Off Load Tap changer generator Step-up Transformer, My question is, is safe to

Off Load Tap changer generator Step-up Transformer, My
question is, is safe to operate the tap say I want to
change the tap position from 3 to 4, there is not load on
the transformer but a 22000v 0r 1100 v is present on the
secondary side from the common Bus *22000V/415 v

Question Posted / crihata

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Off Load Tap changer generator Step-up Transformer, My question is, is safe to operate the tap say..

Answer / chaitanya

off load tap changer is not only on no load on transformer
but transformer should be de-enrgised condition i.e.
voltage on supply side should be cut-off. This is due to
off-load tap changer is not designed to change the tap when
on voltage energisation.

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