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Dielectric properties and partial discharge endurance of polypropylene-silica nanocomposite

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11 Author(s)
Takala, M. ; Tampere Univ. of Technol., Tampere, Finland ; Ranta, H. ; Nevalainen, P. ; Pakonen, P.
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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 capacitors.

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:17 ,  Issue: 4 )