Answer Posted / suchit kumar sau

bushing is an insulator which protects the transformer tank
from being connected with live suppy terminals.generally
made of porcelin,having conductor rod through the channel
inside it and also having a current transformer
arrangement.oil is filled between the connecting rod and
inner cylindrical surface of porcelin cylinder. the
porcelin cylinder has a petty coat shape to protect this
unit in rainy days. In a word, bushing is a protecting
insulator which protect the tf from flashing over.

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