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Study Committee D1
Materials and Emerging Test Techniques
Resistance to High-Voltage Arcing and to Tracking
and Erosion of Silicone/SiO2 Nanocomposites
Josef Kindersberger, Stephanie Rätzke, Johannes Seiler
Laboratory for High Voltage Technology and Power Transmission
Technische Universität München, Germany
Motivation
•
properties of polymeric insulating materials are
influenced by the used filler material
•
nanoscale filler materials instead or additionally to
conventional filler types can improve the material
performance, especially for the resistance to partial
discharges and the treeing performance
 High potential of nanocomposites for the use in high
voltage insulation
Method
•
nanocomposite: polymeric material with filler particles
having a size < 100 nm
•
very high interphase content in nanocomposites 
interphase can effect the properties of the whole material
Discussion
• Interphase-Volume Model:
estimation of interphase volume content dependent on
thickness of interphase around filler particles
 experimental results can be explained by defferent
interphase thicknesses around the different filler particles
Objects of investigation
•
mixture from silicone rubber and silicone resin containing
differently manufactured nanoparticles (silica 1, F1
precipitated; silica 2, F2 fumed)
Experimental setup & test results
•
investigation of the resistance to high voltage arcing and
the resistance to tracking and erosion according to
IEC 61621 and IEC 60587
•
investigation of the thermal resistance by
thermogravimetric analysis (TGA)
•
improvements of properties are much more significant for
silicones containing filler silica 1 (F1) than filler silica 2 (F2
Conclusion
• Resistance to hv arcing and tracking&erosion can be
improved by nanofillers, but manufacturing process of the
filler particles has significant influence on the material
performance
• Results can be explained by Interphase-Volume Model
http://www.cigre.org