Abstract
Vegetable oil is considered as the alternation of traditional mineral oil serving as the insulation medium due to the considerable dielectric property and the excellent biodegradation. In this paper, thermal step method (TSM) was applied to analyze the space charge distribution in the insulating vegetable oil reinforced with BN nanoparticles. BN nanoparticles with different mass fractions were dispersed in the origin oil and the space charge distribution was obtained after the sample was short circuited. DC voltages with various magnitudes and times was applied in charging process and showed obvious influence on the charge accumulation. Results showed that the charge density was reduced in the oil filled with BN nanoparticles as the consequence of the alternation in trap depth and the corresponding charge transportation and dissipation.
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