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.

in thermal power plant the steam produced is made to cool after falling on the turbine blades. my question is why this is done while the same is needed to heat up again. "jab pani ko wapis garam hi karna hai to thanda kyu karte hai"

11 Answers   Bhel,

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why DC current not used in Transformer action?

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why and where we use early make & late break contacts in protection?

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What is an automatic controller?

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9 Answers  

A genarator is connected through a 20MVA ,13.8/138 KV stepdown transformer to a transmission line. at the reciving end of the line a load is supplied through a step down transformer of 10MVA,138/69 KV rating .A 0.72 PU load evaluated on load side transformer ratings as base values ,is supplied from the above system for system base values of 10 MVA and 69 KV in load circuit the value of the load in generator circuit will be ...........

1 Answers  

Why the transformer rating is denoted in VA rating why not in KW

7 Answers