Decomposition Characteristics of SF6 under Thermal Fault for Temperatures below 400 °C
Decomposition Characteristics of SF6 under Thermal Fault for Temperatures below 400 °C
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DOI：
10.1109/tdei.2014.6832242
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发表时间：
2014-06-01
影响因子：
3.1
通讯作者：
He, Jianjun
中科院分区：
文献类型：
--
作者：
Zeng, Fuping;Tang, Ju;He, Jianjun
探讨SF6气体在热故障下的分解特性，进一步完善利用SF6气体分解成分诊断SF6绝缘设备内绝缘状态的方法。为此，设计了SF6电气设备热故障模拟系统，并进行了一系列的实验研究。它最初在温度低于400摄氏度时具有SF6热分解特性。分析了SF6气体热分解的组分种类及其生成规律，确定了SF6气体热分解的主要特征组分，并选择了表征故障严重程度的关键组分。结果表明：SF6在300 ℃时开始明显分解，主要分解组分为CO2、SO2 F2、SOF 2、SOF 4、SO2和H2S;故障温度的提高会促进SF6的分解，但各分解组分的形成规律不同; H2S是热故障进行到一定程度（360 ℃以上）时才出现的特殊组分。因此，可以利用分解后的组分及其形成规律对SF6设备热故障进行诊断。H2S可作为表征故障严重性的关键组分。
This paper aims to explore the decomposition characteristics of SF6 under thermal fault, which can further improve the method of using SF6 decomposed components to diagnose inner insulation status of SF6 insulated equipment. Hence, the thermal fault simulation system of SF6 electrical equipment is designed and serials of experiments are conducted. It initially gets SF6 thermal decomposition characteristic for temperature below 400 degrees C. Then it analyzes decomposed component species and their generation regularity, determines the main characteristic component of SF6 thermal decomposition and chooses the key component to represent fault severity. The result shows that: SF6 begins to decompose obviously at 300 degrees C and the main decomposition components contain CO2, SO2F2, SOF2, SOF4, SO2 and H2S; the improvement of fault temperature will promote the decomposition of SF6, but the formation regularity of each decomposed component is different; H2S is the special component only appears when thermal fault proceeds to some degree (above 360 degrees C). Hence, decomposed components and their formation regularity can be used to diagnose the SF6 equipment thermal fault. H2S can be used as the key component to represent fault severity.