i heard that power factor(PF) is the main concern for
industries, if they are maintaining PF around 0.6 they will
be fined for that. now the question is, how can they improve
the PF ranging between 0.9 to 0.95 which is safe for them
i,e escaping from the fine?
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Answer / sai
we can use the Requird rated capacitors while we can
mainten the pf
| Is This Answer Correct ? | 10 Yes | 1 No |
Answer / abdul wajid
Power factor in industries can be improved by using
capacitor banks
| Is This Answer Correct ? | 3 Yes | 0 No |
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.
| Is This Answer Correct ? | 3 Yes | 0 No |
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)
| Is This Answer Correct ? | 2 Yes | 2 No |
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
| Is This Answer Correct ? | 0 Yes | 0 No |
WHEN TWO ALTERNATORS ARE OPERATING IN PARALLEL, EXPLAIN WHY IT IS OBJECTIONABLE TO OPERATE ONE AT A LEADING POWER FACTOR AND ONE AT THE Lagging power factor?
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