A full voltage of 410V/230V for single phase and three phase system with equivalentimpedance of 0.02+j0.03 ohms/phase is supplying a 40HP, 410V induction motor. Byconsidering motor's NEMA code letter is D and locked-rotor power factor of 0.40 lagging,(c)(i) Calculate the locked-rotor kVA and locked-rotor current during starting.(ii) Identify the active power (P) and reactive power (Q).(iii) Obtain voltage at motor terminal (Vm).(iv) Calculate the percentage voltage drop (%Vdrop) during starting.(v) Compare result in Q2(c)(iv) by using approximation method.

We are authorized to answer three subparts at a time, since you have not mentioned which part you…

A full voltage of 410V/230V for single phase and three phase system with equivalent impedance of 0.02+j0.03 ohms/phase is supplying a 40HP, 410V induction motor. By considering motor's NEMA code letter is D and locked-rotor power factor of 0.40 lagging, (i) Calculate the locked-rotor kVA and locked-rotor current during starting. (ii) Identify the active power (P) and reactive power (Q).

A full voltage of 410V/230V for single phase and three phase system with equivalent impedance of 0.02+j0.03 ohms/phase is supplying a 40HP, 410V induction motor. By considering motor's NEMA code letter is D and locked-rotor power factor of 0.40 lagging, (i) Calculate the locked-rotor kVA and locked-rotor current during starting. (ii) Identify the active power (P) and reactive power (Q).

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

A three phase, 4 pole, 3300 V, 50 Hz, star connected Induction motor, has identical primary and referred secondary impedance of value 3+j9 Ohm per phase. Using the approximate circuit, calculate: A. The full load torque at rated slip of 5%. B. The maximum torque at normal voltage and frequency.
A 25 HP, 6 pole, 50 Hz, 3-phase slip ring induction motor runs at 960revolutions per minute on full load with a rotor current per phase of 35 A.Allowing 250 W for the copper loss in the short-circuiting gear, and 1000Wfor mechanical losses, find the resistance per phase of the three-phaserotor winding.
The primary leakage impedance and equivalent secondary impedance referred to stator atstandstill of a 3-phase, 220 V, 50-Hz, 4-pole induction motor are (0.4 + 3j)ohms and (1.2 + j1) ohms per phaserespectively. If the magnetizing current is neglected, determine the maximum torque the motor candevelop and slip at which it occurs.
A gas turbine, 2-pole, 3? synchronous generator rated at 200 MW is connected to the grid (presumed to be an infinite bus). The electrical operating frequency of the grid is 60 Hz, and the slope of the frequency-power curve for the generator is 15 MW/Hz. a. If the no-load setpoint for the generator is set to 63.5 Hz, how much active power will the generator provide to the grid? b. Neglecting system losses, what is the torque provided by the gas turbine? c. What would happen if the no-load setpoint for the generator is set to 59 Hz?
The full-load slip of 4-pole,60Hz,440v (line -to-line) three phase induction motor is 0.05. i.What is the speed of the rotating stator field?What is the frequencey (in Hz) of the rotor current. ii.When the output power of the motor is 90 hp at a speed of 1732rpm,rotational losses(which includes frictional and core losses) are 10,100W,while copper losses for both rotor and stator total 3700W.Determine the motor efficiency and line current,assuming the motor has a 0.8 pf lagging under these conditions.
Using the 2 different 'single phase equivalent circuits' given below, the desired equations will be deducted. Equations separately for asynchronous motor powered by voltage source will be removed and the spaces given below will be written. You can also do your inference work. show it and deliver it. V1 and I1 are the RMS value of the AC phase voltage and current. All formulas (3 phase motor) will be written as a function of motor parameters and slip.
The full load slip of a 4-pole, 60Hz, 440V (line-to-line) three phase induction motor is 0.05. (i). What is the speed of the rotating stating? What is the frequency (in Hz) of the rotor current? (ii). When the output power of the motor is 90 hp at a speed of 1732 rmp, rotational losses (which include frictional and core losses) are 10,100W, while copper losses for both the rotor and stator total 3700W. Determine the motor efficiency and line current, assuming the motor has a 0.8pf lagging under the conditions.
A 70-MVA, 69.3-kV, three-phase round-rotor synchronous generator has a synchronous reactance of 14 ohm per phase and negligible armature resistance. 1) The generator is delivering rated power at 0.87 power factor lagging at the rated terminal voltage to an infinite bus bar (Fig. 1). Determine the magnitude of the generated emf per phase and the power angle δ. 2) The generator is delivering 53.5 MW to the bus bar at the rated voltage with its field current adjusted for a generated emf of 46 kV per phase. Determine the armature current and the power factor. Is the power factor is lagging or leading? 3) Given that the generator is operating at the excitation voltage of Part (1), determine the maximum steady-state power which the machine can deliver without losing synchronism. Find the armature current corresponding to this maximum power.
EMachines A 100 MVA, 11.5 kV 0.8 pf lagging 50-Hz two pole Y-connected synchronous generator has a per-unitsynchronous reactance of 0.8 and per-unit armature resistance of 0.012. A. What is its synchronous reactance and armature resistance in ohms?B. What is the magnitude of the internal generated voltage at the rated conditions? What is its torque angleat these conditions?C. Ignoring losses in this generator, what torque must be applied to its shaft by the prime mover at fullload?
A 60 MVA, 69.3kV, three-phase synchronous generator has a synchronous reactance of 15 ohms/phase and negligible armature resistance. The generator is delivering rated power at 0.8 power factor lagging at the rated terminal voltage to an infinite bus bar. What is the maximum three-phase power that can be generator can deliver before losing its synchronism?
A 4-pole, 3-phase, 50Hz induction motor has a voltage between slip-rings on open circuit of 520V. The star connected rotor has a standstill reactance and resistance of 2.0 and 0.4 Ω per phase respectively. Determine: (a) The full-load torque if full load speed is 1,425 rpm(b) The ratio of starting torque to full-load torque(c) The additional rotor resistance required to give maximum torque at standstill.
A delta connected 1185 V, 50 Hz three phase induction motor has a star-connected slip-ring rotor with a phase transformation ratio of 4. 2. The per phase rotor resistance and standstill leakage reactance are 0.0627 ohm and 0.049 ohm respectively. Assuming the stator impedance and magnetizing current are neglected. Calculate the the following, (i) The rotor current at starting with slip-rings are short circuited. (ii) The rotor power factor at starting with slip-rings are short circuited.