Abstract In the present days, the establishment of supporting insulators plays a vital role in the continuous operation of three-phase gas-insulated busduct (GIB) which mainly depends on the distribution of electric field stress on the surface of the spacer. The triple junction (TJ's) which is one of the regions where the electric field stress has to be minimized. The insulator failures of GIB are observed due to several defects like delamination, protrusion etc. These defects affect the electric field distribution badly over the spacer length, hence de-energies the complete GIB leading to huge loss economically. In this paper, for a three-phase GIB under delamination, a post-type spacer with Functionally Graded Material (FGM) was designed to reduce the high electrical field stress at TJ's by inserting metal inserts at the enclosure end. Functionally graded materials are distributed spatially with several filler materials by doping them with different permittivity values to obtain uniform electric field stress. Simulation is performed and the electrical field stress is calculated by varying the dimensions of delamination for different operating voltages at different sizes and FGM gradations with different permittivity ranges, the results obtained are presented and analysed.

中文翻译：

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分层下三相共封闭气体绝缘母线槽中FGM柱式间隔器的设计与分析

摘要 目前，支撑绝缘子的设置对三相气体绝缘母线槽（GIB）的连续运行起着至关重要的作用，其主要依赖于间隔件表面电场应力的分布。三结 (TJ) 是必须最小化电场应力的区域之一。由于分层、突出等多种缺陷，观察到 GIB 的绝缘体失效。这些缺陷严重影响隔板长度上的电场分布，因此使整个 GIB 断电，从而导致巨大的经济损失。在本文中，对于分层下的三相 GIB，设计了一种具有功能梯度材料 (FGM) 的柱式隔板，通过在外壳末端插入金属插件来降低 TJ 处的高电场应力。功能梯度材料在空间上分布有几种填充材料，通过将它们掺杂不同的介电常数值来获得均匀的电场应力。执行仿真并通过改变不同工作电压、不同尺寸和不同介电常数范围的 FGM 等级的分层尺寸来计算电场应力，并呈现和分析所获得的结果。