SF_6分解产物的红外光谱特性与放电趋势

Infrared Spectrum Characteristic and Discharge Trend of SF_6 Decomposition Products

SF6分解组分与GIS的绝缘缺陷密切相关,通过气体组分的监测可对GIS内绝缘状态做出评估。为此,利用傅立叶变换红外吸收光谱法(FTIR)和气相色谱法(GC)对SF6局部放电分解组分进行了检测分析,每12 h检测一次,共放电96 h。成功检测到了SOF2、SO2F2、SO2、SOF4、SF4等气体,且在不同的时段检测到了不同的组分种类和体积分数变化趋势,FTIR可检测的组分种类比GC多。利用各吸收峰的吸光度值做初步的定量分析,发现不同的放电时间有不同的气体组分和产气率,该方法能够实现GIS的在线监测。

A close relationship is existed between SF6 decomposition components and the insulation defect in GIS, which can be evaluated by monitoring the internal gas decomposition components. Fourier transform infrared spec. troscopy （FTIR） and gas chromatography （GC） were used to detect the SF6 partial discharge decomposition products. The sample interval was 12 hours, total discharge time was 96 hours. It＇s found that the components are varied with discharge time. these gases are detected by FTIR , such as SOF2 ,SO2 F2 ,SO2 ,SOF4 ,SF4, the gas species are more than that of GC. Then, Quantitative analysis was taken with the absorbance value of each absorption peak. The author found that there are different components and gas formation rates with different discharge time, so this method can be used for reabtime online monitoring.