Abstract

A power transformer, when energized at no-load, may have transient currents up to 100 times that of the steady state magnetizing current. This inrush current has several detrimental effects on power quality and may damage sensitive equipment connected to the system. In this paper, a power electronic based control circuit is developed, which estimates the last remnant and, utilizing this data, it controls the next re-energization instant to achieve inrush free switching. An equivalent circuit model of a transformer is also presented to simulate the transient dynamic performance of a transformer for any arbitrary switching operation.

Submitted: February 5, 2008 · Accepted: August 10, 2008 · Published: March 10, 2009

Recommended Citation

Das, Sharmili; Prasad, Dinkar; Bhattacharya, Tapas Kumar; and SenGupta, S. (2009) "Magnetizing Switching Inrush: Estimation and a Novel Circuitry for Inrush Elimination," International Journal of Emerging Electric Power Systems: Vol. 10 : Iss. 1, Article 1.
DOI: 10.2202/1553-779X.1870
Available at: http://www.bepress.com/ijeeps/vol10/iss1/art1