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Sub transient reactance X”d worshiper.
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Can high voltage dry type transformer winding be repaired without rewinding the whole transformer if it’s the very outer winding
Only the manufacturer can really answer that question properly.

On thing to have it repaired. Another thing to have it tested. And another thing to put in to service….

Like did it get dented and the varnish is scraped?

Or did it fail.?
 

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Sub transient reactance X”d worshiper.
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BS from someone that doesn’t know how to do it/

It depends on the extent of the damage: if it passes standard transformer tests a little epoxy to clean up the damage is all you need.

Rewinding is usually only done on very large or unusual transformers where lead time is an issue. Removing the varnish or epoxy means heating to 550-650 at for several hours to burn it off. You can’t realistically do a small area.
So, what part is BS?

Be specific….:

They are pretty general statements. So since your talking from a position of authority.

And let’s see. Once you modify/repair electrical equipment in Canada. It has to haRecertification Documentation. Depending on the provincial AHJ.

caution: bias sarcasm below…
I can go on but you should continue for me. Since you know from a position of authority.
 
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