Search Results - "Bengtsson, Tord"

Evidence for changing PD properties at short voltage rise times by Hammarstrom, T., Bengtsson, T., Blennow, J., Gubanski, S. M.

“…The increased use of power electronic components in power systems makes it important to understand how rapidly rising voltages affect insulation systems. One…”
Get full text

Influence of rise time on partial discharge extinction voltage at semi-square voltage waveforms by Lindell, E., Bengtsson, T., Blennow, J., Gubanski, S.M.

“…This work presents measurements of the partial discharge (PD) extinction voltage in three different types of test objects, using semi-square voltages with 2 ¿s…”
Get full text

Stochastic detection of partial discharges by Bengtsson, Tord, Lindell, Elisabeth, Hammarstrom, Thomas

“…The traditional method to detect partial discharges relies heavily on the use of high-pass filters. Whereas this is a very effective approach for normal power…”
Get full text

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems by Romano, Pietro, Hammarstrom, Thomas, Bengtsson, Tord, Imburgia, Antonino, Madonia, Antonino, Viola, Fabio, Gubanski, Stanislaw M.

“…In modern HV apparatuses the wide use of electronic converters, increase the stress on the involved insulation systems and thus affect the reliability of the…”
Get full text

PD properties when varying the smoothness of synthesized waveforms by Hammarstrom, Thomas, Bengtsson, Tord, Blennow, Jorgen, Gubanski, Stanislaw

“…The increased use of power electronic components in power systems makes it important to understand how rapidly rising voltages affect insulation systems. One…”
Get full text

Study of partial discharge activity by excess current by Xiangdong Xu, Bengtsson, Tord, Hammarstrom, Thomas, Blennow, Jorgen, Gubanski, Stanislaw M.

“…Measurements of partial discharges (PD) play an important role in study of dielectric materials. This work applies a measurement system based on dielectric…”
Get full text

Loss current studies of partial discharge activity by Xiangdong Xu, Bengtsson, Tord, Hammarström, Thomas, Blennow, Jörgen, Gubanski, Stanislaw M.

“…Partial discharge measurements have important applications in evaluating insulation systems as well as for dielectric materials studies. This work investigates…”
Get full text

Dielectric heating in insulating materials subjected to voltage waveforms with high harmonic content by Sonerud, B., Bengtsson, T., Blennow, J., Gubanski, S.M.

“…Dielectric heating is one potential aging mechanism active below partial discharge inception voltage in materials used as high voltage insulation. When exposed…”
Get full text

Enhanced accuracy in dielectric response material characterization by air reference method by Xiangdong Xu, Bengtsson, T., Blennow, J., Gubanski, S. M.

“…Dielectric response measurements are an important technique to characterize dielectric materials. However, the electrode arrangements as well as the accuracy…”
Get full text

Evaluation of a PD Measuring System for Repititive Steep Voltage Waveforms by Lindell, Elisabeth, Bengtsson, Tord, Blennow, Jörgen, Gubanski, Stanislaw

Get full text

Dielectric response measurements utilizing semi-square voltage waveforms by Sonerud, B., Bengtsson, T., Blennow, J., Gubanski, S.M.

“…Dielectric response measurements belong to the group of diagnostic tools used for quality evaluation of high voltage insulation systems. A measurement system…”
Get full text

Measurement of partial discharges at rapidly changing voltages by Lindell, E., Bengtsson, T., Blennow, J., Gubanski, S.M.

“…This work presents a measuring system for PDs at repetitive voltages with short rise times, based on a coupling device adapted for this kind of voltages and a…”
Get full text

Noise and Aliasing Aspects in a Multiharmonic-Dielectric-Response-Measurement System by Sonerud, B., Bengtsson, T., Blennow, J., Gubanski, S. M.

“…Dielectric-response measurements are commonly performed with frequency-domain spectroscopy, polarization/depolarization-current measurements, or return-voltage…”
Get full text

Evaluation of a PD measuring system for repetitive steep voltage waveforms by Lindell, E, Bengtsson, T, Blennow, Jörgen, Gubanski, S M

“…Measurements of partial discharges (PDs) at high frequency voltages is important but not a straightforward task. In this paper a PD measuring system developed…”
Get full text

Dielectric response measurements during electrical treeing in sub-picofarad samples by Sonerud, Björn, Bengtsson, Tord, Blennow, Jörgen, Gubanski, Stanislaw M., Nilsson, Susanne

“…A technique called Arbitrary Waveform Impedance Spectroscopy (AWIS) developed for measuring dielectric properties in insulating materials has been used to…”
Get full text

Understanding the Sympathetic Inrush Phenomenon in the Power Network using Transformer Explorer by Sahoo, Subrat, Abeywickrama, Nilanga, Bengtsson, Tord, Saers, Robert

“…An in-service transformer in a substation may experience sympathetic inrush phenomenon due to startup inrush current from an incoming transformer, energized…”
Get full text

Capacitance measurements and tree length estimation during electrical treeing in sub-picofarad samples by Sonerud, B., Bengtsson, T., Blennow, J., Gubanski, S.M., Nilsson, S.

“…A method for measuring capacitance below 1 pF is presented, which is used to measure dielectric properties during electrical treeing in XLPE samples. The…”
Get full text

Continuous monitoring of dielectric properties of LDPE samples during electrical treeing by Sonerud, Björn, Blennow, Jörgen, Gubanski, Stanislaw M, Nilsson, Susanne, Bengtsson, Tord

“…A technique capable of utilizing voltage waveforms containing harmonics for measurements of dielectric response over a range of frequencies is presented. It…”
Get full text

Study of Partial Discharges at the Positive and Negative Voltage Flanks of Semi-Square Voltages by Lindell, E., Bengtsson, T., Blennow, J.

“…Experiences from the use of a measuring system for detection of partial discharges (PDs) at a repetitive, unipolar, square-like voltage with a rise time of 2.0…”
Get full text

Monitoring power transformer performance, usage and system event impacts - A case study by Sahoo, Subrat, Bengtsson, Tord, Abeywickrama, Nilanga, Saers, Robert, Hedberg, Jonas, Rosenlind, Johanna

“…This paper investigates the condition of a three phase, 132/30 kV, 50MVA transformer, in a Swedish Utility site. Transformer Explorer, as an online fault…”
Get full text