Respected sir's, Please clear my doubts? How to calculate the "short time current rating"(i.e-primary short time current rating-like if u take 400-400/5-15va/class1,40ka/3sec). 40ka/3sec-how to calculate this rating from the substation? Is there any formula?please advise me... ...

What is the difference between short circuit making current and short circuit breaking current of switch-gears? Is short circuit making current and short circuit making capacity same?

Good day all I have a three-winding power transformer with vector grouping of YNyd11. I also have the utility short-circuit currents at the primary and secondary wingdings, and the primary-secondary, primary-tertiary, and secondary-tertiary positive and zero sequence impedances. I must calculate...

How do we calculate short circuit current in dc system?

Hi, For ring-type (window-type) CT, do we need to size the CT short time withstand current at the same or above the system short time withstand current (short circuit level)? Any reference/technical explanation? Thanks!