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Given primary voltage = 69 kV ; secondary voltage = 12.47 kV
secondary current = 1296.447 A ; Calculate primary current

Vp

Vs
=
Is

Ip




Vp

Vs
=
Is

Ip

In a no loss , ideal transformer , 100% efficient power transfer

power generated in primary winding = power generated in secondary winding

Formula recall of power,
P = I V

Power Primary winding
= Ip Vp

Power Secondary winding
= Is Vs

IpVp = Is Vs

By algebraic manipulation.

Vp / Vs = Is / Ip



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