A No Load test conducted on a 3-phase star connected induction motor resulted ina per phase power of 20 W with a phase current of 2 A at a phase voltage of 110V.Determine the following:Q4(a)(i)The iron core resistance (R.)(ii)The magnetising reactance (Xm)(iii)The no-load power factorA 50 Hz, star-connected, 6-pole induction motor operating from a 230V supply,where 220V is the phase voltage Vph. The parameters of the per phase equivalentcircuit are given in Table Q4. Assuming that the friction and windage losses areequal to 260W, determine the following for a slip of 0.04:(b)(i)The stator current (A)(ii)The electrical input power (A)(iii)The rotor current (A)(iv)The mechanical output power (W)(v)The motor torque (N.m)(vi)The motor efficiency (%)ParameterValueХм40ΩR,1.20R,0.82XeqReTable Q4bA star connected 3-phase wound field synchronous generator with asynchronous reactance Xs of 140 is connected to a 20kV (line) grid andsupplies 2MW at 0.871 lagging power factor at its terminals. Determine thefollowing:(c)(i)The phase current.(ii)The resultant voltage Vxs across the synchronous reactance.The required excitation voltage (Eph).(iii)(iv)The load angle (8).

As per the guidelines it is instructed to do first question when multiple questions are posted.…

A No Load test conducted on a 3-phase star connected induction motor resulted in a per phase power of 20 W with a phase current of 2 A at a phase voltage of 110V. Determine the following: 4 (a) (i) The iron core resistance (R.) (ii) The magnetising reactance (Xm) (iii) The no-load power factor

A No Load test conducted on a 3-phase star connected induction motor resulted in a per phase power of 20 W with a phase current of 2 A at a phase voltage of 110V. Determine the following: 4 (a) (i) The iron core resistance (R.) (ii) The magnetising reactance (Xm) (iii) The no-load power factor

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

Similar questions

The reactance’s of the alternator during the periods of the subtransient, transient and steady state periods are following, Leakage reactance(XL)=0.16 ohm, Damper winding reactance(XD)= 0.28 ohm Field winding reactance(Xf)=0.41 ohm and Armature reactance (Xm)= 0.74 ohm. The value of the steady state reactance during the steady state condition is Steady state Reactance Answer
explain the phasor diagram of slip phase induction motor
23. As load is increased from no load to full load on a 3-phase squirrel-cage induction motor, what happens to the ..
A 1200 kVA, 6600 volts, three-phase wye connected alternator, has an effectiveresistance of 2.5 ohms and a reactance of 12 ohms per phase. Determine the inducedemf and the torque developed by the armature when fully loaded at 0.8 leading power factor.
Discuss the behaviour of an induction motor when it is rotating at synchronous speed.
None
Vi Q1) A 220 V, Four pole, 50 Hz Single phase induction motor hasy an actual impedances of Z1 = 1.86 +j 2.56, and Z2 = 3.56 +1 2.567 and total rotational losses (Pfe+ Pfw) of 62 W Find the motor Efficiency at Slip of (5%) Note Zf = 12.4 +j 17.15, Zb= 0.84 +j 1.26 Draw the equivalent circuit with the parameters? Solution: Rr ملاحظة: 72 تهمل لان الدائرة المكافئة لا تحتوي على Z2. 71=1.86 + 32.56.52 17 f = 12.4 +3 17.15 2 : Zb=0.84 + J 1.26 Zt 15.1 + j 20. 97 25.84 154.24.52 I in Put= 220 25-84 = 8.51 A 12= 733.31 1094.09 *100 = in Put Power = 220 * 8.51 * cos 54.24 1094.09 W iPd = 8.51² (12.4 -0.84) (1-0.05) = 795.31 w W out Put Power = 795.32-62 733.31 W 67.02% X1 = roo ea Xm xm R₂ R₂
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)
A three-phase star-connected alternator working at 1400 KVA,50 Hz, 2300 V, has an armature dc resistance of 0.15 2. Assume the ac resistance is 1.4 times the dc resistance. A field current of 75 A produces a short circuit current of 360 A and for the same field current the open circuit voltage is 1000 V. Determine a) Synchronous reactance of the machine b) Full load regulation at 0.9 leading c) Power angle a) b)
h has rotor e.m.f. Speed of the induction motor and the frequency of its [970 r.p.m.; 1.5 Hz] 4. 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 2 and an inductance of 0.04 H. The resistance per phase of the rotor winding is 0.2 2 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 the flux to remain constant. [10.67 A; 0.376; 21.95 A; 0.303] 5. Obtain an expression for the condition of maximum torque of an induction motor. Sketch the torque- slip curves for several values of rotor circuit resistance and indicate the condition for maximum torque to be obtained at starting. If the motor has a rotor resistance of…
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 .