SF6/N2混合气体绝缘特性实验研究

Research on Insulation Characteristics of SF6/N2 Gas Mixture

摘要:

通过安托万方程和拉乌尔定律，研究了不同混合方案下SF6/N2混合气体的液化温度，结合混合气体全球变暖潜能值（GWP）研究结果，分析混合气体的理化特性。文中搭建混合气体绝缘特性试验平台，测试不同混合方案下SF6/N2混合气体的工频击穿电压和直流击穿电压，分析了混合气体中SF6含量对混合气体绝缘性能和理化性能的影响规律。研究表明，在气压为0.5MPa、SF6含量为30%时，液化温度为-59.8℃，比纯SF6气体下降了30℃，GWP下降了31%，混合气体的绝缘性能基本达到相同压强下纯SF6的80%，在一些严寒地区可替代纯SF6气体在气体绝缘输电线路（GIL）中使用。

Abstract:

Based on Antoine equation and Raoult′s law, the liquefaction temperature of SF6/N2 gas mixture [JP]under different mixing schemes is studied, and combined with the research results of global warming potential (GWP) of the gas mixture, its physical and chemical properties are analyzed. The power frequency breakdown voltage and DC breakdown voltage of SF6/N2 gas mixture under different mixing schemes are tested, and the influence of SF6 content on the insulation performance and physicochemical properties of SF6/N2 gas mixture is analyzed. The results show that when the gas pressure is 0.5 MPa and SF6 accounts for 30%, the liquefaction temperature is -59.8 ℃,[JP] GWP decreases by 30%, and the insulation performance of the mixed gas reaches 80% of pure SF6 under the same pressure. In some cold regions, it can replace pure SF6 in gas insulated line (GIL).