Does power factor vary with speed?If yes, how?If not, why?
- 4 Answers
- 6384 Views
- Genco, I also Faced
- E-Mail Answers
Answer Posted / sivakumar cv
First we need to understand that what are the way the speed of an AC motor can be changed.
only two way either by changing the no of pole or by frequency.For a given machine only option available is changing the frequency.
Now the next question is which factor determine the power factor.
It is the amount of magnetizing current which determine the powerfactor of the machine at a particular load.So magnetizing current is controlled by adjusting the machine reluctance.
The Only variable which affects the reactance of the machine is frequency of the supply for given machine (Sice the geometry of the machine is invariable).
So if there is any change in speed by adjusting the frequency of the supply definitely there would be change in powerfactor of the machine for a given load.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
how to calculate singlephase motor efficiency?
What are the types of windings according to the construction?
why transformer ratings in kva? & DG ratings in kva? & Motor ratings in kw/HP?
A power transformer 4MVA/11KV/0.415Kv has been out of use in 12years. what maintenance actions/test need to be carried out before energizing.
Give some example of fault limiting devices?
What is EHT tariff or Power factor Tariff ????
How to decide the size of the capacitor for a single phase induction motor say 2 HP ??
what is the difference between surge protection capacitor and surge arrestor
What is Control & Relay Panel? And Remote Control Center?
Tell me all plants load factors i.e which plant operating on which load?
is there any current and voltage drop on liquid resistance starter water/soda tank ?
Is it possible to measure correct value of earth resistance & cable insulation ristance with out disconncting earth lead & both sides of cable ends? If not, any other method to measure ER & CIR with out disconneting from the system.
what is high - pot test. what's its use?????
Why do we mostly prefer to generate and distribute electricity in 3 phase and not in 4 phase or 5 phase?
why Current is lead 90 degree and voltage is lag 90 degree in a capacitor.? why Current is lag 90 degree and voltage is lead 90 degree in an inductor.?
