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2012 (Vol. 4, Issue: 05)
Article Information:

Assessment of Inrush Current for Power Transformers by Three-Dimensional Representation

Mohammad Yazdani-Asrami, Arjang Yousefi-Talouki and Mohammad Mirzaie
Corresponding Author:  Mohammad Yazdani-Asrami 

Key words:  Hysteresis flux, inrush current, power transformer, switching angle, , ,
Vol. 4 , (05): 533-538
Submitted Accepted Published
2011 December, 30 2012 January, 31 2012 March, 01

For power transformers, the magnitude of the first peak of inrush current is ten times more than the rated load current. The main feature of this current is its high amplitude and second harmonic content. An uncontrolled inrush current may lead to the inadvertent operation of the circuit over-current protection systems. Furthermore, the magnetic stress produced by the inrush current may destroy mechanical structure and windings of transformers. In addition, this current has undesirable effects on electricity quality, extra loss, and reduction of useful life of transformer. In this paper, the peak value of inrush current in three-phase power transformer with Y-Y connection has been calculated and shown with a three-dimensional representation and its harmonic spectrum has been evaluated. It should be mentioned that, this phenomenon occurs because in four-wire Y-Y connection three-phase power transformers, the probability of saturation in phases is lower in contrast with other possible connection of three-phase transformers.
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  Cite this Reference:
Mohammad Yazdani-Asrami, Arjang Yousefi-Talouki and Mohammad Mirzaie, 2012. Assessment of Inrush Current for Power Transformers by Three-Dimensional Representation.  Research Journal of Applied Sciences, Engineering and Technology, 4(05): 533-538.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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