Power Transformer LTR

[mersin33]

I would really appreciate any help regarding the limited time rating of a 250MVA, 230/115kV for overload periods of 15 minutes, 10 days and continuous. Any reference, link, suggestion would be extremely helpful.

I am also looking for info regarding the LTR of ACSR conductor. It seems like everybody is recommending to use ACSS/TW for elevated temperatures. Any experience with elevated operating temperatures on ACSRs? (115&230kV Transmission lines).

Regards,

saltan

 

[jghrist]

ANSI/IEEE C57.91-1995, "IEEE Guide for Loading Mineral-Oil-Immersed Transformers"

IEEE std 738-1993, "IEEE Standard for Calculating the Current-Temperature of Bare Overhead Conductors"

 

[RRaghunath]

there is iec too on overloading of transformers, it is iec 60356 (if my memory serves me right)