×
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

IEC 60909 VS IEC61363

IEC 60909 VS IEC61363

IEC 60909 VS IEC61363

(OP)
Hi
We are performing an IEC Fault calculation on the off shore installation. The switchboard rating is at offshore is 25kA for 1 sec which i assume is Ib(IEC60909).the calculation i am doing is IEC 61363. The result I am getting form the software is T0,T1,T2,T3 and T4 AC,DC and total. Now how I define (IEC61363) these results to the short circuit value stated at the nameplate of switchboard.
Thanks

RE: IEC 60909 VS IEC61363

I don’t know what could be the software you used to calculate.
There is a lot of such software. For instance:
http://www.digsilent.de/tl_files/digsilent/files/n...
These are not symbols used in IEC61363-1 [at least not in BS edition which I have] and there is not the usually output.
It is possible To...T4 are the location points where the short-circuit current is calculated as at transformer terminals, at generators terminals or at switchgear [breaker] terminals. Also AC could be the Iac(t) component and DC Idc(t) component.
However in ch.9 of the standard [nevertheless it is for low-voltage equipment] it is stated:
“The circuit-breaker’s rated short-circuit breaking capacity shall not be less than the calculated
prospective short-circuit breaking current. This value shall be obtained by calculating the a.c.
component of the short-circuit current Iac(t) at its point of installation on the system at the time
at which the circuit breaker’s contacts separate."
I think this time could be 100 msec [0.1 sec].
The short-circuit current withstand of 25 kA for 1 second it is referred to the thermal stability of the breaker [See IEC 60865-1 Short-circuit currents –Calculation of effects –ch.3.2.4.1]

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