×
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

Series inductor with drive question

Series inductor with drive question

Series inductor with drive question

(OP)
I have a piece of equipment that essentially IR heat lamps driven by SCR's. In series with the equipment on the main incoming power feed (480v, 400 amp) is a .054mH inductor with 15 kvar  delta caps on each side configured as in a pi filter. If my calculation came out right this is set up for the 25th harmonic. What is the purpose of this circuit??

RE: Series inductor with drive question

Suggestion: Visit
http://www.rficorp.com/Filtchar.pdf
http://www.rficorp.com/tubulars.htm
for:
A Pi filter is usually the best choice when high levels of attenuation are required and where input and output impedances are similar values.  It should not be used with switching circuits.

The PI filter will attenuate the higher frequency that might cause EMI interference.

RE: Series inductor with drive question


Without some in-service field measurements, it’s a bit hard to make a concrete statement.  

Are there any as-built drawings / design calculations / operating history as evidence?  Is their some aspect of operation that is unacceptable or suspect?  
  
15KVAC on a 400-ampere circuit seems kind of "dainty".  
  

RE: Series inductor with drive question

(OP)
Sorry for the delay, I was out. I talked to the new equipment manufacturer who acquired the design from the original manufacturer and did not get much out of them other than "because I said so". My real question is does this filter help me in any way other than RF mitigation. Does it help with transients/spikes to the equipment/ harmonic mitigation ( I have 5th banks at the unit sub)etc..

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