×
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

Steam turbine control issue

Steam turbine control issue

Steam turbine control issue

(OP)
On site , a CCPP with a steam turbine Franco Tossi Mechanica and Siemens ORSI IT control system we experience lateley the following event: WHile ST runs her start up sequence the speed is controlled by HP Stop (throttle) valve). After the spped of 2800 rpm the conmtrol of spped goes to HP Control valve (governor)> But for some reaosn at the stage of 2990 rpm the speed of ST decreases to 2900 rpm becasue the control goes back to the HP stop valve. This happens one or two times and then the unit sunchronizes OK. Can you share any experience on this issue?

RE: Steam turbine control issue

I have no knowledge of Siemens controls, however that sounds like a problem I've seen on another type unit.  The "FA/PA transfer" circuit used position indications to verify the CV went to the transfer position.  this was either via limit switches which were a real problem to set and get repeatable.  the latter electronic position switches (VCs) were much better.

the problem was that the circuit could not determine if the transfer was from "SV high transfer" to CVs or the "CVs low transferr" back to SVs.

Thus I would look for position logic as the problem

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