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Fredrik Sahlén - IEEE Xplore Author Profile
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Fredrik Sahlén

Also published under: F. Sahlen, F. Sahlén, Fredrik Sahlen

Publications
10
Citations
136
Publications by Year
20042023
Co-Authors:
Show All Co-Authors (30)
Image of author Fredrik Sahlén

Fredrik Sahlén

Also published under: F. Sahlen, F. Sahlén, Fredrik Sahlen

Affiliation

ABB Corporate Research, Västerås, Sweden

Publication Topics

Biography

Fredrik Sahlén received the M.Sc. degree in chemical engineering in 1991 and the Ph.D. degree in polymer technology in 1996 from the Royal Institute of Technology (KTH) in Stockholm, Sweden. Two postdoc years in the field of polymers for optical applications at ETH, Switzerland, and Risö National Laboratories, Denmark was followed by employment at ABB Corporate Research in Västerås, Sweden, in 1998. Since then, he has been engaged in investigating and developing electrical insulation systems for power products and rotating machines, with emphasis on insulation properties under fast repetitive voltage stress and fast rise times.(Based on document published on 7 August 2009).
Publications
10
Citations
136
Publications by Year
20042023
Co-Authors:
Show All Co-Authors (30)
Author's Published Works

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Factors influencing the partial discharge inception voltage in Type I insulation systems

Fredrik Sahlén;Markus Takala

2023 IEEE Electrical Insulation Conference (EIC)
Year: 2023 | Conference Paper |
Cited by: Papers (3)
With the increased use of inverter-fed random wound motors in transport applications the importance of understanding the factors which influence the inception of discharge phenomena in Type I insulation systems increases. This paper describes the influence of temperature, applied voltage type (ac and repetitive pulse), impregnation resin and flexible laminate thickness on the partial discharge inc...Show More

Factors influencing the partial discharge inception voltage in Type I insulation systems

Fredrik Sahlén;Markus Takala

Year: 2023 | Conference Paper |

A micro-computed tomography investigation of the breakdown paths in mica/epoxy machine insulation

Carl Saxén;E. Kristofer Gamstedt;Reza Afshar;Göran Paulsson;Fredrik Sahlén

IEEE Transactions on Dielectrics and Electrical Insulation
Year: 2018 | Volume: 25, Issue: 4 | Journal Article |
Cited by: Papers (7)
X-ray computed tomography is a technology capable of visualizing a wide variety of materials in 3D. In this investigation, insulation samples were electrically aged and computed tomography imaging was used for analysis of the microstructure and breakdown paths. Samples consisting of mica tape wrapped around aluminum tubes and impregnated with epoxy resin were produced. Two samples were electricall...Show More

A micro-computed tomography investigation of the breakdown paths in mica/epoxy machine insulation

Carl Saxén;E. Kristofer Gamstedt;Reza Afshar;Göran Paulsson;Fredrik Sahlén

Year: 2018 | Volume: 25, Issue: 4 | Journal Article |

Ageing behaviour and temperature rise in end corona protection layer for high voltage machines subjected to converter-like voltages

G. Paulsson;F. Sahlén;E. Mårtensson;B. Holmgren;J. Virtanen

2017 INSUCON - 13th International Electrical Insulation Conference (INSUCON)
Year: 2017 | Conference Paper |
Cited by: Papers (2)
The concern of energy consumption regarding the usage of rotating electrical machines, has in recent years made a major impact on the market for converter driven high voltage machines. Converter driven machines may better adjust the output power to the need of the load, in comparison to line-fed machines, and thereby save energy. Throughout the years the corona protection system of high voltage ro...Show More

Ageing behaviour and temperature rise in end corona protection layer for high voltage machines subjected to converter-like voltages

G. Paulsson;F. Sahlén;E. Mårtensson;B. Holmgren;J. Virtanen

Year: 2017 | Conference Paper |

Experimental investigation of the voltage distribution in form wound windings of large AC machines due to fast transients

Andreas Krings;Göran Paulsson;Fredrik Sahlén;Björn Holmgren

2016 XXII International Conference on Electrical Machines (ICEM)
Year: 2016 | Conference Paper |
Cited by: Papers (41)
This paper investigates the voltage distribution in form wound windings of large electrical machines due to fast transient voltage steps, usually produced by (multi-level) voltage source inverters. Measurements are conducted on a stator core of a large prototype machine with voltage step rise times between 0.1 and 10 The measurement results of the voltage distribution in one phase string of the st...Show More

Experimental investigation of the voltage distribution in form wound windings of large AC machines due to fast transients

Andreas Krings;Göran Paulsson;Fredrik Sahlén;Björn Holmgren

Year: 2016 | Conference Paper |

Life-time investigation of mica-based insulation for high voltage machines subjected to converter-like voltages

Fredrik Sahlén;Göran Paulsson;Eva Mårtensson

2016 IEEE Electrical Insulation Conference (EIC)
Year: 2016 | Conference Paper |
Cited by: Papers (11)
The industrial use of converter fed high-voltage machines is steadily growing. The driver behind the growth is the possibility to control the output power from the machine to be adjusted to the actual needed power of the load. This leads to a more cost- and energy efficient use of the assets. For some applications the development of the converter topology has gone from 2-level to multi-level, whic...Show More

Life-time investigation of mica-based insulation for high voltage machines subjected to converter-like voltages

Fredrik Sahlén;Göran Paulsson;Eva Mårtensson

Year: 2016 | Conference Paper |

Analysis of the micromechanical deformation in pressboard performed by X-ray microtomography

Orlando Girlanda;Fredrik Sahlén;Thomas Joffre;E. Kristofer Gamstedt;Lars E. Schmidt;Fredrik Forsberg;Mikael Sjödahl

2015 IEEE Electrical Insulation Conference (EIC)
Year: 2015 | Conference Paper |
Cited by: Papers (6)
A large number of electrical insulation components are produced in paper-based materials. Paper combines good insulating properties with the necessary mechanical and chemical stability. Paper consists of a system of fibers binding to each other creating a strong network. The presence of large open pores allows for impregnability of the material but also causes mechanical weakness in particular in ...Show More

Analysis of the micromechanical deformation in pressboard performed by X-ray microtomography

Orlando Girlanda;Fredrik Sahlén;Thomas Joffre;E. Kristofer Gamstedt;Lars E. Schmidt;Fredrik Forsberg;Mikael Sjödahl

Year: 2015 | Conference Paper |

Investigation of mica based insulation for high voltage machines subjected to repetitive pulsed voltage

Fredrik Sahlén;Li Ming;Kenneth Johansson;Eva Mårtensson;Osmo Koponen

2010 IEEE International Symposium on Electrical Insulation
Year: 2010 | Conference Paper |
Cited by: Papers (8)
The interest in the prediction and qualification of insulation life performance in high voltage machines fed by converters has steadily grown, since the use of these machines is gradually increasing. The voltage stress on the insulation system is different for converter fed machines compared to machines fed online with power frequency voltage. The common interest in this subject has lead to the re...Show More

Investigation of mica based insulation for high voltage machines subjected to repetitive pulsed voltage

Fredrik Sahlén;Li Ming;Kenneth Johansson;Eva Mårtensson;Osmo Koponen

Year: 2010 | Conference Paper |

Repetitive fast voltage stresses-causes and effects

Tord Bengtsson;Frans Dijkhuizen;Li Ming;Fredrik Sahlen;Lars Liljestrand;Dierk Bormann;Ruslan Papazyan;Mikael Dahlgren

IEEE Electrical Insulation Magazine
Year: 2009 | Volume: 25, Issue: 4 | Magazine Article |
Cited by: Papers (45)
In this article, we have seen how high-frequency system resonances, triggered by power electronic devices, may enhance both electrical and thermal stress on an insulation system. An important lesson from this study is that even an insulation system that is very well designed according to present standards may fail if it is subjected to stresses that were never considered in the design. The root ca...Show More

Repetitive fast voltage stresses-causes and effects

Tord Bengtsson;Frans Dijkhuizen;Li Ming;Fredrik Sahlen;Lars Liljestrand;Dierk Bormann;Ruslan Papazyan;Mikael Dahlgren

Year: 2009 | Volume: 25, Issue: 4 | Magazine Article |

Humidity effects on dielectric strength of air-gaps for indoor HV installations

L. Ming;F. Sahlen;G. Wu;G. Asplund;B. Jacobson

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.
Year: 2005 | Conference Paper |
Cited by: Papers (2)
For indoor HV installations, the electrode configurations of air-gaps are different from outdoor HV apparatus and the fields are usually optimized. The humidity can be lower and the temperature is often higher than the outdoor atmosphere. In order to study the effect of humidity on the breakdown voltage of the indoor air-gaps, laboratory tests were performed on the typical indoor air gaps-toroid/p...Show More

Humidity effects on dielectric strength of air-gaps for indoor HV installations

L. Ming;F. Sahlen;G. Wu;G. Asplund;B. Jacobson

Year: 2005 | Conference Paper |

Impacts of high-frequency voltage on cable-terminations with resistive stressgrading

Li Ming;F. Sahlen;S. Halen;G. Brosig;L. Palmqvist

Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004.
Year: 2004 | Conference Paper |
Cited by: Papers (11)
Behaviors of insulation system are strongly affected by frequency of the system voltages. In addition to power-frequency voltage, the insulation system could be also exposed to a voltage with frequency on the order of kHz due to application of new HV devices. Insulation failures under HF voltages occur not only because of lower breakdown strength of dielectric material under HF voltage but also be...Show More

Impacts of high-frequency voltage on cable-terminations with resistive stressgrading

Li Ming;F. Sahlen;S. Halen;G. Brosig;L. Palmqvist

Year: 2004 | Volume: 1 | Conference Paper |

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