GSU Transformer Upgrade – Tank Hot Spot - Summary

Significant localized tank cover flange heating had been observed by infrared scan on a 185 MVA GSU transformer, compromising the aimed upgrading (by 23%) of the name plate MVA rating.

The enhanced oil cooling could not cope with the localized tank hot spot. The simulation provided a good match with the measured tank temperatures.

Additional studies allowed the verification of alternative designs for the LV busbars enclosure. Thanks to the simulations the proper solution was identified!

Description