WHEN THESE TRANSFORMERS WINDINS CONFIGURATION ARE USED? SPECIALLY EXPLAIN REGAR

WHEN THESE TRANSFORMERS WINDINS CONFIGURATION ARE USED?
SPECIALLY EXPLAIN REGARDING STEP UP AND STEP DOWN KEEPING
IN MIND.AND REGARDING LOAD ALSO.
a.star to delta
b.delta to star
c.delta to delta
d.star to star

ALSO EXPLAIN WHY V USE 415/415 TRANSFORMERS IN TUBEWELLS?

Question Posted / raj

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WHEN THESE TRANSFORMERS WINDINS CONFIGURATION ARE USED? SPECIALLY EXPLAIN REGARDING STEP UP AND STE..

Answer / k.prakashchandra

Depending on application. 1:1 ratio tr is for isolation of
earthed neutral of primary.

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