Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Power Transformer Immune to Geomagnetically Induced Currents

Samuelsson, Olof LU (2013) IEEE Power & Energy Society General Meeting, 2013
Abstract
Geomagnetically induced currents (GICs) flow mainly through power lines, earthed transformers and earth itself. The near DC currents may cause half-cycle saturation of transformers, possibly causing relay misoperation, increased reactive power demand and damage to transformers. This paper describes a patented idea to make a transformer immune to GIC using compensation windings in each phase. A compensation winding has one third of the turns of the main winding it protects and the three windings are connected in series between neutral point and earth. Time simulations demonstrate that the principle is effective for single-phase transformers, which is the transformer type most sensitive to GIC. It is also shown that the function is affected... (More)
Geomagnetically induced currents (GICs) flow mainly through power lines, earthed transformers and earth itself. The near DC currents may cause half-cycle saturation of transformers, possibly causing relay misoperation, increased reactive power demand and damage to transformers. This paper describes a patented idea to make a transformer immune to GIC using compensation windings in each phase. A compensation winding has one third of the turns of the main winding it protects and the three windings are connected in series between neutral point and earth. Time simulations demonstrate that the principle is effective for single-phase transformers, which is the transformer type most sensitive to GIC. It is also shown that the function is affected neither by active and reactive load current nor by high GIC levels. GIC immunity is of particular interest for key transformers, as in large power plants, at the power system periphery, where GIC levels are in general higher. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
compensation geomagnetism power transformers transformer windings
host publication
Power and Energy Society General Meeting (PES), 2013 IEEE
pages
5 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE Power & Energy Society General Meeting, 2013
conference location
Vancouver, Canada
conference dates
2013-06-21 - 2013-07-25
external identifiers
  • wos:000331874302004
  • scopus:84893192243
ISSN
1944-9925
DOI
10.1109/PESMG.2013.6672596
language
English
LU publication?
yes
id
b45fbc9f-b5ac-447b-b041-24763978030f (old id 4388326)
date added to LUP
2016-04-01 14:53:25
date last changed
2022-01-28 02:59:03
@inproceedings{b45fbc9f-b5ac-447b-b041-24763978030f,
  abstract     = {{Geomagnetically induced currents (GICs) flow mainly through power lines, earthed transformers and earth itself. The near DC currents may cause half-cycle saturation of transformers, possibly causing relay misoperation, increased reactive power demand and damage to transformers. This paper describes a patented idea to make a transformer immune to GIC using compensation windings in each phase. A compensation winding has one third of the turns of the main winding it protects and the three windings are connected in series between neutral point and earth. Time simulations demonstrate that the principle is effective for single-phase transformers, which is the transformer type most sensitive to GIC. It is also shown that the function is affected neither by active and reactive load current nor by high GIC levels. GIC immunity is of particular interest for key transformers, as in large power plants, at the power system periphery, where GIC levels are in general higher.}},
  author       = {{Samuelsson, Olof}},
  booktitle    = {{Power and Energy Society General Meeting (PES), 2013 IEEE}},
  issn         = {{1944-9925}},
  keywords     = {{compensation geomagnetism power transformers transformer windings}},
  language     = {{eng}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Power Transformer Immune to Geomagnetically Induced Currents}},
  url          = {{http://dx.doi.org/10.1109/PESMG.2013.6672596}},
  doi          = {{10.1109/PESMG.2013.6672596}},
  year         = {{2013}},
}