基于光腔衰荡光谱法检测SF6/N2混合电气设备中特征组分H2S技术

H2S气体是SF6/N2混合电气设备潜伏性故障的特征分解组分之一。现有的现场技术均需标定,腔衰荡光谱法无需标定且能检测到低极限的H2S浓度。根据光腔衰荡光谱的检测原理,对激光器、光隔离器、低损耗光学腔、光电探测器等光路和电路器件进行选型和设计,配合软件设计、编程和数据处理完成了装置的研制,研制的光腔衰荡光谱法检测H2S装置无需光开关,对其进行定性定量试验,光谱图正确,H2S气体检测低限值达到1 μL/L,符合现场检测的需要,为现场检测技术奠定了基础。

Detection of Characteristic Component H2S in SF6/N2 Hybrid Electrical Equipment Based on Cavity Decay Spectroscopy

H2S gas is one of the characteristic decomposition components of latent faults in SF6/N2 hybrid electrical equipment. Existing field technologies require calibration, but cavity ring-down spectroscopy does not require calibration and can detect low-limit H2S concentrations. According to the detection principle of cavity ring-down spectroscopy, this paper selects and designs optical circuits and circuit devices such as lasers, optical isolators, low-loss optical cavities and photodetectors, and completes the device development with software design, programming and data processing. The developed H2S device does not require an optical switch to perform qualitative and quantitative tests. The spectrum is correct and the H2S gas detection has a low limit of 1 μL/L, which meets the needs of on-site inspection and lays a foundation for on-site detection technology.