How to calculate % Impedence?

Answer Posted / salahudeen

itis the ratio of for a given supply voltage the full load
current flowing though the secondary wdg when secondary is
short circuited.

EXAMPLE Given 100v the current is 5 A then 100/5=20

then pERcent=0.02

why this value?

it ios a crucial factor determining the current carrying
capacity of the protection/switch gear of the transformer
N/w

ie suppose rated current is 7 A then switvh gear capacity
=7+0.02(7)=7.15 A

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