×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Electrical power factor correction

Electrical power factor correction

Electrical power factor correction

(OP)
Power factor= kW/kVA, in the 3phase system kW=kW1+kW2+kW3. but how to measure kVA ?? Is it kVA1+kVA2+kVA3 or sqrt(kW^2+kVAr^2)??

RE: Electrical power factor correction

according to me taranath ,
your second opyion is a better proposition as  kva or apparent power has the same definition .
if its a balanced 3 phase supply with balanced load ,
single phase calculation is enough  for getting idea about the required kva .
kva =sqrt(kw^2 + kvar^2)
eply about your idea .\this is prasanth

RE: Electrical power factor correction

KVA = kVA1+kVA2+kVA3?  Yes - as long as you treat KVA as a complex quantity (magnitude and phase).

KVA = sqrt(kW^2+kVAr^2)?  Yes.

RE: Electrical power factor correction

Suggestion: Reference:
1. IEEE Std 100-2000 The Authoritative Dictionary of IEEE Standards Terms, Seventh Edition, 2000.
The Power Factor (PF) is defined per phase: i.e.
Fp=sum(watts per phase)/sum(RMS voltampere per phase)=ActivePower/ApparentPower
If the voltages and currents are sinusoidal and, for polyphase circuits, form symmetrical sets, Fp=cos(alfa-beta).
The definition posted in the original posting for three phase systems is not included in Reference 1.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources