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.
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机译：环氧树脂浸渍的绝缘纸（RIP）复合材料在超高压直流（UHVDC）输电系统中用作干式电容器套管的内部绝缘。为了提高RIP的介电性能和导热性，在将纯环氧树脂浸渍之前，将六方氮化硼（h-BN）纳米薄片以0–50 wt％的浓度添加到绝缘纸中。 X射线衍射（XRD），扫描电子显微镜（SEM）观察，热导率以及直流电（DC）体积电导率的典型介电特性。获得了直流击穿强度和空间电荷特性。纳米h-BN改性的热导率最大值达到0.478 W /（m·K），与未改性的RIP相比提高了139％。纳米h-BN改性的RIP的直流击穿电场强度不会降低很多。纳米h-BN改性的电导率对温度不太敏感。同样，当含量为50重量％时，空间电荷被抑制。因此，纳米h-BN改性的RIP在实际的干式DC套管应用中可能很有用。
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