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局部放电下微水对SF6分解组分的形成及其影响规律

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Keywords: 局部放电,六氟化硫,组分分析,水分,分解组分

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Abstract:

H2O是影响SF6在局部放电下形成最终分解组分、组分含量及其产气速率等的重要因素之一,其影响机理及规律尚不完全清楚。本文利用研制的SF6局部放电分解试验平台,对不同H2O含量下SF6气体进行了48h局部放电分解试验,利用气相色谱检测得到了不同H2O含量的SF6在PD作用下所生成的各特征组分含量,并最终得到H2O对分解特性的影响规律。研究发现H2O含量的增加会抑制CF4的生成,CO2的生成量高于CF4,对SO2F2和SOF2的生成均有先促进后抑制的作用,且对SOF2的促进和抑制作用都强于SO2F2;当H2O含量较低时,随局部放电时间延长,SO2F2与SOF2的浓度比即φ(SO2F2)/φ(SOF2)逐渐减小,当H2O含量较高时,随局部放电时间的增加该比值逐渐增加。因此,利用SF6放电分解特征组分来诊断设备故障时必须考虑H2O的影响。

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