×
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

Prime Mover input versus Generator output

Prime Mover input versus Generator output

Prime Mover input versus Generator output

(OP)
I was hoping someone could set me straight and maybe point me to some helpful technical papers or documents relating to prime mover input as a function of generator output. What I am really looking to find out is does a unit's prime mover input increase (connected to synchronous generator) as a function of real power (kw) or apparent power (kVA)? I am familiar with varying field current to adjust power factor and I'm curious if load on the prime mover also increases when generating further VARS (keeping KW constant).

RE: Prime Mover input versus Generator output

Real power (kW) and mechanical power (HP) follow each other. The kvars do not affect the HPs in the first approximation. But there may be some extra losses in the windings of the generator when the power factor is low (high on vars) and that may show up as a slight increase in HPs.

Gunnar Englund
www.gke.org

RE: Prime Mover input versus Generator output

Kilowatts output of the generator, plus the losses of the generator equals input power to the generator.
Output power of the prime mover (net power) plus the losses of the prime mover equals the gross power of the prime mover.
The losses of the generator are mostly related to the current.
With a poor power factor, the current for the same kilowatt output will be higher, hence the slightly higher losses with poor power factor, as mentioned by skogsgurra.
respectfully

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