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Saturation curves of delta-connected transformers from measurements

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2 Author(s)
W. L. A. Neves ; Dept. of Electr. Eng., British Columbia Univ., Vancouver, BC, Canada ; H. W. Dommel

An algorithm is described for the computation of the saturation characteristics of three-phase delta-connected transformers from measured Vrms-Irms curves and no-load losses at rated frequency. For these transformers, positive sequence excitation tests are usually carried out with the delta connection closed. While triplen harmonic currents are present in the delta-connected windings, they do not appear in the line connections to the three-phase source. This paper presents an algorithm which accounts for the missing triplen harmonics on the line side in the derivation of the saturation characteristics

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IEEE Transactions on Power Delivery  (Volume:10 ,  Issue: 3 )