TY - JOUR AU - Pjevalica, Nebojsa AU - Petrovic, Nenad AU - Pjevalica, Velibor AU - Teslic, Nikola PY - 2016/04/05 Y2 - 2024/03/28 TI - Experimental Detection of Transformer Excitation Asymmetry through the Analysis of the Magnetizing Current Harmonic Content JF - Elektronika ir Elektrotechnika JA - ELEKTRON ELEKTROTECH VL - 22 IS - 2 SE - DO - 10.5755/j01.eie.22.2.14590 UR - https://eejournal.ktu.lt/index.php/elt/article/view/14590 SP - 43-48 AB - <p>The presence of a low DC voltage in a power grid produces an excitation asymmetry for the distribution transformers, resulting in unwanted half-cycle saturation that may impair transformer safety, reliability and efficiency, especially in increasing the reactive power, stray losses and iron losses. This paper highlights a diagnostic method based on the phase value of the particular even harmonics of a transformer excitation current as the basic marker of an excitation asymmetry. In order to achieve a straightforward insight into the nature of even harmonics behaviour, a novel method of decomposition an excitation current waveform into its unhysteretic (pure magnetization) and hysteretic components has been included in the harmonic analysis.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.eie.22.2.14590">http://dx.doi.org/10.5755/j01.eie.22.2.14590</a></p> ER -