CHANGES IN PD PROPERTIES WITH DECREASING VOLTAGE RISE
Paper i proceeding, 2011

The increased use of power electronic components in power systems requires understanding of how rapidly rising voltages affect insulation systems. One important aspect of this challenge is to measure partial discharges, PDs, which are considered as being a sign of insulation weakness and can affect its life considerably. This paper presents a continuation of our earlier investigations on the difference in PD behaviour when voltages characterized by different rise times are applied. The results indicate that the effect on the insulation system is indeed dependent on the voltage wave shape. Applying square-like voltages to a cavity with dielectric insulated electrodes significantly affects the discharge amplitude, its rise time, the inception voltage and the distribution shape. It is further examined how the dimensions of the cavity affect the PD characteristics and the investigation shows that PD amplitude increases while its duration decreases for shorter voltage rise times, being indications of a possible change in the discharge mechanism. This in turn can lead to faster deterioration and reduction of insulation service life. To illustrate the degradation process, microscopic images show how shorter rise times affect differently the cavity surface deterioration, which is consistent with the other observations.

Författare

Thomas Hammarström

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Tord Bengtsson

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Jörgen Blennow

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Stanislaw Gubanski

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

The Proceedings of 17th International Symposium on High Voltage Engineering

D-013

Drivkrafter

Hållbar utveckling

Styrkeområden

Produktion

Energi

Materialvetenskap

Ämneskategorier

Annan materialteknik

Reglerteknik

Annan elektroteknik och elektronik

ISBN

978-3-8007-3364-4

Mer information

Skapat

2017-10-07