Forum » General Discussion » Where i can get the short circuit rating of the bus bar at different voltage level?
Topics: Where i can get the short circuit rating of the bus bar at different voltage level? on General Discussion
#1
Start by
Amol Shendge
01-09-2014 09:09 PM
Where i can get the short circuit rating of the bus bar at different voltage level?
Say for ex 415V-25kA, 240V-10kA. Is there any standard available for the same? Like to specify that I dont know the busbar size.
01-09-2014 11:12 PM
Top #2
Michael Novev
01-09-2014 11:12 PM
Bus bar short circuit rating is based on actual short circuit current. This results from the system impedance up to the point of installation. Standards can only give you the maximum possible at certain voltage level. However unless you calculate actual short circuit you will overrate your bus.
01-10-2014 01:45 AM
Top #3
Alan Maltz
01-10-2014 01:45 AM
Amol,
Your question is ambiguous. Are you looking for information on how to calculate the maximum short current a particular bus bar configuration can withstand without mechanically failing, or how to calculate the maximum short circuit current available from the grid and equipment attached to your bus bar. The calculations are entirely different, the former is a physical problem, the latter is an electrical problem.
Alan
01-10-2014 04:43 AM
Top #4
ABB PPMV
01-10-2014 04:43 AM
You can refer to ABB Switchgear manual, online version (switching to English language on this page: http://bit.ly/oitVS4)
01-10-2014 06:57 AM
Top #5
Wu Jun
01-10-2014 06:57 AM
i agree with Michael and Alan ,you should calculate the short current by system parameter ,such as impendence from system to local busbar ,local voltage .then you choose the busbar by the rated current .and then you check it with short circuit force.
01-10-2014 09:33 AM
Top #6
Norman Chambers
01-10-2014 09:33 AM
ABB PPMV please post another link i am unable to switch language.
