Paper title: TRANSFORMER INRUSH CURRENT PREDETERMINATION FOR DISTORTED WAVEFORM VOLTAGE SUPPLY
Author(s): EMIL CAZACU, VALENTIN IONIŢĂ, LUCIAN PETRESCU,
Abstract: The magnetization current surged by a no-loaded power transformer at the connection
instant has extremely high values. These inrush currents generate a significant
electrodynamic and thermal stresses on the transformer windings and could determine
the faulty operation of the protecting equipment devices. Moreover, since the majority
of power distribution systems are affected by harmonic pollution, the applied voltage at
the energizing moment has a non-sinusoidal waveform. Thus, the paper presents a
predetermination of both the inrush current peak value and its harmonic spectrum under
a distorted supply voltage waveform. Starting from the transient state equations along
with a particular description of transformer core H-B nonlinear characteristic and core
stacking factor value, the inrush current time evolution is accurately predicted
Keywords: Transformer inrush current, Harmonic distortion, Magnetic core
characterization, Time domain analysis Year: 2013 | Tome: 58 | Issue: 3 | Pp.: 242-251
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