7. The synchronous reactance of a three-phase synchronous motor is 8 per phase,

Question

7. The synchronous reactance of a three-phase synchronous motor is 8 per phase, and the armature resistance is negligible. The input power is 1000 kW, and the excitation voltage is 4600 volts rms. If the terminal voltage of the motor is 4160 volts rms, determine: a) The power angle b) The armature current c) The power factor d) Given that this is a four pole motor and a stroboscope is used to measure the retardation angle from no load to full load. The angle is found to be 10°. What is the electrical angle?

Explanation / Answer

Electrical Angle = (Poles/2) * Mechanical Angle

= (4/2) * 10 degrees

= 20 degrees (ANSWER)

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