A Three-Phase transformer has a total series impedance of 0.01+j0.05 pu. The total impedance of the magnetization part of the transformer is very big and can be ignored in the modeling. The transformer delivers a load with 1.0 pu active power at unity power factor. If the voltage at the load terminals is 1.0 pu, what will be the voltage at the source side of the transformer?

The  value is  

Explanation:

From the question we are told that

 The  series impedance is  

 The active power is

 The voltage at the load terminal is  

Generally the voltage at the source side of the transformer at the source side of the transformer is mathematically represented as

Here I is the current through the load which is mathematically represented as

Here is the power factor which is mathematically represented as

So  

So

explanation:

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