Power factor

Hi,

Technical and Economics point of view UNITY P.F. is desired but Inductive Circuit recoiling as Generator is disastrous.

You can improve PF till 0.95 0r so with Economics well justified, beyond it is expensive.

Kishore is correct. Above 0.95 there is little gain in efficiency for the large expense needed. The risks of resonance also increase because if the load is reduced, you might go leading. In leading mode, you tend to resonate with the distribution line. The more leading you are, the lower the resonance frequency and the higher the risks that it will happen.

This is why any power factor correction needs some controller that will disconnect the capacitor bank when we lose the load and will let the inrush transient die before re-energising it.

PF of unity makes system prone to resonance.

He may be sceptic but he is correct and gets a point from me.

At Unity powerfactor, the inductive load = capacitive load

ie wL = 1/wC

Now for the frequency, the circuit will resonate and can you see what will happen to the system ? the resistances most likely will not be able to damp it out and bang poof the whole thing goes off.