Answer Posted / sareer ahmad lone

Star connection is that connection from where we can take
the neutral point.If you take three coils in a transformer
similar ends are joined together to form a common point
which is called a neutral.We can earth the neutral point.
Normally for bigger transformers like 66kV or more the
connection is star/delta,and the cost is less because the
higher the voltage the more the insulation you have to
use,so if you use a star primary you can degrade the
insulation towards the neutral point,then using less
insulation.Hope the answer is correct

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