Title :
Effect of filler on treeing phenomenon in epoxy resin under AC voltage
Author :
Nagao, M. ; Oda, K. ; Nishioka, K. ; Muramoto, Y. ; Hozumi, N.
Author_Institution :
Dept. of Electr. & Electron. Eng., Toyohashi Univ. of Technol., Japan
Abstract :
Epoxy resin is widely used as an insulation material in many electrical apparatuses because of its excellent electrical and manufactural characteristics. It is usually mixed with filler to improve mechanical and thermal characteristics. In order to quantitatively clarify the effect of fillers on the treeing phenomenon, treeing tests were preformed with epoxy specimens mixed with different kinds of fillers. Although tree initiation voltage decreased with introducing silica fillers, the fillers prevented the growth of the tree. The effect of filler shape was more significant on round-shape filler than on square-shape filler. Silane coupling treatment to the fillers did not bring a significant change in tree initiation voltage, however, brought a reduction in tree propagation. The change in tree propagation rate was explained by considering the field relaxation and energy dispersion due to branching at filler-resin interface. Tree propagation along the interface between resin and a quartz plate was observed and analyzed in order to ensure the above explanation
Keywords :
composite insulating materials; epoxy insulation; filled polymers; trees (electrical); AC voltage; SiO2; energy dispersion; epoxy resin; field relaxation; filler-resin interface; insulation material; quartz plate; silane coupling treatment; silica filler; tree initiation voltage; tree propagation rate; treeing phenomenon; Adhesives; Electrodes; Epoxy resins; Glass; Needles; Optical propagation; Silicon compounds; Trees - insulation; Tungsten; Voltage;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973744
