Question { Siemens, 25567 }

On a transformer name plate %IZ(%Impedence) is mentioned.
What is the meaning of %IZ and how it is calculated?

Answer

rated full load current required to flow when the secondary
of transforme in short circuit condition..

Question { 7874 }

Why distribution transformer secondary voltage is 0.433kV
instead of 0.415kV.all other switchgear rating are 415
volt??

Answer

The distance between distribution transformer and switch
gear is slightly more,in that distance voltage drop is
occured
Some times in switch gear we need a single phase supply,
if it is 433 volt means, the phase voltage is 250 volt,in
case of 415 volt ,the phase voltage is 239 volt.