Yang Hongda, Chen Qingguo, Wang Xinyu, Chi Minghe, Zhang Jinfeng
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China.
School of Electrical Engineering and Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Polymers (Basel). 2020 Sep 13;12(9):2080. doi: 10.3390/polym12092080.
High-voltage direct-current (HVDC) dry bushing capacitor-core insulation is composed of epoxy resin-impregnated insulating paper (RIP). To improve the thermal conductivity, breakdown strength, and space charge characteristics of RIP, 0.1 wt % nano-cellulose fiber (CNF)-modified RIP (CNF/RIP), 2.5-30 wt % hexagonal boron nitride (h-BN)-modified RIP (h-BN/RIP), and 2.5-30 wt % h-BN + 0.1 wt % CNF-modified RIP (h-BN + 0.1 wt % CNF/RIP) were prepared. Scanning electron microscopy (SEM) was implemented; the thermal conductivity, DC conductivity, DC breakdown strength, and space charge characteristics were tested. The maximum thermal conductivity of h-BN + 0.1 wt % CNF/RIP was 0.376 W/m.K with a h-BN content of 30 wt %. The thermal conductivity was 85.2% higher than that of unmodified RIP. The breakdown strength and charge suppression were the best in the case of 10 wt % h-BN + 0.1 wt % CNF/RIP. The maximum breakdown strength was 11.2% higher than that of unmodified RIP. These results can play a significant role in the research and development of insulation materials for HVDC dry bushing.
高压直流（HVDC）干式套管电容器芯绝缘由环氧树脂浸渍绝缘纸（RIP）组成。为提高RIP的热导率、击穿强度和空间电荷特性，制备了0.1 wt%纳米纤维素纤维（CNF）改性的RIP（CNF/RIP）、2.5 - 30 wt%六方氮化硼（h-BN）改性的RIP（h-BN/RIP）以及2.5 - 30 wt% h-BN + 0.1 wt% CNF改性的RIP（h-BN + 0.1 wt% CNF/RIP）。进行了扫描电子显微镜（SEM）分析；测试了热导率、直流电导率、直流击穿强度和空间电荷特性。h-BN含量为30 wt%时，h-BN + 0.1 wt% CNF/RIP的最大热导率为0.376 W/m·K。其热导率比未改性的RIP高85.2%。在10 wt% h-BN + 0.1 wt% CNF/RIP的情况下，击穿强度和电荷抑制效果最佳。最大击穿强度比未改性的RIP高11.2%。这些结果对高压直流干式套管绝缘材料的研发具有重要意义。
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