To suppress the charge accumulation on the spacer surface in direct current (DC) gas insulated transmission line (GIL) is an important and emergent issue for the development of a clean, safe and economic smart grid. A design method of the DC spacer is proposed, and a spacer prototype is prepared and evaluated both by simulation and type test. The DC withstand voltage test and polarity reversal test are performed using the new DC spacer compared with a commercialised 220 kV AC spacer. The simulation results indicate that the surface electric field and surface charge of the DC spacer are lower than those of the alternating current (AC) spacer under DC voltage. The test results verify that the surface flashover voltage of this DC spacer is higher than that of the AC spacer. The potential feasibility of the spacer design for HVDC is discussed. It is hoped that the content of this paper can bring new ideas in the development of HVDC gas insulated equipment.

中文翻译：

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设计 HVDC GIS/GIL 隔板以抑制电荷积累

抑制直流（DC）气体绝缘输电线路（GIL）中间隔层表面的电荷积累是发展清洁、安全、经济的智能电网的重要而紧迫的问题。提出了一种直流隔板的设计方法，并通过仿真和型式试验制作了隔板样机并进行了评估。直流耐压测试和极性反转测试是使用新的直流隔板与商业化的 220 kV 交流隔板进行比较。仿真结果表明，直流隔板的表面电场和表面电荷低于交流（AC）隔板在直流电压下的表面电场和表面电荷。测试结果证实，该直流隔板的表面闪络电压高于交流隔板的表面闪络电压。讨论了 HVDC 隔板设计的潜在可行性。