What will be the effect of field current changes on the synchronous motor?

The power of motor will vary only when the torque of the load shaft varied. So the field current has zero effect of speed of rotation of a shaft, as the load connected with shaft of motor is constant so active power provided by the motor will also remain constant.

What is phase sequence in synchronous generator?

Phase Sequence The phase sequence (or phase rotation) of the three phases of the generator must be the same as the phase sequence of the three phases of the electrical system (Grid). The only time that the phase sequence could be wrong is at initial installation or after maintenance.

When the field of a synchronous motor is under excited the power factor will be?

When the synchronous machine is operating as an under-excited motor, it has a lagging power factor due to a low field current.

What is field current in synchronous generator?

Synchronous machines are AC machines that have a field circuit supplied by an external DC source. In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. Field windings are the windings producing the main magnetic field (rotor windings for synchronous machines).

What is correct phase sequence?

Phase Sequence This sequence of phase shifts has a definite order. For clockwise rotation of the shaft, the order is 1-2-3 (winding 1 peak first, them winding 2, then winding 3). This order keeps repeating itself as long as we continue to rotate the alternator’s shaft. Clockwise rotation phase sequence: 1-2-3.

How do you find the phase sequence of a generator?

The meter terminals are marked with a certain phase sequence order. Once the disk rotates, the direction of the arrow on the disk shows the phase sequence, based on the marks. The tool rotates clockwise when the phase sequence is correct (RYB) and anticlockwise when the phases are reversed.

What is the correct phase sequence?

REVIEW: Phase rotation, or phase sequence, is the order in which the voltage waveforms of a polyphase AC source reach their respective peaks. For a three-phase system, there are only two possible phase sequences: 1-2-3 and 3-2-1, corresponding to the two possible directions of alternator rotation.