Converter Transformer Load Losses - Summary

Locally the LV-winding had very high losses, causing conductors to overheat with consequent turn to turn failure. Because of the small amount of cellulose being degraded, the Dissolved Gas Analyses (DGA) may not alert the end user about the imminent failure.

The simulation provided an excellent match with the observed failure (burnt paper at middle axial height of LV-winding). It allowed the OEM to understand the nature of the failure and take proper corrective actions.
If the simulation had been used to validate the original design, the failure would have not occurred!

Description