Details

Autor(en) / Beteiligte

• Hu, Jin
• Wan, Fu
• Chen, Weigen
• Mao, Hangyin
• Wang, Pinyi
• Wang, Jianxin
• Zhou, Feng
• Zhu, Chengzhi

Titel

Detecting SO2 and CF4 under high concentration SF6 Using V-shaped Cavity Enhanced Raman Spectroscopy

Ist Teil von

• 2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2020, p.1-4

Ort / Verlag

IEEE

Erscheinungsjahr

2020

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• As an important and widely used electrical equipment, GIS (gas insulated switchgear) greatly affects the stability and safety of the entire power grid. By detecting the concentration of SF 6 decomposed component gases in GIS, we can judge the faults existing in the GIS, and prevent the corrosive decomposed gases from damaging the insulation. However, existing SF 6 decomposition component detection methods can are difficult to achieve relatively accurate simultaneous detection of multi-component gases. In this paper, a method using cavity enhanced Raman spectroscopy was developed to simultaneously detect SO 2 and CF 4 under high concentration SF 6 . Based on frequency-locking cavity enhancement technology, we coupled laser light with a wavelength of 642 nm and a power of about 50 mW into a V-shaped resonant cavity, and realized three orders of power enhancement. Due to the special V-shaped structure of the resonant cavity, the direct reflected light from the cavity mirror will not feedback to the laser, thereby avoiding false locking. Under 1 atmosphere pressure, Raman spectroscopy of CF 4 and SO 2 with a concentration of 1% was obtained. The characteristic Raman spectral lines of CF 4 and SO 2 were determined as 909 cm −1 and 1151 cm −1 , respectively. responding to their v1 transition. And the Raman spectrum of CF 4 and SO 2 under the pressure of gradient distribution was obtained, it was found that the Raman characteristic peak intensity of CF 4 and SO 2 was highly linear between pressure relationship. Besides, the mixed gas of CF 4 and SO 2 under high concentration SF 6 was detected simultaneously without any interference. This study laid the foundation for Raman spectroscopy for the detection and quantitative analysis of SF 6 decomposed gas components, indicating that Raman spectroscopy has great potential in the field of SF 6 decomposed gas component detection.