Table of Contents
- 1 On which factor synchronous speed depends on?
- 2 What is phase angle generator?
- 3 What affects the speed of synchronous motor?
- 4 What factors determine number of poles of a synchronous motor?
- 5 How are power factor and power angle related?
- 6 At what power angle a synchronous generator will develop maximum power?
On which factor synchronous speed depends on?
frequency
The speed of a synchronous motor is dependent on the frequency of the power source and the number of poles the stator has. RPM increases directly with frequency and inversely as the number of poles.
What is phase angle generator?
Phase Angle As previously mentioned, the phase angle between the voltage produced by the generator and the voltage produced by the grid must be zero. The phase angle (0 to 360°) can be readily observed by comparing the simultaneous occurrence of the peaks or zero crossings of the sinusoidal waveforms.
What is the power factor of synchronous generator?
The power factor rating of most synchronous generators is typically between 0.8 lagging to 0.95 lagging. By convention, a synchronous generator operating with a lagging power factor is producing vars, while one operating with a leading power factor is consuming vars.
What is the power angle in a synchronous generator?
Power angle can also be defined in terms of armature or stator mmf and resultant air gap mmf. In a synchronous generator, the stator mmf lags behind the resultant air gap mmf. This angle of lag is called load or power angle.
What affects the speed of synchronous motor?
f is the frequency of the generated voltage in hertz. thus, The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. Actual speed of the induction motor will be less than the synchronous speed.
What factors determine number of poles of a synchronous motor?
As in synchronous motor, rotor and stator are synced with each other and the rotor rotates with the same speed as the rate of change in rotating flux in the stator. In this equation, P is the number of poles of stator and f is the frequency of the voltage signal applied for excitation of the stator.
How does power factor affect generator?
When the power factor of the generator is lower than the rated value, the rotor temperature will increase due to the increase of the rotor current. At this time, the load should be adjusted to reduce the output of the generator. If more reactive power the generator set generates, the smaller the power factor will be.
At what power angle does a synchronous generator develop maximum power?
90°
Explanation: Maximum excitation power occurs at 90° and maximum power due to reluctance occurs at 45°. Therefore, the maximum power developed in salient pole synchronous machine occurs at a load angle less than 90°.
This therefore gives us: Power Factor = Real Power/Apparent Power, or p.f. = W/VA. Then the cosine of the resulting angle between the current and voltage is the power factor.