Charge trap characteristics of epoxy spacer insulating material due to surface flashover are important for improving the stable operation of GIS. In this work, magnesium oxide (MgO) filled epoxy nanocomposite material is proposed as the spacer material and its performance is compared with pure epoxy. The surface properties of spacer materials were altered using surface flashovers generated due to standard lightning impulse (LI) and steep fronted lightning impulse (SFLI) having front time of 0.1 µs, using rod plane electrode setup. The impact of surface flashovers on charge trap characteristics were analysed through surface and space charge studies. The surface charge behaviour was estimated by surface potential decay and their trap characteristics, space charge accumulation was measured using pulsed electro acoustic technique. SFLI flashover voltage was lower compared to LI voltages and MgO filled epoxy nanocomposite had higher flashover voltage compared to pure epoxy. The space charge density of MgO filled epoxy nanocomposite was less compared to pure epoxy after treating with LI/SFLI flashover voltages. MgO filled epoxy nanocomposite had enhanced surface potential decay and reduced trap energy after surface flashover. Due to the superior insulating properties, MgO filled epoxy nanocomposite can be used as the spacer material in GIS components.

环氧隔离绝缘材料表面闪络引起的电荷陷阱特性对于提高GIS的稳定运行具有重要意义。在这项工作中，氧化镁 (MgO) 填充的环氧树脂纳米复合材料被提议作为间隔材料，并将其性能与纯环氧树脂进行比较。使用杆平面电极设置，使用由标准雷电脉冲 (LI) 和前缘时间为 0.1 µs 的陡锋雷电脉冲 (SFLI) 产生的表面闪络来改变间隔材料的表面特性。通过表面和空间电荷研究分析了表面闪络对电荷陷阱特性的影响。表面电荷行为通过表面电位衰减和它们的陷阱特性来估计，空间电荷积累是使用脉冲电声技术测量的。与 LI 电压相比，SFLI 闪络电压较低，与纯环氧树脂相比，MgO 填充的环氧树脂纳米复合材料具有较高的闪络电压。在用 LI/SFLI 闪络电压处理后，MgO 填充的环氧树脂纳米复合材料的空间电荷密度低于纯环氧树脂。氧化镁填充的环氧纳米复合材料在表面闪络后具有增强的表面电位衰减和降低的陷阱能。由于具有优异的绝缘性能，MgO 填充的环氧纳米复合材料可用作 GIS 组件中的间隔材料。氧化镁填充的环氧纳米复合材料在表面闪络后具有增强的表面电位衰减和降低的陷阱能。由于具有优异的绝缘性能，MgO 填充的环氧纳米复合材料可用作 GIS 组件中的间隔材料。氧化镁填充的环氧纳米复合材料在表面闪络后具有增强的表面电位衰减和降低的陷阱能。由于具有优异的绝缘性能，MgO 填充的环氧纳米复合材料可用作 GIS 组件中的间隔材料。