PF Correction Capacitor Requirement

Volts and amps, for at least two.

Yep. Power factor correction equipment suppliers can answer this question over the telephone.

Thank you very much Mr. Dhayanandhan.

We do not have any Capacitor Bank installed at present. In this case how can we assess the kVAr requirement?

Thank You!!

It's already there. Simply, the reactive power must be less than 39.1% of the active power to achieve 0.92. Since the volts and amps in the circuit have not been shared with the forum in response to #1 above, it is not possible to proceed any further here.

How did the phone calls to PFC equipment suppliers go, please?

The supply voltage is 415V and the current per phase is 160A.

The PFC equipment manufacturers are suggesting a 50 kVAr capacitor bank to increase the p.f. from 0.76 to 0.92.

You can use a Power Factor Meter and measure the P.F.

With out capacitor, How did you come to know, the PF initially 0.78 and you wanted to improve. to 0.92. Actually I wanted to raise a question, as 1.What is the KVA, 2. What is the Line Current etc.

But for improving the PF simply in terms of Percentage HOW MUCH extra KVAR is required can be calculated, based on the basic equation KVA = Sq.Root of KW^2 + KVAR^2 and

POWER = Sq.Root 3 x V X I x Cos(Fhi)

This FORUM is a PRESTEGIOUS FORUM, where working difficulties are posted seeking advise or asking Members to share their experience.

Since your question is simple one, I answered.

DHAYANANDHAN.S

I got to know the value of p.f from the electricity bill we get every month.

The supply voltage is 415V at 50 Hz and the line current is 160A per phase.

PFC equipment person is suggesting a 50 kVAr capacitor bank to increase the p.f from 0.76 to 0.92.

for actual calculation you need to give the details of the load. the PFC equipment person recommendation is correct. To fine tune the number of steps required for the bank operation, a break down of the connected load is essential. Your total consumed load as per the current usage of 160A is around 90 KW. What are these 90 KW is made up of ?

As per the best practice, the capacitor bank of 50 kVAr recommended by them, will have 6 steps. First two steps will be 5 kVAr each, and the remaining four steps with 10 kVAr each. For a better tuned steps use the following combination of 6 capacitor steps

2, 3, 5, 10, 10 & 20 kVAr steps. Your actual load details can give you the actual combination of capacitor kVAr

Power factor correction is one of CR4's more popular topics, with much covered before now. Futher insight on it may be obtained by entering the topic into the Search this Forum box on the right, and clicking on the Go button to obtain some bedtime reading.

Thank You!!

Hope I'll get the answer to my question from the previous posts.

"kVAr Calculator" this app is available for IPhone/IPAD,Android and Windows Phones .Try this app ,you get complete details.

Simple Table

To get the rating of the capacitor bank required to correct a load of 100 kW from 0.67 to 0.95 lag

From above table the Multiplying Factor = 0.779

Total Capacitor bank rating = 0.779 X 100

= 77.9 kVAR for 3 Phases.

Thanks..