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well explained infomation about SF6 and Vacuum circuit breakers.

There is a sort of myth that micro hydro electricity is unreliable and low quality. What do you think?

Good text! I would be good if you could write about some project where IEC 61850 was implemented. Thank you.

After few years and bad or non-at-all inspections ANY oil transformer can became unstable in work or show some more or less serious problems.

Of course it has a lot with transformer state. What problems did you have with ABB'S transformers? You didn't mention rated primary voltage.