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gsenthil1970
Participant

Join Date: Sep 2009
Location: india
Posts: 1

Power Factor

09/21/2009 7:49 AM

Hi
The trans former Details given below is Connected for this transformer how to calculate the capacitor rating in idel condition
already we connected 10 KVAr capacitor for compensation of power factor but the power factor is fluctuating to 0.5 to 0.93
Transformer Rating - 500KVA
Volts HV/LV - 11000/433 V
Current HV/LV - 26.24/666.69 A
Vector group DYN-11

TestMeasured ValuesCalculated ValuesGuranted Values
No-Load Loss800 Watts at 433 Volts800 W1000.00 Watts
Mag.Current6.25 Amps at 433 Volts0.90%3.00%
Load Loss4800 Watts at 26.24 Amps @ 75 Deg C5561 W6000.00 Watts
Impedence540 Volts at 26.24 Amps @ 75 Deg C4.94%4.50% to 5.50%

please give me the suggestion for improve the power factor and calculating method,formula
Thanking you
Regards
G.Senthilkumar

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PWSlack
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#1

Re: Power Factor

09/21/2009 9:46 AM

[Comment withdrawn at first edit.]

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wareagle
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Location: Alabama
Posts: 1604
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#2

Re: Power Factor

09/21/2009 11:48 AM

Power Factor is determined by the load. In order to calculate the capacitor ratings you must determine the load PF. Then the capacitor rating to correct to the required PF can be calculated.
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DRK
Active Contributor

Join Date: Jul 2009
Posts: 17
#3

Re: Power Factor

09/22/2009 1:50 AM

Hi,

Wareagle has rightly indicated.

maximum banefit of capacitors derived by locating them as close as possible to load. At this location, kvars are confirmed to the smallest possible segment,decreasing the load current.

For capacitor sizing kvar rating = kw(tanφ1 - tanφ2)
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