Power factor

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#1 21662790 25 Jun 2012 12:07

ASAD ALI ASAD ALI

Anonymous

Post #1
21662790 25 Jun 2012 12:07

Can any one please guide me when we have a general load e.g a building load let says 100Kw then it is not possible for us to calculate a one general power factor because we have different type of load so how can we calculate existing power factor??? so that we can
calculate target power factor in order to design capacitor bank..
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#2 21662791 26 Jun 2012 05:16

David Adams David Adams

Anonymous

Post #2
21662791 26 Jun 2012 05:16

you need to measure the power consumed with a power meter then measure line voltage and current, then caculate power factor by PF = Watts / (Volt * Amps). If three phase power then PF = Watts / (1.732*Volts*Current)
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#3 21662792 27 Jun 2012 00:35

ASAD ALI ASAD ALI

Anonymous

Post #3
21662792 27 Jun 2012 00:35

But if we are on the design stage means we are just designing and estimation the site so how can we calculate the capacitor bank let we have total 1000KW load for one building???
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#4 21662793 27 Jun 2012 10:23

David Adams David Adams

Anonymous

Post #4
21662793 27 Jun 2012 10:23

YOU CAN'T UNLESS YOU KNOW ALL THE LOADS. THAT IS WHY MOST LARGE MACHINES HAVE THEIR OWN CORRECTING CAPACITOR BANKS OR YOU GET ONE FOR EACH SPECIFIC MACHINE YOU INSTALL - SO BEST BET IS TO INSTALL AS YOU GO ALONG
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#5 21662794 28 Jun 2012 07:47

ASAD ALI ASAD ALI

Anonymous

Post #5
21662794 28 Jun 2012 07:47

Sir i have one drawing of 10 floors building and need to make a quotation for electrical switch gear . i have only details let suppose total number of 13 A switch socket outlet say 600, lights 1000, motors, lifts A.Cs water heaters and rest of the things now i don't know what will be run on the 13A sockets and i have total 500KW load and i am on the design stage help me how can i calculate the capacitor bank for this building????
#6 21662795 29 Jun 2012 05:21

Rahul M Rahul M

Anonymous

Post #6
21662795 29 Jun 2012 05:21

I am not sure about the importance of calculating power factor in this case as most of the connected loads are inductive. Here i think for 100Kw connected load you may need like 25 KVAR capacitors, and in capacitor bank you can divide them like three 5kvar, two 3 kvar, two 2 kvar and one 1 kvar capacitors.
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