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CF3I/CO2与CF3I/N2两种混合气体局部放电绝缘特性的试验研究

DOI: 10.13334/j.0258-8013.pcsee.2014.12.015, PP. 1948-1956

Keywords: CF3I混合气体,液化温度,局部放电起始电压,温室效应,协同效应

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Abstract:

近年来,寻找SF6替代气体的研究工作成为各国科学家和电力部门需要解决的迫切问题。从局部放电绝缘特性角度出发,对CF3I/CO2与CF3I/N2两种混合气体在不同气压、混合比和间距下的局部放电起始电压(工频负半周局放起始电压(negativepartialdischargeinceptionvoltage,PDIV-)和正半周局放起始电压(positivepartialdischargeinceptionvoltage,PDIV+))进行测量和比较,同时对两种混合气体的PDIV-和PDIV+值随混合比变化的协同效应进行计算和对比分析。试验结果表明:相同试验条件下CF3I/CO2混合气体的PDIV-值和PDIV+值分别约为CF3I/N2混合气体的1.2倍和1.0~1.4倍,且CF3I/CO2混合气体PDIV-和PDIV+值随混合比变化的协同效应也均明显优于CF3I/N2混合气体。故综合考虑温室效应潜在值(globalwarmingpotential,GWP)、液化温度以及局部放电绝缘特性等因素,在特定环境下,混合比为25~30%的CF3I/CO2混合气体较CF3I/N2混合气体更适合被考虑作为SF6气体的绝缘替代物用于低中压电气设备中。

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