What is non isolation transformer?

I also have the same question. After some research, I understand that you cant just jump in and calculate this. You have to have alot of information about that spesific generator.

I have found out that you can use some formulas from losses in transfomers.

All mutual Transformers are isolation transformers in the sense that the secondary winding is electrically-isolated from the primary winding. However, this is not the case for an autotransformer where part of the winding is common to both primary and secondary circuits.

So, to answer your question, an autotransformer is a 'non-isolation' transformer, although the term 'non-isolation' is not normally used.

Read more: How_do_we_calculate_Power_generator_losses