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Sökning: WFRF:(Kannus K)

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1.
  • Takala, M., et al. (författare)
  • Dielectric Properties and Partial Discharge Endurance of Polypropylene- Silica Nanocomposite
  • 2010
  • Ingår i: IEEE Transactions on Dielectrics and Electrical Insulation. - 1558-4135 .- 1070-9878. ; 17:4, s. 1259-1267
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents the results of the dielectric properties and partial discharge endurance measurements conducted on polypropylene (PP)-silica nanocomposite. The material compounds were analyzed with micro-Raman spectroscopy, X-ray tomography and transmission electron microscopy (TEM). ac and dc breakdown strength of the materials was measured. Dielectric response, capacitance and loss factor of the film samples were measured as a function of temperature and frequency. Partial discharge (PD) endurance of the reference PP and PP Silica nanocomposite was studied as a function of ac voltage. Material surfaces were analyzed after PD stress with optical microscopy. All dielectric measurements were done for oriented thin films with a thickness of 11-23 μm. The results were analyzed statistically to determine the effects of the additive on the properties of PP. The paper discusses the potential of PP Silica nanocomposite with a view to high voltage applications, especially power capac itors. © 2010 IEEE.
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2.
  • Takala, M., et al. (författare)
  • Effect of low amount of nanosilica on dielectric properties of polypropylene
  • 2010
  • Ingår i: Proceedings of the 2010 IEEE International Conference on Solid Dielectrics, ICSD 2010. - 9781424479443
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • This paper presents the results of the dielectric properties measurements conducted on Silica-Polypropylene (PP) nanocomposites. According to prior investigations by the authors silica nanoparticles have improved the performance of the dielectric material considering capacitor applications. Especially breakdown strengths with ac and dc voltages and resistance against surface degradation have increased. The relative permittivity and dielectric losses have also been comparable to reference PP. In this paper the results of the dielectric measurements conducted on composites with 1-2 wt-% silica are compared with reference PP. Silica dispersion in PP was confirmed with transmission electron microscopy (TEM). Weibull analysis was applied to the breakdown strength measurement results with dc voltage. Capacitance and loss factor measurements were conducted as a function of temperature to study thermal behavior. The measurements were conducted at the high voltage laboratories of Tampere University of Technology and Chalmers University of Technology. Statistical analysis was applied to the results to determine the significance of the differences between the materials. ©2010 IEEE.
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  • Resultat 1-2 av 2
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konferensbidrag (1)
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övrigt vetenskapligt/konstnärligt (1)
refereegranskat (1)
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Pettersson, M. (2)
Ranta, H (2)
Sonerud, Björn, 1979 (2)
Takala, M. (2)
Pelto, J. (2)
Kannus, K (2)
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Virtanen, S (1)
Ahonen, S (1)
Pakonen, P. (1)
Karttunen, M (1)
Navalainen, P. (1)
Koivu, V. (1)
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Chalmers tekniska högskola (2)
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2010 (2)

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