CHANGES IN PD PROPERTIES WITH DECREASING VOLTAGE RISE

Hammarström, Thomas,1974Chalmers tekniska högskola,Chalmers University of Technology (författare)

The increased use of power electronic components in power systems requiresunderstanding of how rapidly rising voltages affect insulation systems. One importantaspect of this challenge is to measure partial discharges, PDs, which are considered asbeing a sign of insulation weakness and can affect its life considerably. This paperpresents a continuation of our earlier investigations on the difference in PD behaviourwhen voltages characterized by different rise times are applied. The results indicate thatthe effect on the insulation system is indeed dependent on the voltage wave shape.Applying square-like voltages to a cavity with dielectric insulated electrodes significantlyaffects the discharge amplitude, its rise time, the inception voltage and the distributionshape. It is further examined how the dimensions of the cavity affect the PDcharacteristics and the investigation shows that PD amplitude increases while its durationdecreases for shorter voltage rise times, being indications of a possible change in thedischarge mechanism. This in turn can lead to faster deterioration and reduction ofinsulation service life. To illustrate the degradation process, microscopic images showhow shorter rise times affect differently the cavity surface deterioration, which isconsistent with the other observations.

Bengtsson, Tord,1954Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tordb (författare)
Blennow, Jörgen,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)blennow (författare)
Gubanski, Stanislaw,1950Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)staszek (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:The Proceedings of 17th International Symposium on High Voltage Engineering, s. D-0139783800733644

Av författaren/redakt...: Hammarström, Tho ...; Bengtsson, Tord, ...; Blennow, Jörgen, ...; Gubanski, Stanis ...

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