Analysis of Transformer Inrush Current under Harmonic Source

Inrush current is an important issue for three-phase transformers security and stability. It has close relationship with flux variation of three-phase transformers. Harmonic effects in power systems have been significantly increasing in the last decade. It results in more complicated for investigating inrush current. In this paper, SIN^m(omegat) waveforms represent non-sinusoidal waveforms because studies on SIN^m(omegat) waveforms appear to be simpler for more predictable results. A flux analysis of three-phase transformer for inrush current is proposed in this paper. The results are very helpful to estimate harmonics effect for inrush current.