Thomas Hammarström

Lecturer at Electric Power Engineering

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

Contact Details

Publications (39)
Projects (4)

Showing 39 publications

2021

Combination of Adjustable Inverter Level and Voltage Rise Time for Electrical Stress Reduction in PWM Driven Motor Windings

Thomas Hammarström

IEEE Electrical Insulation Magazine. Vol. 37 (1), p. 17-26

Journal article

2020

A General Measurement Set-up Approach to Evaluate Insulation System Quality by Exploring PWM and DC Biased waveforms

Thomas Hammarström

IEEE Transactions on Industry Applications. Vol. 56 (4), p. 3614-3624

Journal article

2020

Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Sarath Kumara, Xiangdong Xu, Thomas Hammarström et al

Energies. Vol. 13 (6)

Journal article

Show project

2020

Comparison of Different Methods for Characterization of DC Conductivity of Insulating Polymers

Sarath Kumara, Xiangdong Xu, Thomas Hammarström et al

2020 IEEE International Conference on Dielectrics, ICD 2020, p. 435-438

Paper in proceeding

Show project

2020

Multi-rise time PWM: A way to reduce PD exposure in motor windings

Thomas Hammarström

IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 27 (2), p. 613-621

Journal article

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

Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP, p. 666-669

Paper in proceeding

2019

The Implications on the PD Characteristics of Unipolar versus Bipolar PWM waveforms

Thomas Hammarström

2019 IEEE Electrical Insulation Conference, EIC 2019, p. 42-45

Paper in proceeding

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 utilizing Multi Level PWM Waveforms

Thomas Hammarström

Paper in proceeding

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

The Implications of varios PWM shaped contributions Superimposed on DC Bias Voltages

Thomas Hammarström

Paper in proceeding

2019

Partial discharge classification in power electronics applications using machine learning

Ebrahim Balouji, Thomas Hammarström, Tomas McKelvey

GlobalSIP 2019 - 7th IEEE Global Conference on Signal and Information Processing, Proceedings

Paper in proceeding

2019

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

G. Rizzo, P. Romano, G. Ala et al

Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP, p. 536-539

Paper in proceeding

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 proceeding

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 proceeding

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 proceeding

2018

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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 proceeding

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

Other 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 proceeding

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

Yingwei Ouyang Christian Müller Group

Christian Müller Christian Müller Group

Roland Kádár Engineering Materials

Aleksandar Matic Materials Physics

Yuriy Serdyuk Power grids and Components

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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