Dielectric properties and creepage discharge of epoxy/silica nanocomposite in mineral oil

This paper deals with the effect of the nano filler loading in epoxy resin (EP) on creepage discharge properties of the epoxy/silica nanocomposite (EP/S-NC) in mineral oil under standard lightning impulse voltage application using needle-bar electrode arrangement. Experimental results allow to estim...

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Bibliographic Details
Main Authors: Kurachi, Masaki, Kyunghoon Jang, Akahoshi, Takao, Kozako, Masahiro, Hikita, Masayuki
Format: Conference Proceeding
Language:English
Subjects:
Composite insulation system
Creepage discharge
Dielectric property
Dielectrics
Discharges (electric)
Epoxy/silica composite
Lightning impulse voltage
Loading
Oils
Partial discharges
Silicon compounds
Surface discharges
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Summary:This paper deals with the effect of the nano filler loading in epoxy resin (EP) on creepage discharge properties of the epoxy/silica nanocomposite (EP/S-NC) in mineral oil under standard lightning impulse voltage application using needle-bar electrode arrangement. Experimental results allow to estimate discharge occurrence probability (P d ) at each voltage level. The relative permittivity ε' r . and dielectric loss are measured at 50 Hz-5 MHz for EP/S-NC with a good dispersion of nanoparticles in the base epoxy matrix. As a result, it is found that P d decreases with increasing the filler loading up to 1 wt%, and then increases. Namely, the nano filler content of 1 wt% produces the best insulation performance in terms of Pd. The relative permittivity of the composite decreases with decreasing the filler loading below 1 wt%, while further increasing nano silica filler loading results in increased ε' r above 3 wt%.
ISSN:2153-3733
DOI:10.1109/ICDL.2017.8124663