Answer Posted / engr. l. o. osuji

Hi Paliwalsureshi,
Makers of such transformers usually provide a tertiary
winding connected in delta. This winding is sometimes called
compensating winding. As others have rightly said this
winding help to eliminate the harmoics which may interfer
with communication in power system. Before the advent of
microprocessor-based differential relays the old
differential scheme with star-star on one must have a delta
winging in between.In a nutshell any star-star connection
must have a delta tertiary.

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