Abstract
Epoxy resin-impregnated insulation paper (RIP) composites are used as the inner insulation of dry condenser bushing in the ultra-high voltage direct current (UHVDC) power transmission system. To improve the dielectric properties and heat conductivity of RIP, hexagonal boron nitride (h-BN) nano-flakes are added to the insulation paper at concentrations of 0–50 wt % before impregnation with pure epoxy resin. X-ray diffraction (XRD), scanning electron microscopy (SEM) observations, thermal conductivity as well as the typical dielectric properties of direct current (DC) volume conductivity. DC breakdown strength and space charge characteristics were obtained. The maximum of nano-h-BN modified heat conductivity reach 0.478 W/(m·K), increased by 139% compared with unmodified RIP. The DC breakdown electric field strength of the nano-h-BN modified RIP does not reduce much. The conductivity of nano-h-BN modified is less sensitive to temperature. As well, the space charge is suppressed when the content is 50 wt %. Therefore, the nano-h-BN modified RIP is potentially useful in practical dry DC bushing application.
Highlights
As people0 s demand for electricity grows, transmission systems are moving toward high-capacity and high-voltage
The nano-hexagonal boron nitride (h-BN) modified resin-impregnated insulation paper (RIP) is potentially useful in practical dry direct current (DC) bushing application
Reduce the influence of space charge on the internal electric field distribution of RIP; the other is to reduce the dependence of RIP conductivity on temperature and improve thermal conductivity of RIP
Summary
As people0 s demand for electricity grows, transmission systems are moving toward high-capacity and high-voltage. The aging of insulation under high electric field intensity for a long time will accelerate, which seriously affects the safe and stable operation of the bushing. Reduce the influence of space charge on the internal electric field distribution of RIP; the other is to reduce the dependence of RIP conductivity on temperature and improve thermal conductivity of RIP. The epoxy resin with high viscosity is harmful to the impregnation of insulating paper, which affects the insulation performance of RIP. Nano-h-BN modified insulating paper impregnated with unmodified epoxy resin was used to test its thermal conductivity, DC conductivity, DC breakdown field strength and space charge characteristics. The results show that the nano-h-BN modified RIP has excellent thermal conductivity, space charge suppression and less temperature dependence than unmodified RIP
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