Effect of the field frequency during treeing tests in silicone polymers with different degree of crosslinking

L. I. KOVALEVSKI; L. M. SALVATIERRA; P. L. DAMMIG QUIÑA; I. M. IRURZUN; E. E. MOLA; N. CHALASHKANOV; S. J. DODD; L. A. DISSADO

Electrical Insulation and Dielectric Phenomena (CEIDP), 2015 IEEE Conference on

IEEE

Año: 2015; p. 613 - 616

Electrical treeing in silicone polymers has been investigated using a typical pin-plane geometry. The purpose of this work was to investigate the effect of ac field frequency upon the structure of treeing damage in a range of silicone dielectric materials. The liquid components were cured using different crosslinking ratios and hence both gels and elastomers were formed possessing a range of mechanical stiffness. These materials were characterized mechanically with an AR-G2 Rheometer. The results suggest that there is a clear dependence of the tree fractal dimension upon the applied ac voltage frequency and the sample´s microstructure as characterized by oscillating rheometry.