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SINCE one of the important features of a transformer is its series or leakage impedance, improvements in the calculation of this quantity are always searched for. In power transformers this impedance is almost all formed by its reactive component so that the accuracy of the impedance calculation hinges on the accuracy of the leakage reactance calculation. Modern methods of calculation using digital computers have been adopted so that very accurate reactance calculations can be made whenever they may be required in the design of a particular transformer. The use of a digital computer makes this calculation quick, easy, and painless, and permits a major improvement in this phase of transformer design.