IEC 60909 VS IEC61363 1

[SRA007]

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

 

[7anoter4]

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/news/IEC61363_TechnicalReference.pdf

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]