_{2} is used to fill the breather which turns pink when it absorbs moisture . When fried again it gets its original form by removing its moisture contents.

_{2}) flows through the secondary winding a counterbalancing current (I_{1}^{,}) is induced on the primary winding varying inversely to their respective turns . The total primary current on load (I_{1}) is equal to the vector sum of the primary counterbalancing current (I_{1}) and the no load current (I_{0}) which will be approximately equal to (I_{1}^{,}) as I_{0} is practically very small.

_{1}^{,} =r_{1}+ (N_{1}/N_{2})^{2} r_{2}

Equivalent reactance referred to primary _{1}^{,} =X_{1} + (N_{1}/N_{2} )^{2} x_{2}

Equivalent resistance referred to secondary_{2}^{,} = r_{2} + (N_{2}/N_{1} )^{2} r_{1}

Equivalent reactance referred to secondary _{2}^{,} = x_{2}+(N_{2}/N_{1} )^{2} x_{1}

Where, r_{1} and r_{2} are the primary and secondary resistances respectively. And x_{1} and x_{2} are the primary and secondary reactances respectively. N_{1} and N_{2} are the primary and secondary turns respectively.