Mitigation of Switching Transient in Transformer
Sagar Devidas Bole

Sagar Devidas Bole, Research scholar, Department of Electrical engg., Govt. college of engg. Amravati Maharashtra, India.
Manuscript received on October 09, 2013. | Revised Manuscript Received on October 21, 2013. | Manuscript published on October 20, 2013. | PP: 51-53 | Volume-1, Issue-11, October 2013. | Retrieval Number: K03431011113/2013©BEIESP
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Abstract: an inrush current is a transient current with high amplitude that may occurs when a transformer is energized under no load or lightly loaded conditions. The magnitude of inrush current may be as high as several times of transformer rated current. The magnitude of inrush current depends upon leakage reactance, source strength, impendence of winding, residual flux. Inrush current causes huge mechanical and thermal stress on transformer in addition to inadvertent operation of the protective relay systems. The conventional method like pre-insertion of resistor, point on wave is used to minimize the inrush current. Inrush current in transformer can be reduced by selecting appropriate switching angle with respect to the remnant flux. In this paper dynamic modeling of transformer is used for detailed analysis of the inrush current and the effect of switching angle on the magnitude of inrush current is observed.
Keywords: Dynamic modeling, switching transient.