Resistance to High-Voltage Arcing and to Tracking and Erosion of Silicone/SiO 2 Nanocomposites

1. Study Committee D1 Materials and Emerging Test Techniques Resistance to High-Voltage Arcing and to Tracking and Erosion of Silicone/SiO2Nanocomposites Josef Kindersberger, Stephanie Rätzke, Johannes Seiler Laboratory for High Voltage Technology and Power Transmission TechnischeUniversitätMünchen, 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:estimationofinterphasevolumecontentdependent on thicknessofinterphasearoundfillerparticles experimental resultscanbeexplainedbydefferentinterphasethicknessesaroundthe different fillerparticles • Objects ofinvestigation • mixture from silicone rubber and silicone resin containing differently manufactured nanoparticles (silica 1, F1 precipitated; silica 2, F2 fumed) • Experimental setup & testresults • 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