Influence of oil aging on the formation and migration behavior of space charge in oil-paper insulation dielectrics

Abstract

Investigating the influence of oil aging or insulation paper aging on the formation and migration of space charge in oil-paper insulation dielectrics during its ageing process is helpful to provide the method to restrain the space charge formation. In this paper, the insulation oil was thermally aged at 130?? for up to 22 days and its ageing condition was identified. The space charge behavior of the oil-paper sample impregnated with oil aged for different times was investigated by the pulsed electro-acoustic (PEA) method. The space charge measurements were taken at various times during the stressing period of both voltage-on and voltage-off(short-circuit condition), as well as the decay process. The influence of oil ageing on the total charge amount, the surface trap energy density and the electric field distortion was analyzed. Results show that under the negative polarity power supply, the more
the deterioration of the oil, the larger the maximum charge
density of positive charge injected into the paper near to the anode and the negative charge accumulated at the paper-paper interface near to the anode. The total amount of charge, the surface trap energy density and the electric field distortion of the oil-paper sample increase with the oil aging degree.

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