Thomas Hammarström

Associate Professor 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
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Showing 61 publications

2024

Overshoot level studies of PD Exposure in High Voltage Motor Isolation

Thomas Hammarström
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. In press
Journal article
2024

Trends in Diagnostics and Monitoring of High-Voltage Insulation

B. Biswas, B. X. Du, M. Florkowski et al
IEEE Electrical Insulation Magazine. Vol. 40 (4), p. 6-26
Journal article
2024

Evaluation of Data Acquisition Systems for Dielectric Frequency Response Measurements

Daniel Svensson, Thomas Hammarström, X. Xu et al
Proceedings of the 2024 IEEE 5th International Conference on Dielectrics, ICD 2024
Paper in proceeding
2024

Partial Discharge Characterization in a Defect Subjected to HVDC Cable Operating Conditions

A. Imburgia, G. Rizzo, G. Ala et al
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 31 (4), p. 1729-1737
Journal article
2023

Influence of voltage overshoot in enamel wire winding insulation systems

Thomas Hammarström
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2023
Paper in proceeding
2023

Square Shaped Waveform Pulse Control to minimize PD Exposure within Motor Insulation

Thomas Hammarström, Stanislaw Gubanski
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 30 (4), p. 1850-1857
Journal article
2023

Influence of PD characteristics within motor windings exposed to elevated temperatures

Thomas Hammarström
2023 International Symposium on Electrical Insulating Materials, p. 324-327
Paper in proceeding
2023

The Use of PD Patterns to Evaluate the Wear-Resistance and Manufacturing Quality to Estimate Expected Lifetime of Ignition Coils

Johan Tidholm, Martin Gordon, Thomas Hammarström
Proceedings of ASME 2023 ICE Forward Conference, ICEF 2023
Paper in proceeding
2022

Evaluation of Different Waveforms to Study the Insulation Performance on Electrical Vehicle Motors

Thomas Hammarström
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2022-November, p. 439-442
Paper in proceeding
2022

Classification of Partial Discharges Originating from Multi-level PWM Using Machine Learning

Ebrahim Balouji, Thomas Hammarström, Tomas McKelvey
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 29 (1), p. 287-294
Journal article
2022

DC Electrical Trees in Polymer Insulation Inflicted by Rapidly Decreasing Short Circuit Voltage Flanks

Thomas Hammarström, Sarath Kumara, Xiangdong Xu et al
ICD 2022 - IEEE 2022 4th International Conference on Dielectrics, Proceedings, p. 154-157
Paper in proceeding
2022

Invariant electrical conductivity upon thermal ageing of a crosslinked copolymer blend for high voltage insulation

Sarath Kumara, Amir Masoud Pourrahimi, Azadeh Soroudi et al
Materials Advances. Vol. 3 (11), p. 4718-4723
Journal article
2022

Evaluation of different approaches to measure partial discharge characteristics within electric motor insulation

Thomas Hammarström
2022 International Conference on Electrical Machines and Systems, ICEMS 2022, p. 1-6
Paper in proceeding
2022

Reduction of Electric Stress in High Voltage Motor Insulation by Adjusting Individual PWM Flanks

Thomas Hammarström
2022 IEEE International Conference on Power Systems Technology: Embracing Advanced Technology in Power and Energy Systems for Sustainable Development, POWERCON 2022
Paper in proceeding
2021

Detection of Electrical Tree Formation in XLPE Insulation through Applying Disturbed DC Waveforms

Thomas Hammarström, Stanislaw Gubanski
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 28 (5), p. 1669-1676
Journal article
2021

Repurposing Poly(3-hexylthiophene) as a Conductivity-Reducing Additive for Polyethylene-Based High-Voltage Insulation

Amir Masoud Pourrahimi, Sarath Kumara, Fabrizio Palmieri et al
Advanced Materials. Vol. 33 (27)
Journal article
2021

Characteristics of partial discharges in an experimental setup reproducing HVDC cable insulation operating conditions

G. Rizzo, Thomas Hammarström, A Imburgia et al
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2021-December, p. 191-194
Paper in proceeding
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
2021

Polarity Effect on Electric Tree Inception in HVDC Cable Insulation

Sarath Kumara, Thomas Hammarström, Yuriy Serdyuk
IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 28 (5), p. 1819-1827
Journal article
2021

PWM Voltage Rise Time and Pulse Width Control to Minimize Partial Discharge Exposure

Thomas Hammarström
ICEMS 2021 - 2021 24th International Conference on Electrical Machines and Systems, p. 2611-2615
Paper in proceeding
2021

DC Electrical Trees in XLPE Induced by Short Circuits

Sarath Kumara, Thomas Hammarström, Xiangdong Xu et al
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2021-December, p. 275-278
Paper in proceeding
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
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

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

Sarath Kumara, Xiangdong Xu, Thomas Hammarström et al
Proceedings of the 2020 IEEE 3rd International Conference on Dielectrics, ICD 2020, p. 435-438
Paper in proceeding
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

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. Vol. 2019-October, p. 536-539
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 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. Vol. 2019-October, 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
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. Vol. 2018-May, p. 148-151
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. Vol. 2018-October, p. 558-561
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 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

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
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 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
2017

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

Thomas Hammarström, Tord Bengtsson, Stanislaw Gubanski
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2017-October, p. 307-310
Paper in proceeding
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
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2016-December, 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
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. Vol. 2016-December, p. 247-250
Paper in proceeding
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
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
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 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 Discharges at Fast Rising Voltages

Thomas Hammarström
Doctoral thesis
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
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
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

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
2011

Detection of Partial Discharges at Fast Rising Voltages

Thomas Hammarström
Licentiate thesis
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
2005

Method for measuring cylinder specific parameters in a combustion engine

Jörgen Bengtsson, Thomas Hammarström
Patent
2003

Design and evaluation of the ELEVATE two-stroke automotive engine

Dave blundell, Jamie Turner, Pierre Duret et al
SAE (Society of Automotive Engineers) Transactions. Vol. 112 (3), p. 613-627
Journal article

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Showing 4 research projects

2024–2025

Predicting lifetime of dynamic cables for floating marine energy harvesting platforms

Yuriy Serdyuk Power grids and Components
Jonas Ringsberg Marine Technology
Zhiyuan Li Marine Technology
Thomas Hammarström Power grids and Components
Moon Moon Bordeori Power grids and Components
AoA Energy

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

4 publications exist
2018–

Mechanisms of partial discharges in polymeric HVDC power cables

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

2 publications exist
There might be more projects where Thomas Hammarström participates, but you have to be logged in as a Chalmers employee to see them.