u/Abhyuday_Power

Recently completed energization of a setup involving:

• 8 MVA Power Transformer (66/11 kV, ONAN/ONAF)
• 8 MVA Inverter Duty Transformer (11/0.8–0.8 kV)

Both are oil-filled and used in an industrial + utility-side application.

A few things that stood out during execution:

• Inverter duty side needed careful handling of harmonics and thermal behavior
• Insulation reliability becomes critical for long-term performance
• Core loss optimization still plays a big role even in such setups
• Short-circuit withstand considerations during design were important

System has been running stable post-charging so far.

Curious from others working in similar environments:

- What are the most common issues you’ve seen in inverter duty transformers over time?
Especially under variable load conditions (like solar or industrial applications)