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Power Factor – The Basics

What is Power Factor?

Super. Iâ€™m ready to find out what power factor is. To understand power factor, weâ€™ll first start with the definition of some basic terms:

To understand power factor, weâ€™ll first start with the definition of some basic terms:

• KW is Working Power (also called Actual Power or Active Power or Real Power).
It is the power that actually powers the equipment and performs useful work.
• KVAR is Reactive Power.
It is the power that magnetic equipment (transformer, motor and relay) needs to produce the magnetizing flux. KVA is Apparent Power. It is the â€śvectorial summationâ€ť of KVAR and KW.
Letâ€™s look at a simple analogy in order to better understand these termsâ€¦. Letâ€™s say you are at the ballpark and it is a really hot day. You order up a mug of your favorite brewsky. The thirst-quenching portion of your beer is represented by KW (Figure 1). Unfortunately, life isnâ€™t perfect. Along with your ale comes a little bit of foam. (And letâ€™s face itâ€¦that foam just doesnâ€™t quench your thirst.) This foam is represented by KVAR.

The total contents of your mug, KVA, is this summation of KW (the beer) and KVAR (the foam).

So, now that we understand some basic terms, we are ready to learn about power factor!

 Title: Power Factor – The Basics Format: PDF Size: 0.2MB Pages: 13 Download: Right here | Video Courses | Membership | Download Updates

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Jun 14, 2019

The unit of reactive power and reactive energy is in var, kvar, Mvar, … y varh, kvarh, Mvarh.

References, IEC 60027-1 (â€śLetter symbols to be used in electrical technologyâ€ť).
IEEE 519 (â€śRecommended practices and requirements for harmonic control in Electrical Power Systemsâ€ť).

2. M. Saleh
Oct 16, 2018

Sirs,
What is the difference between cosine and power factor ?

3. Dang Luan
Jun 02, 2016

Loss reduction = 1- (0.65^2/1^2) ?, who explain?

4. Khaled
Apr 11, 2016

Dears,
Thank you for the great guide, but may be there is a mistake in the example (page 10), the load is a fan with 250 HP, with PF of 65%

Then it was given that KVA is 250, KW is 163, how come?

ain’t 1 HP = 746 watt ???

5. HARIHARAN
Jan 29, 2014

KVA=KW+KVAR IS THIS CORRECT??

• jim
Nov 12, 2015

nope. KVA = sqaure root of (KW)^2 + (KVAR)^2

• Kebier Mohammed
May 05, 2017

In vector form this is correct.

6. Pankajjyoti
Jul 23, 2013

Sir, this site is very much helpful for students. But there is no technical articles related to Power electronics or Control System (except automation part).It will be a great thing if the above topics are also added

7. mpriya
Feb 28, 2013

Hi Can you please forward me the 13 pages of the power factor,because I am been blocked from our administrator.

Thank you

8. [email protected]
Jan 31, 2013

Power Factor â€“ The Basics

Hi Can you please forward me the 13 pages of the power factor,because I am been blocked from our administrator.

Thank you