Capacitor sizing for power factor correction

Commonly method for power factor correction using the capacitor to generate reactive power ( kVAR ) to reduce apparent power ( kVA ) form inductive load.

This time i want share a simple method to sizing our capacitor to improve power factor for induction motor and utility electricity.This method also can use for capacitor bank sizing.

Power factor correction is the one of famous topic for all electrical person at around the world.Many discussion and debate about how to sizing the capacitor for power factor correction.

How to sizing capacitor for power factor correction?

To properly sizing the amount of capacitor (kVAR) required to correct the lagging power factor,we  must have three (3)  important of information below:

  • kW (kilowatts)
  • Existing Power Factor ( % )
  • Desired Power Factor ( % )

From this information,now we can calculate the capacitor size for power factor correction.The formula to calculate the required kVAR is:

Factor from Table 1 below x kW = kVAR of capacitors required.

Calculation Example :

1 unit air-compressor ( 3 phase 415 VAC ) used an average of 90 kW with an existing power factor of 80%.The desired power factor is 95%. The factor value for this case is 0.421 to raise the power factor from 80% to 95% using table 1.

0.421 x 90 kW = 38 kVAR

So we need capacitor size 38 kVAR to get power factor 95% for 1 unit air-compressor 90 kW.

If working power (kW) or Present Power Factor are not known you can calculate from the following formulas to get the three basic pieces of information required to calculate kVAR.The best range for  desired power factor is around 95% until 100%.

 

Comments

  1. haitham hashim says:

    If I had known this site earlier when she entered the Faculty of Electrical Engineering, read the threads started by Mr. Admin and I become a better engineer, thank you, Mr. Adam

  2. Are pf and efficiency of motors given nameplate of all motors?.
    If no-load current is known(given in nameplate) can we estimate the size of capacitor required a) to start the motor (by reducing starting current)
    b) to correct pf?.

  3. Hi
    Nice explanation
    There is something similar explained for capacitor sizing

  4. hello, nice article!!! I am really impressed. Actually this is my first time reading your post. But I am very fascinated by the way you explained this simple method in sizing up a to improve power factor for induction motor and utility electricity. Thanks for sharing this information. Really good. I will be subscribing to your feed. Rest assured that I will read your future posts..

  5. BHARGAV says:

    dear sir,
    thanks for reply
    if i have a only motors HP ratting, then how i can know require KVA of capacitor??
    thanking yoy

    • no problem bro,
      do you mean for power factor correction for induction motor?
      follow this step :-
      1) Convert hp to kW;formula : 1 hp = 0.746 kW
      2) from kW,you convert to Ampere;formula : I = kW / volt x 1.73
      3) from ampere you can find the kVAR for power factor capacitor..for more detail please read my post about capacitor sizing for power factor.

  6. Great website. Lots of useful info here.
    I’m sending it to a few friends ans also sharing in delicious.
    And naturally, thank you to your effort!

  7. Some of the camps are held at the Extension Office, while others are
    held in local parks or specialized craft stores. It provides the children the required skills for turning into a well behaved and
    disciplined adult. There are various sports activities at the camp
    such as base ball, table tennis and other games. Fried potatoes
    were also served and occasionally a sweetbread topped
    with icing and cinnamon found its way to the table.

    Foods like broccoli and asparagus, a lot of pasta for those trying to gain weight and a lot of salad for those trying to cut down.
    There is a ritual each recruit participates in called the pickup.
    However for now ‘ let’s think about what it’s like to be an athlete often confronted
    with these questions with no-one nearby offering support.
    In all likelihood, there will be plenty of other people who
    are just getting back into fitness themselves.
    The learned to work as a team as well as overcome fears.
    Ask for a photocopy of any policies that the camp has in result,
    and be sure and keep that copy safe to refer back to.
    summer youth boca raton recently posted..summer youth boca ratonMy Profile

  8. In December 2012, she was half way through her reconstructive procedure and
    has since become a symbol of hope for women suppressed by the Taliban, urging women to “never give up and don’t lose hope,” that “what happened, it’s part of me, part of my life and its all the time in my mind and with me. In 2009, men undergoing some sort of cosmetic surgery procedure rose eight percent. The various types of plastic surgery on the face are:.

  9. How many ways are there of going green in beauty schools.
    The kitchen and bathroom are the places that we hang out in, at the
    end of a hard day. Sometimes whenever a Berkeley plumbing predicament
    happens, people make an effort to fix the plumbing Berkeley problems with no help.
    noland plumbing pompano beach recently posted..noland plumbing pompano beachMy Profile

  10. Additionally, if anything happens to the home while the builder
    is leasing it, they will fix it. They will have to allow grasses to naturally rest in winter, become dormant and yellow, and golfers will have to
    accept that their pristine green all year round
    courses, are going to change. Do you want a much larger nicer house for your family.
    The following will outline some great places to get leads and give you some tips to help you along the
    way. The best gutter guard would last your customer more than twenty years.
    Specifications and tenders in advance of works are not necessary to support the estimates or allowances
    included in budgets. In all of the above cases, if an agreement
    cannot be reached between the parties as to the value attributable in the respective transaction then either party is at
    liberty to appeal to the Leasehold Valuation Tribunal, which
    is an independent legal body that can settle certain types of leasehold
    dispute without the need to go to court. Actually,
    they are not as complicated as it may seem. The chemical
    cocktail-injected into the ground can lead to water and soil contamination and in many
    states, including California, disclosure of chemicals is not required.
    You can informally negotiate buying the freehold rights to
    your property with the freeholder or can buy the freehold via enfranchisement.
    1031 exchange intermediary fees recently posted..1031 exchange intermediary feesMy Profile

  11. Advanced Plastic Surgery is here to celebrate beauty with its state of the art facilities and innovative services such as dermabrasion,
    BOTOX Cosmetic, body surgeries, and the latest Vi – Peel.
    And a proficient plastic surgeon with a lot of experience, can take that even further.
    The couple broke up in 1937 as Lamarr finally escaped to London by drugging him.
    facial plastic surgeon ohio recently posted..facial plastic surgeon ohioMy Profile

Trackbacks

  1. [...] motor to reduce FLA..I used simple power factor calculation for electric motor from this post : sizing for capacitor power factor & power factor capacitor [...]

  2. [...] to excellent.How we measure the electrical efficiency?The answer is power factor.I discussed about how to sizing capacitor for  power factor correction on my last [...]

Speak Your Mind

*

CommentLuv badge