Previous in Forum: Wind Turbine   Next in Forum: Motor Current
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
ASHOK TAKALI
Active Contributor

Join Date: Nov 2011
Posts: 11

Power Factor Formula

06/24/2013 3:17 AM

As i know power factor formula = kwh/kvah = active/reactive power.

But Ethiopian Electricity Board calculate power factor as following

PF = Cos (Inv.tan (Reactive/Active)).

Kindly reply with full details.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Power Factor formula

06/24/2013 4:03 AM

They are two expressions of the same thing.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Power Factor formula

06/24/2013 2:31 PM

Full details lie within these and About 5,600,000 additional results that can be obtained by searching,

Power Factor Formulas Equations - RF Café

Calculating Power Factor - Orange & Rockland Utilities

How to Calculate Power Factor Correction: 8 Steps - wikiHow

Power factor and general power system analysis equations ... - NEPSI
Register to Reply
7anoter4
Guru

Join Date: Oct 2012
Location: 100 miles North from the World Center
Posts: 879
Good Answers: 42
#3

Re: Power Factor Formula

06/25/2013 9:59 AM

If we shall measure the voltage and the current with an oscilloscope we shall get a curve representing voltage and current wave and we shall see an angle between these two curves. cosinus of this angle-fi=(volt,current)- will be the p.f.[power factor]=cos(fi).

kwh=active ENERGY [measured by kwh meter (monitor) and not by wattmeter!]

kVArh=reactive energy[could be measured on a kVArh monitor]

kVAh=apparent ENERGY[usually it is not measured]

kwh=Volt*Current*cos(volt,current)*hour [for a steady-state load]

kvarh=Volt*Current*sin(volt,current)*hour

kVArh/kwh[reactive energy/active energy]= Volt*Current*sin(volt,current)*hour/Volt*Current*cos(volt,current)*hour=

sin(fi)/cos(fi)=tan(fi).

arctan(fi)=Inv.tan =fi. That means p.f.=cos(fi)=cos[Inv.tan(reactive energy/active energy)]

__________________
 Julius
Register to Reply
ddung
Participant

Join Date: Sep 2009
Location: HN, VN
Posts: 4
#4

Re: Power Factor Formula

06/26/2013 5:30 AM

The first Equation power factor formula = kwh/kvah = active/apparent power
Register to Reply Off Topic (Score 5)
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

7anoter4 (1); ddung (1); lyn (1); PWSlack (1)

Previous in Forum: Wind Turbine   Next in Forum: Motor Current

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (96 right now)
Show Members
Advertisement