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ABSTRACT
The currently used three—phase models [1-3] of transformers with delta—connected windings may lead to three—phase fundamental and harmonic bus admittance matrices of power systems with singularity, which may result in incorrect results or inability to carry out three—phase fundamental and / or harmonic load flow solutions. In order to solve this problem, this paper presents a modified model to keep the admittance matrices from singularity. Several samples and actual systems have proved the correctness and efficiency of the proposed model.