摘要
金属材料的化学活性会直接影响SF6在局部放电作用下的分解过程,掌握其影响规律是建立基于SF6分解特性的故障诊断方法必须解决的关键问题之一。为此,利用铝、铜和不锈钢3种金属材质的针电极与不锈钢板电极构成常见的金属突出物绝缘缺陷模型,在建立的SF6放电分解试验平台上进行了96 h局部放电分解试验,采用气相色谱法测定了CF4、CO2、SO2F2和SOF2主要分解特征组分。结果包括:金属电极材料对CO2的生成几乎没有影响,但对SO2F2和SOF2的生成速率有较大影响。分析认为主要原因在于化学活性越强的金属材料与SF6分解产生的低氟硫化物及氟原子发生反应的速率越高,产生的SF2和SF4越多,进而促使生成更多的SO2F2和SOF2。因此,在利用SF6分解特性对气体绝缘设备进行绝缘状态监测及故障诊断时,必须综合考虑故障点金属材料的差异对其造成的影响。
The chemical activity of metal directly influences the decomposition of SF6 under partial discharge （PD）, hence obtaining the regularity of this influence becomes a key issue for establishing fault diagnosis methods based on SF6 de- composition. Therefore, we built common protrusion defect models using needle electrodes of different materials （aluminum, copper and stainless steel） and plate electrodes of stainless steel to comprise a SF6 decomposition test plat- form, and then performed serial experiments of 96-hour PD decomposition on the plat form. In the experiments, we utilized gas chromatograph to quantitatively analyze the main decomposed components such as CF4, CO2, 502F2, and SOF2. The results show that the tested electrode materials hardly affect the formation of CO2, but greatly affect the gener- ation of SO2F2 and SOF2, and the reason is that the formation of low-fluorine sulphides and fluorine atoms produced by SF6 decomposition increase with increasing chemical activity of the metals. The electrode materials with higher chemical activity will have more obvious promotion effects, by which more SF2 and SF4 are generated, further reacting to form SOF2 and SO2F2. Hence, the difference of electrode materials at fault locations should be seriously taken into account in GIS insulation status diagnoses using SF6 decomposition characteristics.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第1期100-105,共6页
High Voltage Engineering
基金
国家自然科学基金(51377181)
重庆市自然科学基金重点项目(cstc2013jjb90002)~~
关键词
SF6
电极材料
局部放电
特诊组份
气相色谱法
分解组分
SF6
electrode material
partial discharge
characteristic component
gas chromatography
decomposition components
