In the short circuit test the secondary side of the transformer is shorted through an ammeter. The input voltage must be reduced to 10-15% of the open circuit / terminal voltage so that Isc ( short circuit current) does not exceed the rated current. The reading on the voltmeter is the Vsc. The no load current is approx. zero there fore Iin = I1, the input current is called Isc and can be measured using an ammeter. The reading in the wattmeter is the short circuit power Psc.
Using the values obtained in the in the experiment:
Psc/(Isc^2) = Rs or Req
Vsc/ Isc = Zs or Zeq
jXs = sqrt ( Zs^2 - Rs^2)
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