electrical power systems problem (OTA ID# 102922 )

see attached

Induction Motor question

A three phase Y-connected 480 V (line to line) 30 hp 60 Hz four pole induction motor has the following equivalent circuit constants in Ohms-per-phase referred to the stator: R1=0.21 R2= 0.20 X1=1.2 X2=1.1 Xp=39 The total friction windage and core losses may be assumed constant at 1340 Watts. The motor is connected directly to a 480 V source. Compute speed, shaft output torque in Nm, power in horsepower, efficiency, and terminal power factor for slips of 1, 2, and 3 %. If need be, please scan your handwritten solution and submit that so I can get an idea of the direction I need to go. Thanks,

Wound Rotor Induction Motor Question

A 100 hp 60 Hz six pole 460 V three phase wound rotor induction motor develops full-load torque at 1152 r/min with the rotor short-circuited. An external noninductive resistance of 1 Ohm is placed in series with each phase of the rotor, and the motor is observed to develop its rated torque at a speed of 1116 r/min. Calculate the resistance per phase of the original motor.

DC Series Motor Question

When operating from a 230 V dc supply, a dc series motor operates at 900 rounds per minute with a line current of 75 Amps. Its armature-circuit resistance is 0.13 Ohms, and its series-field resistance is 0.09 Ohms. Due to saturation effects, the flux at an armature current of 25A is 45 percent of that at an armature current of 75 Amps. Find the motor speed when the armature voltage is 230 V and the armature current is 25 A.

Phasor Diagram for Synchronous Generator

A 60-Hz 24-kV 250-MVA Y-Connected salient-pole synchronous generator (Xd=1.75 per unit, Xq=1.40 per unit) is operating with a phase-A to neutral voltage of 14 cos wt kV and a phase-A current of 5.75 cos wt kA; the currents and voltages are balanced three-phase. The rotor angle is known to be wt+37 degrees. a) Draw phasor diagram for this condition indicating the terminal voltage, armature current, location of direct and quadrature axes, and diret-and quadrature-axis components armature terminal voltage and current. b) Using the phasor diagram in part (a) calculate the magnitude of the direct-and quadrature-axis armature voltage and current. Even if it's hand written and scanned in ... click for more