Answer / sai

we can use the Requird rated capacitors while we can
mainten the pf

Answer / abdul wajid

Power factor in industries can be improved by using
capacitor banks

Answer / pillay

The PF is low because of inductive load. You can improve IT by adding capacitive load. Luckily cap load is loss free.That means you dont pay kwh for it but you must buy and maintain the capacitor and on and off it as necessary at the right amount.
One way to know how much you need, is you must know the load in KW and the pf.
assuming the load is 500 kw and the PF is 0.6 and you want to improve it to 0.95. you can find out the kva demands at this two pf levels
500/0.6=833kva . 500/0.95=526 kva, 833 kva -526kva =307kva

If you add 307kvar into the system in paralel you would improve the pf to 0.95 you can divide this into 8 steps of 40 KVAR each connected accros the 3 phases through an auto PF regulator.Your cap on each step will be rated as 40 kvar at 415 volts (rated voltage) 3 PHASE.

I welcome any improvements or comment about this.

Answer / amit biswas

inddustries mostly use static variable compensation (SVC)
technique for pf improvment.

Nowwhy dose pf drops? Due to inductive loads(eg.due to
arcing furnaces)

what SVC scheme dose is it proptionatly increases
captcitacne with inc. inductance or vice versa.

also using syc. motors can improve pf
(remember sync. motor is also called sync. condensor)

Answer / edy

Let say the load 500kw and u wanna increase ur power factor
from 0.6 to 0.95

500 (Tan 1-Tan 2)-u can use complex calculator to convert
from cos to tan
500 (1.33-0.32)
505kvar

u can set it with 6 step
505/6
84kvar and make it 80kvar each step

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

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