Effects of Different Moisture Intrusion Directions on Insulation Performance of Resin Impregnated Paper Bushing Core

doi:10.3969/j.issn.1008-0198.2025.01.016

Abstract

Abstract: In order to study the effects of different moisture intrusion directions on the insulation performance of resin impregnated paper(RIP) bushing core, four types of test blocks with different directions of insulating varnish protection are prepared by utilizing real RIP bushing core, and the parameters such as dielectric loss factor(tanδ), capacitance, insulation resistance and frequency domain dielectric spectroscopy(FDS) of the blocks are measured at different humidity levels. The results show that tanδ, capacitance and insulation resistance have small and slow changes in light moisture, while they show cliff-like changes in heavy moisture, and tanδ and insulation resistance are more sensitive to moisture than capacitance.Due to the hindering effect of aluminum foil on moisture, the axial moisture of the RIP bushing core has a greater effect on the insulating performance than the radial moisture, and the difference becomes more significant with the increase of the degree of moisture. The results can provide a reference for the evaluation of moisture intrusion of RIP bushing.

Key words: moisture intrusion directions, RIP bushing core, insulation performance, frequency domain dielectric spectroscopy (FDS)

CLC Number:

TM853

ZHANG Cheng, CAI Guangyi, YOU Shaohua, XU Zuoming, LIU Taiwei. Effects of Different Moisture Intrusion Directions on Insulation Performance of Resin Impregnated Paper Bushing Core[J]. Hunan Electric Power, 2025, 45(1): 106-111.

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