Thomas Hammarström
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.
Showing 50 publications
Reduction of Electric Stress in High Voltage Motor Insulation by Adjusting Individual PWM Flanks
Classification of Partial Discharges Originating from Multi-level PWM Using Machine Learning
Polarity Effect on Electric Tree Inception in HVDC Cable Insulation
Detection of Electrical Tree Formation in XLPE Insulation through Applying Disturbed DC Waveforms
PWM Voltage Rise Time and Pulse Width Control to Minimize Partial Discharge Exposure
DC Electrical Trees in XLPE Induced by Short Circuits
Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation
Comparison of Different Methods for Characterization of DC Conductivity of Insulating Polymers
Multi-rise time PWM: A way to reduce PD exposure in motor windings
The Implications on the PD Characteristics of Unipolar versus Bipolar PWM waveforms
Multilevel PWM: A Tool to Explore Insulation PD Characteristics
Partial discharge classification in power electronics applications using machine learning
Deformation of bubbles in silicon gel insulation under an alternating electric field
Partial discharge characteristics within motor insulatioi exposed to multi-level PWM waveforms
Partial discharge characteristics in motor insulations under exposure to multi-level inverters
Partial discharge characteristics within motor insulation exposed to multi-level PWM waveforms
Partial discharge characteristics at ultra-short voltage risetimes
PD characteristics at Square Shaped Voltages Applying Two Different Detecting
PD characteristics at Square Shaped Voltages Applying Two Different Detecting Techniques
Loss Current Studies of Partial Discharge Activity
Study of Partial Discharge Activity by Excess Current
Partial Discharges in Motor Wires at PWM Voltages of Different Smoothness
Partial Discharge Behavior of a Newly Developed Enamel Insulation at Various Voltage Rise Times
Stochastic Detection of Partial Discharges
PARTIAL DISCHARGES IN A STATOR UNDER SYNTHEZISED VOLTAGE WAVEFORMS
PD Properties when Varying the Smoothness of Synthesized Waveforms
Resonant PD signal decoupling circuit for rapidly changing voltages
CHANGES IN PD PROPERTIES WITH DECREASING VOLTAGE RISE
Evidence for Changing PD Properties at Short Voltage Rise Times
Design and evaluation of the ELEVATE two-stroke automotive engine
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Showing 4 research projects
Activities within materials and diagnostics for high-voltage networks
Advanced characterization of new insulation materials for next generation of HVDC power cables
Mechanisms of partial discharges in polymeric HVDC power cables
Power Electronic based dc transformer for off-shore wind energy installations