Answer / sam

its Delta and star only

to provide electrical isolation

Answer / lvc babu

delata-star

Answer / ravi

IT IS DELTA-STAR ONLY.

TO PROVIDE SINGLE PHASE POWER SUPPLY i.e PHASE TO NETURAL
CONNECTION IT IS USED AS A DELTA-STAR TRANSFORMER.

Answer / mms

UPS OUTPUT FROM IGBT IS WITHOUT NUETRAL IT IS JUST PHASE
AND CUSTOMER REQUIRED PHASE AND NUTRAL FOR LOAD SO IN UPS
USE STAR OUT PUT TO THE LOAD HENCE THE USE "DELTA STAR"
TRANSFORMER USED IN UPS

FOR EXAMPLE IN SINGLE PHASE UPS OUTPUT(230VAC) WITHOUT
CONNECTING THE DEDICATED EARTH THIS TWO TERMINAL HAS OUTPUT
VOLTAGE FOUND 115 AND 115 VOLTS AND ALSO BOTH POINT TESTER
IS GLOWS THUS WE CONNECT THE EARTHING TO UPS

Answer / biswajit sahoo

deltastar, beacause neutral is dedicated for ups only. its
neutra is not mixing with raw power neutral

Answer / hussein

Delta-Star
reason: isolation transformer is to isolate the neutral.
However, the transformer input will be only 3 core cable
(RYB phases) which will be connected as delta, output will
be 4 cores (3 phases and one neutral) and clean earth which
will be commoned to neutral at the star point.

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