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Power Factor Formulas


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#1 SoyEli

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Posted 29 March 2007 - 02:48 PM

Hi !
I'm new here "GREATE FORUM"
Had 4 ?'s

1 In power factor formulas, why is everything in 1000's like Kvar, Kvolts etc. ?
2 What is the deference between a "Kvar" cap and a regular motor run cap ?
3 In the Capacitor Kvar formula, Is the Kvolts the cap rating ? or the power source ?
4 Where can I get a Kvar capacitor ?


Thanks smile.gif

#2 marke

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Posted 29 March 2007 - 06:23 PM

Hello SoyEli

Welcome to the forum.

Re your questions.
1.
QUOTE
In power factor formulas, why is everything in 1000's like Kvar, Kvolts etc. ?

The voltage is usually in volts (not KVolts) and the current in amps, but usually the sizing is quite large and it is more convenient to consider KW and KVAR. - keeps the numbers smaller.
Power factor is only applied in industrial applications and motors are rated in KW or HP. motors rated in watts would not be corrected.

2.
QUOTE
What is the deference between a "Kvar" cap and a regular motor run cap ?

Motor RUN capacitors are single phase and applied to single phase motors only. Power factor correction capacitors are generally three phase but could be made up of three motor run cap-acitors although the rating and voltage would be low.

3.
QUOTE
In the Capacitor Kvar formula, Is the Kvolts the cap rating ? or the power source ?

The voltage is the voltage of the supply, but I would check the KVolt part as most formula are for volts, not KVolts.

4.
QUOTE
Where can I get a Kvar capacitor ?

Most suppliers of motor control equipment can supply power factor correction capacitors.

Best regards,

#3 SoyEli

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Posted 29 March 2007 - 07:14 PM

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