基于CRDS的SF_6电气设备分解产物检测技术

针对现有SF_6分解产物检测方法如检测管法、气相色谱法、质谱法以及电化学法等存在信号交叉干扰、精度不高、难以实现在线监测的缺点,提出了基于光腔衰荡光谱(cavity ring-down spectroscopy,CRDS)的SF_6电气设备分解产物检测技术。通过给出SF_6电气设备内部故障时SF_6分解产物的产生机理,分析了SF_6绝缘电气设备特征分解产物,结合CRDS技术原理,进行了特征分解产物的吸收谱线研究,选择了SF_6特征分解产物吸收谱线。此外,采用模块化设计方法,设计了基于CRDS技术的SF_6电气设备分解产物在线监测系统,分析了系统设计中的关键技术,包括光腔匹配技术和抗干扰技术,以提高检测精确度和可靠性。

CRDS Based SF6 Decomposition Detection Technology for SF6 Electrical Equipment

Many decomposition detection methods of SF6 decomposition, such as detector tube, gas chromatography, mass spectrometry, and electrochemical method have some shortcomings, for instance, signal overlapp, poor accuracy or reliability, and not being able to realize SF6 decomposition on line monitoring. Cavity ring down spectroscopy (CRDS) technique is proposed to monitor SF6 decomposition. By studying the SF6 decomposition mechanism in electrical equipment, the characteristic decomposition products and the corresponding absorption spectrum are analyzed and chosen in terms of CRDS technique. Based on CRDS, an on line monitoring system of SF6 decomposition in SF6 electrical equipment is designed by modular method, and key technologies to improve the accuracy and reliability are explained in details, including cavity matching and anti jamming technique.