Mitigation of inrush currents in network transformers by reducing the residual flux with an ultra-low-frequency power source

Baris Kovan, Francisco De Leon, Dariusz Czarkowski, Zivan Zabar, Leo Birenbaum

Research output: Contribution to journalArticle

Abstract

A methodology for the reduction of the residual flux in network transformers is proposed in this paper. The purpose is the mitigation of large inrush currents taken by numerous transformers when a long feeder is energized. Time-domain simulations are used to prove that a small-power device can substantially reduce the residual flux of all transformers simultaneously. The device consists of a low-voltage dc source, a suitable power-electronic switching unit, and a simple controller. Before a feeder is re-energized, the residual flux is reduced to a minimum and, as a consequence, the large inrush currents are reduced to an acceptable level. This greatly enhances the probability for the feeder to be successfully energized when otherwise a false trip would have occurred. Inrush current reductions of more than 60% are obtained at the head of the feeder.

Original languageEnglish (US)
Article number5706392
Pages (from-to)1563-1570
Number of pages8
JournalIEEE Transactions on Power Delivery
Volume26
Issue number3
DOIs
StatePublished - Jul 2011

Keywords

  • Inrush currents
  • mitigation of inrush currents
  • residual flux reduction
  • transformers

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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