Starting current of synchronous motor circuit is 2 to 5 times than that of normal current
How many times the normal current draws at the first start of the synchronous motor circuit?
A three phase induction motor draws a starting current which is five times the full load current with direct on line starting, while developing twice the full load torque. Q2.1. Based on the two facts that starting current is proportional to the applied voltage and that the starting torque is proportional to the square of the applied voltage, determine voltage (as a per cent of rated voltage) required to obtain a starting torque equalling the full load torque. (10 marks)...
a. The figure below is a set of Synchronous Generator and Synchronous Motor. The ratings of the machines are as follows: Synchronous Generator:. 3ph, 1.0MVA, 2.3kV, 50Hz, 0.85 lagging power factor, X.=0.9 pu Synchronous Motor: 3ph, 0.5 MVA, 2.36V, 50Hz, 0.85 leading power factor, X.=0.8 pu Synchronous generator Synchronous motor The generator is equipped with a voltage regulator which maintains the terminal voltage at the rated value. The motor delivers 500 hp and it field current is adjusted to make...
A motor is connected to a 12-V battery and draws a 2.0 A current. a) How much power is delivered to the motor? b) How much energy is converted if the motor runs for 5 minutes?
A single phase motor draws a current of 30 A from a 240 V, 60 Hz. line. Refer to Problem Description 7.2. A capacitor with a reactance of 31 Ω is then connected in parallel with the motor. A Wattmeter connected to the circuit gives a reading of 5.4 kW. How much reactive power does the capacitor deliver? How much net reactive power remains in the circuit? How much apparent power does the circuit now consume? What is the power...
An electric motor on an airplane operates on 400V volts and draws a current of 300 amperes. (a) What is the power consumption of the motor in Watt? (b) How much energy does the motor use during a 2 hour flight in Watt-hour? c) If you use cells with 4V and 20Amp-hour capacity, how many cells do you need to construct the battery pack for the electric plane? d) How many of cells must be connected in series to provide...
2. (30) The starter motor of a car engine draws a current of 150 A from the battery. The copper wire to the starts motor is 5.0 mm in diameter and 1.2 m long. The starter motor runs for 0.80 s until the car engine (a) What is the drift velocity of the electrons in the current? (b) What is the voltage across the wire? motor while it starts? (c) How many electrons travel through the starter
please show all work An electric motor draws a current of 15 amps in a 240 volt circuit. What is the power of this motor? 360 W 3600W 2760 W 3000 W
Q3) A 400-V, 3-phase, 50-HZ, 4-pole Y-connected synchronous machine is operated as a motor and draws 27A at 0.77 PF leading. The motor armature resistance is 0.50/Phase and synchronous reactance is j12Ω /phase. The rotational loss is 200 watts. The field winding has a resistance of 0.4Ω and is supplied by 50V DC sources. Determine the following: a) Real and reactive power drawn by the motor b) The power developed c) The torque angle d) The shaft torque e) Efficiency...
A three-phase, Y-connected, 6.9-kV, 8-pole, 60-Hz, synchronous motor has a synchronous impedance of 0.01+j6 Ω/phase. The motor is energized at its rated voltage and frequency, and draws a line current of 100 A. The motor rotates a load, while operating at a lagging power factor of 0.9. Calculate the torque developed by the motor: (a) considering the armature resistance (b) neglecting the armature resistance
A 2200Vrms (line-to-line), 30Hz, Y-connected, 3-phase synchronous motor has a synchronous reactance of 10Ω per phase. The motor draws 163kW at a power angle of 15°. Determine: a) The excitation voltage per phase. b) The supply current and the supply power factor. c) Draw the phasor diagram for the above condition. d) Suppose the mechanical load is now disconnected, with all the losses are negligible. Determine the new supply current and the supply power factor.