Thermal Short Circuit withstand of the Transformer Bushings

[iskar2000]

Thermal Short Circuit withstand of the Transformer Bushings
Hi all,
Please somebody to say me what is required by ANSY for choosing of the transformer bushings analogy to request in IEC137 the thermal current of the transformer bushing to be equal to rated current of the transformer bushing multiply by 25 and time for this thermal current to be 2sec.

 

[busbar]

Check info in:
IEEE C57.19.01
IEEE C57.19.00
And possibly:
IEEE C57.12.90
IEEE C57.12.10
IEEE C57.12.00

 

[iskar2000]

Thank you for reply
But my problem is that I have not these standards and cannot get them.
If somebody know exact request of the ANSI standards about thermal short-circuit current of bushings and How to choice the rated current of the bushings according request above and What is relation between rated bushing current and it's thermal current
10X
iskar2000@yahoo.com

 

[busbar]

Iskar, I do not mean to be rude, but if you are going to do work involving consensus standards, then their cost and availability have to be budgeted like other business expenses. Many IEEE documents are available from them electronically, but not without cost.

A mistake that could have been avoided by study and comprehension of a standard will almost certainly cost far more than a full library of related texts.