Correlation characteristics between gas pressure and SF6 decomposition under negative DC partial discharge
Correlation characteristics between gas pressure and SF6 decomposition under negative DC partial discharge
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负直流局部放电下气体压力与SF6分解的相关特性
DOI：
10.1049/iet-gtd.2016.1881
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发表时间：
2018
影响因子：
2.5
通讯作者：
Miao Yulong
中科院分区：
文献类型：
--
作者：
Tang Ju;Yang Dong;Zeng Fuping;Tang Bowen;Li Ke;Yao Qiang;Miao Yulong
为明确负直流气体绝缘系统（GIS）内部局部放电（PD）与气体压力的相关特性，建立基于分解成分分析的绝缘故障诊断方法，在构建SF6直流PD分解实验平台的基础上，对不同压力下SF6的PD分解进行了研究。采用不锈钢针-板电极模拟GIS中金属突起的绝缘缺陷。在不同的压力下，获得了SF6分解产生的SOF 2、SO2 F2、CO2、SO2和CF 4的数据。详细分析了组分浓度和有效特性比随压力的变化规律。此外，根据气体微电离理论推导出了压力和分解组分的数学公式。定义了有效含量和生成率来验证这种关系。结果表明，SF6分解组分浓度随压力的增加而逐渐降低，具有较强的规律性。由理论推导的压力与组分浓度的关系可以解释SF6分解组分的有效含量与有效生成速率和压力变化的关系。
Aimed to clarify the correlation characteristics between the internal partial discharge (PD) in the negative direct current (DC) gas‐insulated system (GIS) and gas pressure, and to establish an insulation fault diagnosis method based on decomposition component analysis, this study on PD decomposition of sulphur hexafluoride (SF6) was conducted under different pressures on the basis of constructing a SF6decomposition experimental platform under DC PD. A stainless steel needle‐plate electrode was used to simulate the insulation defects of metal protrusions in GIS. SOF2, SO2F2, CO2, SO2, and CF4data generated from SF6decomposition were obtained under different pressures. The variation law of component concentration and effective characteristic ratio with pressure were analysed in detail. In addition, a mathematical formula for pressure and decomposition components was deduced according to gas micro‐ionisation theory. The effective content and formation rate were defined to validate the relationship. Results show that the concentration of SF6decomposition components decreased gradually with increasing pressure with a strong regularity. Furthermore, the relationship between pressure and component concentration derived from the theory can explain the relationship between the effective content of SF6decomposition components and the effective formation rate and pressure variations.