induction motors and Single phase motors Discuss with Drawing only one of them ?
Q2 Complete the answer : The rotor reactance of the three phase induction motor is varies with ................... of the rotor current.
A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500-V(r.m.s.) at standstill between the slip-rings on open-circuit. Calculate the current and power factor at standstill when the rotor winding is joined to a star-connected external circuit, each phase of which has a resistance of 10 Q and an inductance of 0.04 H. The resistance per phase of the winding is 0.2 Q and its inductance is 0.04 H. Also, calculate the current and power factor when the slip-rings are short-circuited and the motor is running with a slip of 5 per cent. Assume flux remain constant.
Q2. A 230 V single-phase induction motor, 50 Hz, has the following winding impedances (at rest): Zm=28 <70° Q. Za=42 <45°Q A) Calculate the input current at start-up. B) Obtain the amount of capacitor in series with the auxiliary winding for which the torque Maximum startup. Then compare the input current, auxiliary winding current and torque all at start-up in two modes with and without starter capacitor.
The stator resistance of a 1-phase induction motor is 2.5 ohm and its leakage reactance is 2.0 ohm. Onno-load, the motor takes 4 A at 96 V and at 0.25 lagging power factor. The no-load friction andwindage loss is negligible. Under the blocked-rotor condition, the input power is 130 W at 6 A and42 V. obtain the equivalent circuit parameters.
With the aid of diagrams describe the basic topology of a wound field 3 phase synchronous generator and outline the relationship between the excitation voltage and rotor current. Q2 (a) (b) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) generator to a stand alone DC system. A star connected 3 phase wound field synchronous generator with a synchronous reactance of 20 N is connected to a 6.6 kV (phase voltage) grid and supplies 1.5 MW at 0.95 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8). (c) The load is now increased to 3 MW with the Excitation Voltage kept constant. Using the phasor diagram drawn in part (c) graphically determine the resultant phase current, power factor and load angle. (d)
short shunt compound generator delivers a load current of 10A at 200V and has a shunt field resistance 200 ohms. The shunt field current of 2A. Then armature delivers a current of a.10A b.8A c.11A d.12A
Q2. a) A 415V, 50Hz, 3-phase induction motor supplies its rated power to a load. The rated speed of the motor is 980 rpm. b) Two synchronous generators, G2 and G2, are connected parallelly supplying a load. Generator G1 has a no-load frequency of 50.5 Hz and a slope of 300 MW/Hz. Generator G2 has a no-load frequency of 50.2 Hz and a slope of 500 MW/Hz. The load consumes 250 MW real power. (i) At what frequency does this system operate, and how much power is supplied by each of the two generators? (ii) An additional 100 MW load is added to this power system. What is the new system frequency, and how much power do G1 and G2 supply? (iii) The governor set point of G2 is changed to control system frequency back to 50 Hz. Determine the G2 governor set point.
The armature of a 400V, 6-pole, 25 Hz single-phase series motor is lap-wounded with 504 conductors Motor field winding has effective resistance and leakage reactionance are 0.06 22 and 0.05 12, respectively and has 18 turns. However, the armature winding has a leakage reactance of 0.04 12 and negligible resistance. At rated motor current of 300A, the flux per pole is 0.05 Wb, the short circuit current is 50A and the equivalent current to iron losses is 40A. Find motor speed , torque and efficiency at rated current .
3. A 440V 60-hp six pole 60 hz A connected induction motor has the following parameters R1=0.048 R2= 0.035 Xm= 9.50 X1= 0.33 0 X2= 0.37 0 Pcore= 600W PF&W= 350W Use the Thevenin's Equivalent circuit concept to find: (a)Vth and Zth seen by the rotor circuit (b)The slip at which maximum torque occurs (c) the value of Max/pullout Torques (d) The starting torque.