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What type of isolation transformer used in UPS's??
It's Star-Delata Or Delata-Star????Why it is used????
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Answer Posted / 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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