Thomas Hammarström

Lecturer at Power grids and Components

I received my Ph.D. degree 2014 in High Voltage Engineering at Chalmers University of Technology in Gothenburg, Sweden, where the main focus is on analyzing partial discharges occurring within high voltage insulation at steep voltage fronts, such as PWM. The main goal is to understand and quantify the increased electricall struss caused by such waveforms. This research aims to provide insights will act as an aid to improve the life of high voltage insulation such as motor windings.

Source: chalmers.se

Showing 32 publications

2019

The Effect of the Harmonic Content Generated by AC/DC Modular Multilevel Converters on HVDC Cable Systems

P. Romano, A. Imburgia, Yuriy Serdyuk et al
Paper in proceedings
2019

Multilevel PWM: A Tool to Explore Insulation PD Characteristics

Thomas Hammarström
IEEE Transactions on Instrumentation and Measurement. Vol. 68 (10), p. 4075-4084
Journal article
2019

Partial discharge characteristics of electrical treeing in XLPE insulation exposed to voltages of different rise times

Thomas Hammarström, Tord Bengtsson, Stanislaw Gubanski
IEEJ Transactions on Fundamentals and Materials. Vol. 139 (2), p. 85-91
Journal article
2019

Deformation of bubbles in silicon gel insulation under an alternating electric field

G. Rizzo, P. Romano, G. Ala et al
Paper in proceedings
2018

Differences in partial discharge characteristics due to increased conductivity of the insulation material

Thomas Hammarström
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
Paper in proceedings
2018

Partial Discharge Measurements under DC Voltages Containing Harmonics Produced by Power Electronic Devices

Pietro Romano, Amir Parastar, A. Imburgia et al
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP, p. 558-561
Paper in proceedings
2018

Partial discharge characteristics within motor insulatioi exposed to multi-level PWM waveforms

Thomas Hammarström
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 25 (2), p. 559-567
Journal article
2018

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

P. Romano, Thomas Hammarström, Tord Bengtsson et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 25 (2), p. 584-593
Journal article
2018

A Measurement Set-Up Method to Evaluate Motor Winding Quality and Winding Insulation by Exploring Discharge Characteristics

Thomas Hammarström
2018 21st International Conference on Electrical Machines and Systems (ICEMS), p. 678-683
Paper in proceedings
2018

Partial discharge characteristics within motor insulation exposed to multi-level PWM waveforms

Thomas Hammarström
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 25 (Issue 2), p. 559-567
Journal article
2018

Partial discharge characteristics at ultra-short voltage risetimes

Thomas Hammarström
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 25 (6), p. 2241-2249
Journal article
2017

Partial Discharge Characteristics of Electrical Treeing in XLPE Insulation Exposed to Voltages of Different Rise Times

Thomas Hammarström, Tomas Bengtsson, Stanislaw Gubanski
2017 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM). Vol. 1-2, p. 407-410
Paper in proceedings
2017

Partial discharge characteristics in motor insulations under exposure to multi-level inverters

Thomas Hammarström, Tord Bengtsson, Stanislaw Gubanski
2017 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENON (CEIDP). Vol. 2017-October, p. 307-310
Paper in proceedings
2016

PD characteristics at Square Shaped Voltages Applying Two Different Detecting

A Madonia, Pietro Romano, Thomas Hammarström et al
IEEE Conference on Electrical Insulation and Dielectric Phenomena 2016
Paper in proceedings
2016

Partial Discharge of Gel Insulated High Voltage Power Modules subjected to Unconventional Voltage Waveforms

A. Madonia, P. Romano, Thomas Hammarström et al
2016 Ieee Conference on Electrical Insulation and Dielectric Phenomena, p. 715-718
Paper in proceedings
2016

PD characteristics at Square Shaped Voltages Applying Two Different Detecting Techniques

A. Madonia, P. Romano, Thomas Hammarström et al
2016 Ieee Conference on Electrical Insulation and Dielectric Phenomena, p. 247-250
Paper in proceedings
2015

Loss Current Studies of Partial Discharge Activity

Xiangdong Xu, Tord Bengtsson, Thomas Hammarström et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 22 (1), p. 472-481
Journal article
2015

Study of Partial Discharge Activity by Excess Current

Xiangdong Xu, Tord Bengtsson, Thomas Hammarström et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 22 (5), p. 3028-3036
Journal article
2014

Partial Discharges in Motor Wires at PWM Voltages of Different Smoothness

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
Proceedings of 2014 International Symposium on Electrical Insulating Materials (ISEIM 2014), June 1-5, 2014, Niigata City, Japan, p. 184-187
Paper in proceedings
2014

Partial Discharge Behavior of a Newly Developed Enamel Insulation at Various Voltage Rise Times

Tuan Anh Hoang, Thomas Hammarström, Tord Bengtsson et al
Proceedings of 2014 International Symposium on Electrical Insulating Materials (ISEIM 2014), June 1-5, 2014, Niigata City, Japan, p. 241-244
Paper in proceedings
2014

Partial Discharges at Fast Rising Voltages

Thomas Hammarström
Doctoral thesis
2013

Reflections on an Integrated Content and Language Project-Based Design of a Technical Communication Course for Electrical Engineering Students.

Becky Bergman, Ann-Marie Eriksson, Jörgen Blennow et al
Journal of Academic Writing. Vol. 3 (1), p. 1-14
Journal article
2013

Stochastic Detection of Partial Discharges

Tord Bengtsson, Elisabeth Lindell, Thomas Hammarström
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 20 (6), p. 2203-2211
Journal article
2013

PARTIAL DISCHARGES IN A STATOR UNDER SYNTHEZISED VOLTAGE WAVEFORMS

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
Proceedings of the 18th International Symposium on High Voltage Engineering 2013 (CD-ROM)
Paper in proceedings
2013

Analysis of Multiple Electrical Trees Incepted at Wire Electrode Test Object by Means of PD Detection

Anette Johansson, Thomas Hammarström, Markus Jarvid et al
Proc. of Jicable HVDC'13 Seminar, p. paper P06-
Paper in proceedings
2013

PD Properties when Varying the Smoothness of Synthesized Waveforms

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 20 (6), p. 2035-2041
Journal article
2011

Detection of Partial Discharges at Fast Rising Voltages

Thomas Hammarström
Licentiate thesis
2011

Resonant PD signal decoupling circuit for rapidly changing voltages

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
22nd Nordic Insulation Symposium (NORDIS 11), June 13-15, Tampere, Finland, p. 149-152
Conference contribution
2011

CHANGES IN PD PROPERTIES WITH DECREASING VOLTAGE RISE

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
The Proceedings of 17th International Symposium on High Voltage Engineering, p. D-013
Paper in proceedings
2011

Evidence for Changing PD Properties at Short Voltage Rise Times

Thomas Hammarström, Tord Bengtsson, Jörgen Blennow et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 18 (5), p. 1686-1692
Journal article

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Showing 4 research projects

2020–

Activities within materials and diagnostics for high-voltage networks

Yuriy Serdyuk Power grids and Components
Thomas Hammarström Power grids and Components
Sarath Kumara Power grids and Components
Chalmers

2019–2020

Advanced characterization of new insulation materials for next generation of HVDC power cables

Thomas Hammarström Power grids and Components
Christian Müller Christian Müller Group
Roland Kádár Engineering Materials
Yuriy Serdyuk Power grids and Components
Aleksandar Matic Condensed Matter Physics
Yingwei Ouyang Christian Müller Group
Chalmers

2018–

Mechanisms of partial discharges in polymeric HVDC power cables

Yuriy Serdyuk Power grids and Components
Thomas Hammarström Power grids and Components
Chalmers

2017–2021

Power Electronic based dc transformer for off-shore wind energy installations

Torbjörn Thiringer Electric Power Engineering
Babak Alikhanzadehalamdari Electrical Machines and Power Electronics
Thomas Hammarström Power grids and Components
Swedish Energy Agency

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