×
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

L.V Testing

L.V Testing

L.V Testing

(OP)
My question is this:

After finally pinning down the boss I've eventually convinced him we can have our equipment replaced!

We had a data logger record our equipment for one week (voltage, currents, KW, KVAr, KVA ect) and decided to use the data to compile a report to indicate the size required for install.

The question is about the current waveform results:
Do we use the maximum average RMS value (the peak amplitude value/true effective RMS) or the maximum max recorded value (the peak to peak RMS value) to size are equipment.
The equipment in question is our incoming breaker at the L.V switchboard.

I am as you can appreciate concerned about under sizing equipment due to fault or effectively over sizing and costing the company unnecessarily.

Many, many thanks in advance for your thoughts and suggestion on this!  
 

RE: L.V Testing

What is the reason for replacing your equipment? What type of equipment do you have in place now?

RE: L.V Testing

Hire an expert.
There is more to sizing equipment than you may suspect.
If you have to ask about RMS and peak to peak, you are probably not even aware of available fault current and short circuit withstand ratings.
How about PU impedance values of the supply transformer?
Hire an expert.
 

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: L.V Testing

For equipment sizing, nominal RMS value will be adequate.

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