kartracer087
Electrical
- Apr 18, 2020
- 64
For a power transformer that is built to IEC standards say 132kV to 11kV and 40 or 50MVA top rating what is the maximum percent impedance? Is it possible to build a transformer that has roughly 30-35% impedance at the top rating? I know in US I’ve heard figures as high as 20% are possible at the self cooled rating which is usually 3/5 of the force cooled rating. So hypothetically a 30/50 MVA unit could have as high as 33.3% at the ONAF rating of 50MVA. Is this consistent with IEC maximums?