Dual suppression on the vacuum surface flashover from composite surface modification
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摘要: 为提升绝缘材料真空沿面耐压，提出了一种由微槽与分子自组装膜结合的复合结构，并采用激光微刻蚀、超声清洗、分子自组装等方法，在氧化铝真空绝缘子表面制备了该表面复合结构。作为对比，同时制备了仅有微槽或分子自组装膜的绝缘子。二次电子发射系数测试结果表明，表面微槽结构和表面分子自组装膜都可以降低绝缘子的二次电子发射系数，而他们相结合形成的复合结构能够进一步降低绝缘子的二次电子发射系数；相应的，闪络电压测试结果表明表面微槽结构和表面分子自组装膜都可以提升绝缘子的真空沿面闪络电压，而两者相结合形成的复合结构能够进一步提升闪络电压。该结果证明了复合结构中分子自组装膜和微槽能够对真空沿面闪络的发展进行双重抑制。Abstract: To improve the vacuum surface flashover of insulators, in this paper, a kind of composite surface structure consisting of micro grooves and molecule self-assembly membrane was proposed and prepared on the surface of alumina vacuum insulators by laser carving, water cleaning and molecule self-assembly. Meanwhile, insulators with only micro grooves or pure molecule membrane were also prepared. Secondary electron emission yield test shows that both the micro groove construction and molecule self-assembly can decrease the secondary electron emission yield of the alumina insulator. Their combination the composite surface structure can further decrease the secondary electron emission yield. Correspondingly, surface flashover voltage test indicated that surface micro groove construction and molecule self-assembly could both improve the surface flashover voltages and their combination could further improve the flashover voltages. The results demonstrate that molecule membrane and the micro grooves in the composite structure can form dual suppression to the development of the vacuum flashover.
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图 1 复合绝缘子的结构及其制备过程示意图
Figure 1. Schematic of the composite surface structure and its preparation flow chart
(a) Composite surface structure. (b) Illustration of the formation of molecule self-assembly membrane. (c) Preparation flow chart.
图 2 绝缘子的SEM、EDS与水接触角测试结果
Figure 2. SEM, EDS and water contact test results of the insulators
(a) Original alumina. (b) Grooved alumina. (c) Composite insulator. (d) EDS of original alumina. (e) EDS of grooved alumina. (f) EDS of composite insulator. (g) Water contact test of grooved alumina insulator. (h) Water contact test of composite alumina insulator.
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