×
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

What is the difference between Damping reactor & harmoincs reactor

What is the difference between Damping reactor & harmoincs reactor

What is the difference between Damping reactor & harmoincs reactor

(OP)
Hello Everybody,


I'm asking about the different between using current limiting reactors & harmonics reactor in a new 3.4MVAR & 6.8MVAR capacitor banks installation in a 33KV network for a 25MVA arc furnace  

i had been informed from the supplier this reply here below

" Current limiting reactors are used only for switching transients of capacitor banks and they do not have  effect on harmonics.
 
But harmonic filter reactors are capable to do for both transients and harmonic filtering. It protects capacitors against bad effects(life time, blowing etc..) of harmonics.
 
If you compare the prices also, harmonic filtering reactors are approximately 30 times more expensive than current limiting reactor!"

can you please help me understanding that & give me your comments about that

RE: What is the difference between Damping reactor & harmoincs reactor

is the current limiting reactor you are talking about a neutral to ground reactor to limit the fault current?

RE: What is the difference between Damping reactor & harmoincs reactor

Switching capacitors in a capacitor bank means that you switch devices with different voltage and near-zero impedance and that causes very high transient currents to flow.
Those high currents reduce breaker's life considerably, sometimes also cause the contacts to weld. The current limiting reactor reduces current peak, mostly by reducing the di/dt and needn't have a high L value - usually a few uH is enough.

Harmonics filter reactors are used to move the resonant frequency of transformer leakage inductance plus capacitors down below the harmonics frequencies (usually below third harmonic) and they are a lot bigger than the current limiting reactor. That size difference is reflected in the corresponding price difference.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: What is the difference between Damping reactor & harmoincs reactor

Filter reactors are basically shunt reactors. They are connected in series with a capacitor to create a low impedance path to ground for certain frequencies. A current limiting reactor is connected in series and therefore cannot shunt any harmonics.

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