Investigation of Transformer-Based Solutions for the Reduction of Inrush and Phase-Hop Currents

Rasim Dogan, Saeed Jazebi, Francisco De Leon

Research output: Contribution to journalArticle

Abstract

A comprehensive literature review shows that transformer-based solutions are superior for the mitigation of inrush currents than external (to the transformer) solutions. The use of air gaps and low-permeability (iron) materials are known techniques for this purpose. This paper investigates the effectiveness of these approaches for reducing inrush and phase-hop currents. Studies are carried out on toroidal transformers, due to their broad application in power electronics devices. Contrary to common belief, this paper demonstrates that air gaps do not reduce the inrush currents when a transformer is fully demagnetized. However, inrush currents can be mitigated by the use of low-permeability iron materials. It is also demonstrated that air-gaps significantly reduce inrush currents when transformers have residual flux, e.g., for phase-hop conditions. Analytical expressions are derived to compute the mitigation factor for a specific gap length. The results and formulae presented in this paper are verified with laboratory experiments, transient simulations with validated circuit models, and 2-D finite element simulations.

Original languageEnglish (US)
Article number7163614
Pages (from-to)3506-3516
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume31
Issue number5
DOIs
StatePublished - May 1 2016

Fingerprint

Air
Iron
Electric instrument transformers
Power electronics
Fluxes
Networks (circuits)
Experiments

Keywords

  • Air-gap
  • inrush currents
  • low-permeability materials
  • phase-hop current
  • toroidal transformers
  • UPS

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Investigation of Transformer-Based Solutions for the Reduction of Inrush and Phase-Hop Currents. / Dogan, Rasim; Jazebi, Saeed; De Leon, Francisco.

In: IEEE Transactions on Power Electronics, Vol. 31, No. 5, 7163614, 01.05.2016, p. 3506-3516.

Research output: Contribution to journalArticle

@article{cfeba48567f44c768af069e36032c43f,
title = "Investigation of Transformer-Based Solutions for the Reduction of Inrush and Phase-Hop Currents",
abstract = "A comprehensive literature review shows that transformer-based solutions are superior for the mitigation of inrush currents than external (to the transformer) solutions. The use of air gaps and low-permeability (iron) materials are known techniques for this purpose. This paper investigates the effectiveness of these approaches for reducing inrush and phase-hop currents. Studies are carried out on toroidal transformers, due to their broad application in power electronics devices. Contrary to common belief, this paper demonstrates that air gaps do not reduce the inrush currents when a transformer is fully demagnetized. However, inrush currents can be mitigated by the use of low-permeability iron materials. It is also demonstrated that air-gaps significantly reduce inrush currents when transformers have residual flux, e.g., for phase-hop conditions. Analytical expressions are derived to compute the mitigation factor for a specific gap length. The results and formulae presented in this paper are verified with laboratory experiments, transient simulations with validated circuit models, and 2-D finite element simulations.",
keywords = "Air-gap, inrush currents, low-permeability materials, phase-hop current, toroidal transformers, UPS",
author = "Rasim Dogan and Saeed Jazebi and {De Leon}, Francisco",
year = "2016",
month = "5",
day = "1",
doi = "10.1109/TPEL.2015.2459032",
language = "English (US)",
volume = "31",
pages = "3506--3516",
journal = "IEEE Transactions on Power Electronics",
issn = "0885-8993",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5",

}

TY - JOUR

T1 - Investigation of Transformer-Based Solutions for the Reduction of Inrush and Phase-Hop Currents

AU - Dogan, Rasim

AU - Jazebi, Saeed

AU - De Leon, Francisco

PY - 2016/5/1

Y1 - 2016/5/1

N2 - A comprehensive literature review shows that transformer-based solutions are superior for the mitigation of inrush currents than external (to the transformer) solutions. The use of air gaps and low-permeability (iron) materials are known techniques for this purpose. This paper investigates the effectiveness of these approaches for reducing inrush and phase-hop currents. Studies are carried out on toroidal transformers, due to their broad application in power electronics devices. Contrary to common belief, this paper demonstrates that air gaps do not reduce the inrush currents when a transformer is fully demagnetized. However, inrush currents can be mitigated by the use of low-permeability iron materials. It is also demonstrated that air-gaps significantly reduce inrush currents when transformers have residual flux, e.g., for phase-hop conditions. Analytical expressions are derived to compute the mitigation factor for a specific gap length. The results and formulae presented in this paper are verified with laboratory experiments, transient simulations with validated circuit models, and 2-D finite element simulations.

AB - A comprehensive literature review shows that transformer-based solutions are superior for the mitigation of inrush currents than external (to the transformer) solutions. The use of air gaps and low-permeability (iron) materials are known techniques for this purpose. This paper investigates the effectiveness of these approaches for reducing inrush and phase-hop currents. Studies are carried out on toroidal transformers, due to their broad application in power electronics devices. Contrary to common belief, this paper demonstrates that air gaps do not reduce the inrush currents when a transformer is fully demagnetized. However, inrush currents can be mitigated by the use of low-permeability iron materials. It is also demonstrated that air-gaps significantly reduce inrush currents when transformers have residual flux, e.g., for phase-hop conditions. Analytical expressions are derived to compute the mitigation factor for a specific gap length. The results and formulae presented in this paper are verified with laboratory experiments, transient simulations with validated circuit models, and 2-D finite element simulations.

KW - Air-gap

KW - inrush currents

KW - low-permeability materials

KW - phase-hop current

KW - toroidal transformers

KW - UPS

UR - http://www.scopus.com/inward/record.url?scp=84961888074&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961888074&partnerID=8YFLogxK

U2 - 10.1109/TPEL.2015.2459032

DO - 10.1109/TPEL.2015.2459032

M3 - Article

VL - 31

SP - 3506

EP - 3516

JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

SN - 0885-8993

IS - 5

M1 - 7163614

ER -