up to what level we can improve the power factor of induction motor?

Question

in my plant there is a induction motor having rating 3Ph,50hz,3.3kv,610kw. It takes input power 588kw,it is operated at 0.946 Pf& at that time conected capacitor is 202kvar up to what level i can further improve its pf safely? tell me rating of capacitor?

Answer 1

At a PF of .946 any further shift towards unity could cause you a lot to probs.... due to ferro-resonance. I would be very careful in adding any more capacitors.
The old adage. "If it ain't broke, don't fix it"
Source: Electrical Engineer with 40 + years experience

Answer 2

Actually Max has mis-interpreted the question. A synchronous condenser is a synchonous motor operating on no load..... The questioner was asking whether a synchonous motor can be used to improve the PF. So the answer is a definite yes over or under exciting a synchronous motor ie a synchronous motor driving a load such as a fan/compressor/pump etc. can bring the PF back to unity. Definition: over exciting the motor is raising the excitation volts above the line volts Under exciting the motor is reducing the excitation volts to below the line volts.... Source: Electrical Engineer with 50 years experience

Answer 3

Maybe you need to know the value of the induction motor in Henry's or mHenry's, then work out the 'tuning' from the standard resonant frequency formula of
f = 1/ (2pi([root]LC)
and transpose that to get C when you know L and 'f'
.
I would guess the maximum efficiency is when the whole unit is tuned to 50Hz

Below is a link to a formula calculator when you know the inductance of the motor.

Answer 4

Sorry I can't give you the specs, but I'm sure you could get the power factor to unity with the right capacitors, or as near as damn it. Of course, to keep the power factor at unity, you'd need a supply voltage kept very stable, something that's not easy to do!

Answer 5

Warp Factor 10. After that, the ship will disintegrate.