SF_6分解组分的红外光谱定量测定

SF_6 Decomposition Components IR Measurement and Quantify

SF6发生局部放电时会生成一定的稳定特征分解组分,利用这些特征组分可以监测GIS内部绝缘状态。分别采用SF6气体与高纯氮气作为红外检测背景气体获取SF6分解组分的光谱图进行了比较,选取SF6作为红外检测背景气体。测量了SOF2、SO2F2、SO2、CO标准气体的红外吸收光谱图,选取了其最优吸收峰,计算了最优峰处的吸光系数。对局部放电试验装置进行了放电量标定,在5个局部放电量下进行多组红外检测,结果表明存在临界放电量,不同放电时间和放电量下各组分产气率不同。SOF2、SO2F2的产气率随放电量及放电时间变化较有规律,可以用产气率反演局部放电程度;SO2和CO产气率变化复杂,但其变化趋势同样可以用于表征内部绝缘状态。

SF_6 partial discharge can generate stable decomposition components,which can be used to monitor the inner insulation in GIS.We compared the infrared spectrum（IR） by taking the pure SF_6 and N_2 as background gas and selecting the former for the IR detection background gas,obtained standard spectra and optimum absorption peaks of SOF_2,SO_2F_2,SO_2,CO,and calculated the absorption coefficients of the optimum absorption peaks.IR spectra were detected under five different partial discharge magnitudes after calibrating the partial discharge test device.It is found that there is critical partial discharge magnitude,there are different gas production rates with different discharge time and discharge magnitude.SOF_2,SO_2F_2＇ gas production rates have rules with different discharge magnitude,which can diagnosed partial discharge level in GIS;moreover,the variation of SO_2,CO＇ gas production rates is complex,but the single varying trend can still indicate the inner insulation condition.