Novel Technique to Compute the Leakage Reactance of Three-Phase Power Transformers


A practical and novel technique to compute the leakage reactance of step lap-core power transformers is presented. It will be applied to helical or continual disc windings. The developed technique is predicated on computing the magnetic flux lines created by each active conductor within the windings. Thus, the magnetic linkages are obtained by applying the concept of geometric mean distance of rectangular areas to the magnetic potential. The obtained analytical formulae enable straightforward calculation of the transformer reactance with higher accuracy than traditional ways currently used in the look of power transformers. Leakage reactance was computed for twelve power transformers with totally different coil configurations, and therefore the results were compared with results calculated from the short-circuit check. A difference of no over 3p.c was obtained between values measured with our proposed technique and values calculated with the short-circuit take a look at.

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